FNUS55 KRIW 181035 FWFRIW Fire Weather Planning Forecast for Western and Central Wyoming National Weather Service Riverton WY 435 AM MDT Mon May 18 2026 .DISCUSSION... ...Yellowstone NP and Teton dispatch areas (includes fire weather zones 140...414...415...and 416)... Snow chances will be decreasing from west to east through the morning. Northeast winds, with gusts of 25 to 35 mph, will occur through the morning and decrease after midday with gusts of 15 to 20 mph expected into the evening. Dry and warming conditions expected Tuesday and Wednesday with another cold front expected on Thursday. ...Cody dispatch area (includes fire weather zones 275...276... 282...283...285...286...287...288...and 289)... ***WINTER STORM WARNING IN EFFECT FOR ZONES 288 AND 289 UNTIL 6 PM MDT THIS EVENING*** ***WINTER WEATHER ADVISORY IN EFFECT FOR ZONES 276, 282, 283, 285 AND 286 UNTIL 6 PM MDT THIS EVENING*** Snow and wind will continue this morning, with snow ending between 1200 and 1500. Wind gusts of 25 to 35 mph will occur through the morning, quickly decreasing after 1200. Gusts up to 30 mph will continue in the afternoon in zone 275. Dry and warming conditions expected Tuesday and Wednesday with another cold front expected on Thursday. ...Casper dispatch area (includes fire weather zones 277...278... 279...280...281...285...289...and 300)... ***WINTER STORM WARNING IN EFFECT FOR ZONES 279, 280, 289 AND 300 UNTIL 6 PM MDT THIS EVENING*** ***WINTER WEATHER ADVISORY IN EFFECT FOR ZONES 277, 278, 281, 285 AND 286 UNTIL 6 PM MDT THIS EVENING*** Snow and wind will continue this morning, with snow ending between 1200 and 1500. Wind gusts of 25 to 35 mph will occur for most areas through the morning, with gusts of 60 to 70 mph expected over zone 279 and portions of zone 289 west of the Divide. Winds will decrease after 1200, with gusts of 30 to 45 mph continuing over zone 279 through the afternoon. Dry and warming conditions expected Tuesday and Wednesday with another cold front expected on Thursday. ...Thunderstorms imply strong gusty and erratic winds... WYZ280-191245- Natrona County/Casper BLM- Including the cities of Casper and Midwest 435 AM MDT Mon May 18 2026 ...WINTER STORM WARNING IN EFFECT UNTIL 6 PM MDT THIS EVENING... .TODAY... Sky/weather.........Cloudy. Patchy blowing snow in the morning. Patchy blowing snow early in the afternoon. Snow showers through the day. Slight chance of showers and thunderstorms in the afternoon. Snow accumulation of 2 to 6 inches. Chance of precipitation near 100 percent. Chance of thunder...10 percent. Max temperature.....33-38. 24 hr trend......21 degrees cooler. Min humidity........78-84 percent. 24 hr trend......35 percent wetter. 20-foot winds.......Breezy. North winds 20 to 25 mph until 1500, then around 15 mph. Gusts up to 35 mph. Ridge top winds.....Northeast around 30 mph until 1200, then north around 20 mph. Chc of wetting rain.85 percent until 1200, then 30 percent. Transport winds.....Northeast 25 to 30 mph. Mixing Height.......1200-2800 ft agl. Smoke dispersal.....Fair to good. .TONIGHT... Sky/weather.........Mostly cloudy then becoming partly cloudy. Patchy fog early in the evening. Chance of snow showers and showers in the evening. Chance of precipitation 50 percent. Chance of thunder...0 percent. Min temperature.....23-28. 24 hr trend......3 degrees cooler. Max humidity........89-95 percent. 24 hr trend......5 percent drier. Humidity recovery...Excellent. 20-foot winds.......Northeast winds around 10 mph until 2100, then downslope/downvalley 4-7 mph. Gusts up to 15 mph. Ridge top winds.....North around 10 mph until 2400, then southwest. Chc of wetting rain.Zero percent. Transport winds.....North around 10 mph until 2400, then west. Mixing Height.......800-2800 ft agl until 2400, then 400-800 ft agl. Smoke dispersal.....Poor. .TUESDAY... Sky/weather.........Partly cloudy then becoming mostly sunny. Chance of thunder...0 percent. Max temperature.....43-48. 24 hr trend......11 degrees warmer. Min humidity........49-55 percent. 24 hr trend......31 percent drier. 20-foot winds.......Upslope/upvalley 5-9 mph until 0900, then southwest around 10 mph. Gusts up to 15 mph. Ridge top winds.....Southwest 10 to 15 mph. Chc of wetting rain.Zero percent. Transport winds.....West 10 to 15 mph. Mixing Height.......1600-3600 ft agl. Smoke dispersal.....Poor to fair. .Forecast days 3 through 7...... .TUESDAY NIGHT...Mostly clear. Lows in the mid 20s. Southwest winds around 10 mph. .WEDNESDAY...Warmer. Mostly clear. Lows in the mid 30s. Highs in the upper 50s. Southwest winds around 10 mph. .THURSDAY...Partly cloudy with chance of showers and slight chance of thunderstorms. Lows in the mid 30s. Highs in the upper 50s. Northwest winds around 10 mph. .FRIDAY...Partly cloudy with slight chance of showers and thunderstorms. Lows in the upper 30s. Highs in the lower 60s. Winds generally less than 10 mph. .SATURDAY THROUGH SUNDAY...Mostly clear. Lows in the lower 40s. Highs 71 to 76. $$ WYZ283-191245- Upper Wind River Basin/Wind River Basin- Including the cities of Crowheart, Lander, Riverton, and Shoshoni 435 AM MDT Mon May 18 2026 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 6 PM MDT THIS EVENING... .TODAY... Sky/weather.........Cloudy. Patchy blowing snow early in the morning. Patchy blowing snow late in the morning. Snow showers in the morning, then chance of snow showers, showers and slight chance of thunderstorms in the afternoon. Snow accumulation up to 6 inches. Chance of precipitation near 100 percent. Chance of thunder...10 percent. Max temperature.....36-41. 24 hr trend......15 degrees cooler. Min humidity........64-70 percent. 24 hr trend......24 percent wetter. 20-foot winds.......North winds 15 to 20 mph until 1500, then around 10 mph. Gusts up to 40 mph. Ridge top winds.....North 20 to 25 mph. Chc of wetting rain.65 percent until 1200, then 10 percent. Transport winds.....North 20 to 25 mph. Mixing Height.......1800-3800 ft agl. Smoke dispersal.....Fair to good. .TONIGHT... Sky/weather.........Mostly cloudy then becoming partly cloudy. Patchy fog early in the evening. Patchy fog late in the evening. Slight chance of showers early in the evening. Slight chance of snow showers in the evening. Chance of precipitation 20 percent. Chance of thunder...0 percent. Min temperature.....24-29. 24 hr trend......3 degrees cooler. Max humidity........79-85 percent. 24 hr trend......5 percent drier. Humidity recovery...Excellent. 20-foot winds.......Northeast winds around 10 mph and gusty until 2100, then downslope/downvalley 4-7 mph. Ridge top winds.....Northeast around 10 mph until 2400, then southwest. Chc of wetting rain.Zero percent. Transport winds.....Northeast around 10 mph until 2400, then southwest. Mixing Height.......1400-3400 ft agl until 2400, then 400-600 ft agl. Smoke dispersal.....Poor. .TUESDAY... Sky/weather.........Partly cloudy then becoming mostly sunny. Chance of thunder...0 percent. Max temperature.....46-51. 24 hr trend......11 degrees warmer. Min humidity........46-52 percent. 24 hr trend......19 percent drier. 20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then south around 10 mph with higher gusts. Ridge top winds.....South 10 to 15 mph. Chc of wetting rain.Zero percent. Transport winds.....Southwest 10 to 15 mph. Mixing Height.......1000-3000 ft agl until 1200, then 3400-5400 ft agl. Smoke dispersal.....Poor to fair. .Forecast days 3 through 7...... .TUESDAY NIGHT...Mostly clear. Lows in the upper 20s. South winds around 10 mph. .WEDNESDAY...Warmer. Partly cloudy. Slight chance of showers. Lows in the mid 30s. Highs around 60. Southwest winds around 10 mph. .THURSDAY...Partly cloudy with chance of showers and slight chance of thunderstorms. Lows in the mid 30s. Highs in the upper 50s. North winds around 10 mph. .FRIDAY...Partly cloudy with slight chance of showers and thunderstorms. Lows in the upper 30s. Highs in the mid 60s. Winds generally less than 10 mph. .SATURDAY...Partly cloudy. Lows in the lower 40s. Highs in the lower 70s. .SUNDAY...Mostly sunny. Highs in the upper 70s. $$ WYZ285-191245- South Bighorn Mountains- 435 AM MDT Mon May 18 2026 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 6 PM MDT THIS EVENING... .TODAY... Sky/weather.........Cloudy. Patchy blowing snow early in the morning. Areas of blowing snow early in the morning, then patchy blowing snow in the late morning and early afternoon. Snow showers until late afternoon. Slight chance of thunderstorms late in the afternoon. Snow showers likely late in the afternoon. Snow accumulation of 2 to 7 inches. Chance of precipitation near 100 percent. Chance of thunder...10 percent. Max temperature.....33-38. 24 hr trend......14 degrees cooler. Min humidity........67-73 percent. 24 hr trend......20 percent wetter. 20-foot winds.......North winds 15 to 20 mph with gusts to around 40 mph until 1500, then around 10 mph with gusts to around 30 mph. Ridge top winds.....North 20 to 25 mph. Chc of wetting rain.85 percent until 1200, then 50 percent. Transport winds.....North 20 to 25 mph. Mixing Height.......800-2800 ft agl. Smoke dispersal.....Poor to fair. .TONIGHT... Sky/weather.........Mostly cloudy then becoming partly cloudy. Patchy fog in the evening. Chance of snow showers early in the evening. Slight chance of snow showers late in the evening. Chance of snow 50 percent. Chance of thunder...0 percent. Min temperature.....22-27. 24 hr trend......2 degrees cooler. Max humidity........80-86 percent. 24 hr trend......8 percent drier. Humidity recovery...Excellent. 20-foot winds.......Downslope/downvalley 4-7 mph. Gusts up to 15 mph. Ridge top winds.....East around 10 mph until 2400, then west. Chc of wetting rain.Less than 5 percent. Transport winds.....Northwest around 10 mph. Mixing Height.......600-2600 ft agl until 2400, then 400-600 ft agl. Smoke dispersal.....Poor. .TUESDAY... Sky/weather.........Partly cloudy then becoming mostly sunny. Chance of thunder...0 percent. Max temperature.....43-48. 24 hr trend......11 degrees warmer. Min humidity........35-41 percent. 24 hr trend......32 percent drier. 20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then southwest around 10 mph. Gusts up to 15 mph. Ridge top winds.....Southwest 10 to 15 mph. Chc of wetting rain.Zero percent. Transport winds.....West 10 to 15 mph. Mixing Height.......1000-3000 ft agl until 1200, then 3200-5200 ft agl. Smoke dispersal.....Poor to fair. .Forecast days 3 through 7...... .TUESDAY NIGHT...Mostly clear. Lows in the upper 20s. Southwest winds around 10 mph. .WEDNESDAY...Partly cloudy. Slight chance of showers and snow showers. Lows in the mid 30s. Highs in the mid 50s. West winds around 10 mph. .THURSDAY...Partly cloudy. Chance of showers, snow showers and slight chance of thunderstorms. Lows in the mid 30s. Highs around 50. Northwest winds around 10 mph. .FRIDAY...Partly cloudy with slight chance of showers, thunderstorms and snow showers. Lows in the upper 30s. Highs in the upper 50s. West winds around 10 mph. .SATURDAY...Partly cloudy. Lows in the mid 40s. Highs in the mid 60s. .SUNDAY...Mostly sunny. Highs in the upper 60s. $$ WYZ281-191245- Johnson County/Casper BLM- Including the cities of Buffalo and Kaycee 435 AM MDT Mon May 18 2026 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 6 PM MDT THIS EVENING... .TODAY... Sky/weather.........Cloudy. Patchy blowing snow in the morning. Snow showers and slight chance of showers in the morning. Snow showers likely with possible showers and thunderstorms in the afternoon. Snow accumulation up to 2 inches. Chance of precipitation 90 percent. Chance of thunder...10 percent. Max temperature.....37-42. 24 hr trend......14 degrees cooler. Min humidity........62-68 percent. 24 hr trend......15 percent wetter. 20-foot winds.......Breezy. North winds 20 to 25 mph with gusts to around 35 mph. Ridge top winds.....North around 25 mph. Chc of wetting rain.60 percent until 1200, then 5 percent. Transport winds.....North 25 to 30 mph. Mixing Height.......2200-4200 ft agl. Smoke dispersal.....Fair to good. .TONIGHT... Sky/weather.........Mostly cloudy then becoming partly cloudy. Chance of snow showers and slight chance of showers early in the evening. Slight chance of snow showers late in the evening. Chance of precipitation 50 percent. Chance of thunder...0 percent. Min temperature.....25-30. 24 hr trend......2 degrees cooler. Max humidity........81-87 percent. 24 hr trend......3 percent drier. Humidity recovery...Excellent. 20-foot winds.......North winds 10 to 15 mph with gusts to around 25 mph until 2400, then downslope/downvalley 4-7 mph. Ridge top winds.....North around 15 mph until 2400, then west around 5 mph. Chc of wetting rain.Zero percent. Transport winds.....North around 15 mph until 2400, then west. Mixing Height.......1600-3600 ft agl until 2400, then 400-800 ft agl. Smoke dispersal.....Poor. .TUESDAY... Sky/weather.........Partly cloudy then becoming mostly sunny. Chance of thunder...0 percent. Max temperature.....52-57. 24 hr trend......15 degrees warmer. Min humidity........26-32 percent. 24 hr trend......33 percent drier. 20-foot winds.......Upslope/upvalley 5-9 mph until 1500, then southwest around 10 mph. Gusts up to 15 mph. Ridge top winds.....Southwest around 10 mph. Chc of wetting rain.Zero percent. Transport winds.....West 10 to 15 mph. Mixing Height.......2000-4000 ft agl until 1200, then 6600-8600 ft agl. Smoke dispersal.....Poor until 1200, then good. .Forecast days 3 through 7...... .TUESDAY NIGHT...Mostly clear. Lows in the lower 30s. South winds around 10 mph. .WEDNESDAY...Partly cloudy. Slight chance of showers and thunderstorms. Lows in the upper 30s. Highs in the mid 60s. West winds around 10 mph. .THURSDAY...Partly cloudy. Chance of showers and slight chance of thunderstorms. Lows in the mid 30s. Highs in the upper 50s. Northwest winds around 10 mph. .FRIDAY...Partly cloudy with slight chance of showers and thunderstorms. Lows in the upper 30s. Highs in the mid 60s. Winds generally less than 10 mph. .SATURDAY THROUGH SUNDAY...Mostly clear. Lows in the mid 40s. Highs 74 to 79. $$ WYZ282-191245- South Bighorn Basin/Worland BLM- Including the cities of Ten Sleep, Thermopolis, and Worland 435 AM MDT Mon May 18 2026 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 6 PM MDT THIS EVENING... .TODAY... Sky/weather.........Cloudy. Patchy blowing snow early in the morning. Snow showers in the morning. Chance of showers through the day. Chance of snow showers in the afternoon. Snow accumulation up to 2 inches. Chance of precipitation 90 percent. Chance of thunder...0 percent. Max temperature.....38-43. 24 hr trend......12 degrees cooler. Min humidity........50-56 percent. 24 hr trend......13 percent wetter. 20-foot winds.......Breezy. Northwest winds 20 to 25 mph with gusts to around 45 mph. Ridge top winds.....Northwest 25 to 30 mph. Chc of wetting rain.35 percent until 1200, then 5 percent. Transport winds.....North 25 to 30 mph. Mixing Height.......1600-3600 ft agl until 1200, then 4000-6000 ft agl. Smoke dispersal.....Good. .TONIGHT... Sky/weather.........Partly cloudy. Slight chance of showers early in the evening. Chance of showers 20 percent. Chance of thunder...0 percent. Min temperature.....22-27. 24 hr trend......3 degrees cooler. Max humidity........77-83 percent. 24 hr trend......5 percent drier. Humidity recovery...Excellent. 20-foot winds.......Northwest winds 10 to 15 mph with gusts to around 25 mph until 2400, then downslope/downvalley 4-7 mph. Ridge top winds.....Northwest around 15 mph until 2400, then southwest. Chc of wetting rain.Zero percent. Transport winds.....Northwest around 15 mph until 2400, then west. Mixing Height.......2400-4400 ft agl until 2400, then 400 ft agl. Smoke dispersal.....Fair to good until 2400, then poor. .TUESDAY... Sky/weather.........Mostly sunny. Chance of thunder...0 percent. Max temperature.....49-54. 24 hr trend......12 degrees warmer. Min humidity........22-28 percent. 24 hr trend......21 percent drier. 20-foot winds.......Upslope/upvalley 5-9 mph until 1500, then south around 10 mph and gusty. Ridge top winds.....South around 10 mph. Chc of wetting rain.Zero percent. Transport winds.....Southwest 10 to 15 mph. Mixing Height.......1800-3800 ft agl until 1200, then 6000-8000 ft agl. Smoke dispersal.....Poor until 1200, then good. .Forecast days 3 through 7...... .TUESDAY NIGHT...Mostly clear. Lows in the lower 30s. South winds around 10 mph. .WEDNESDAY...Warmer. Partly cloudy. Slight chance of showers and thunderstorms. Lows in the upper 30s. Highs in the mid 60s. Winds generally less than 10 mph. .THURSDAY...Partly cloudy with chance of showers and slight chance of thunderstorms. Lows in the upper 30s. Highs in the upper 50s. Northwest winds around 10 mph. .FRIDAY...Partly cloudy with slight chance of showers and thunderstorms. Lows in the lower 40s. Highs in the upper 60s. Winds generally less than 10 mph. .SATURDAY...Partly cloudy. Lows in the mid 40s. Highs in the mid 70s. .SUNDAY...Mostly sunny. Highs around 80. $$ WYZ275-191245- North Bighorn Basin/Worland BLM- Including the cities of Greybull, Lovell, and Powell 435 AM MDT Mon May 18 2026 .TODAY... Sky/weather.........Cloudy. Chance of snow showers in the morning. Slight chance of showers through the day. Slight chance of snow showers in the afternoon. Chance of precipitation 50 percent. Chance of thunder...0 percent. Max temperature.....37-42. 24 hr trend......9 degrees cooler. Min humidity........47-53 percent. 24 hr trend......9 percent wetter. 20-foot winds.......Windy. North winds 25 to 30 mph with gusts to around 45 mph until 1500, then around 20 mph with gusts to around 40 mph. Ridge top winds.....North around 30 mph. Chc of wetting rain.Less than 5 percent. Transport winds.....North around 30 mph. Mixing Height.......1800-3800 ft agl until 1200, then 4600-6200 ft agl. Smoke dispersal.....Good until 1200, then very good. .TONIGHT... Sky/weather.........Partly cloudy. Chance of thunder...0 percent. Min temperature.....21-26. 24 hr trend......4 degrees cooler. Max humidity........73-79 percent. 24 hr trend......Unchanged. Humidity recovery...Excellent. 20-foot winds.......North winds around 20 mph with gusts to around 30 mph until 2100, then around 10 mph with gusts to around 30 mph until 2400, then downslope/downvalley 4-7 mph. Ridge top winds.....North around 20 mph until 2400, then southwest around 5 mph. Chc of wetting rain.Zero percent. Transport winds.....North around 20 mph until 2400, then west around 5 mph. Mixing Height.......2200-4200 ft agl until 2400, then 400 ft agl. Smoke dispersal.....Fair to good until 2400, then poor. .TUESDAY... Sky/weather.........Mostly sunny. Chance of thunder...0 percent. Max temperature.....49-54. 24 hr trend......13 degrees warmer. Min humidity........22-28 percent. 24 hr trend......20 percent drier. 20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then south around 10 mph. Gusts up to 15 mph. Ridge top winds.....South 10 to 15 mph. Chc of wetting rain.Zero percent. Transport winds.....Southwest 10 to 15 mph. Mixing Height.......1800-3800 ft agl until 1200, then 7000-9000 ft agl. Smoke dispersal.....Poor until 1200, then good to very good. .Forecast days 3 through 7...... .TUESDAY NIGHT...Not as cool. Mostly clear. Lows in the mid 30s. Southeast winds around 10 mph. .WEDNESDAY...Warmer. Partly cloudy. Chance of showers and slight chance of thunderstorms. Lows around 40. Highs in the upper 60s. West winds around 10 mph. .THURSDAY...Partly cloudy with slight chance of showers and thunderstorms. Lows in the upper 30s. Highs around 60. Northwest winds around 15 mph. .FRIDAY...Partly cloudy with slight chance of showers and thunderstorms. Lows in the lower 40s. Highs in the upper 60s. Winds generally less than 10 mph. .SATURDAY...Partly cloudy. Lows in the upper 40s. Highs in the mid 70s. .SUNDAY...Mostly sunny. Highs around 80. $$ WYZ276-191245- Cody Foothills- Including the cities of Clark, Cody, and Meeteetse 435 AM MDT Mon May 18 2026 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 6 PM MDT THIS EVENING... .TODAY... Sky/weather.........Mostly cloudy. Chance of snow showers in the morning. Slight chance of snow showers in the afternoon. Patchy blowing snow until late afternoon. Chance of snow 50 percent. Chance of thunder...0 percent. Max temperature.....39-44. 24 hr trend......6 degrees cooler. Min humidity........46-52 percent. 24 hr trend......6 percent wetter. 20-foot winds.......Windy. North winds 25 to 30 mph with gusts to around 50 mph until 1500, then around 20 mph with gusts to around 45 mph. Ridge top winds.....North around 30 mph. Chc of wetting rain.15 percent until 1200, then zero percent. Transport winds.....North 30 to 35 mph. Mixing Height.......1800-3800 ft agl until 1200, then 4000-5800 ft agl. Smoke dispersal.....Good to very good. .TONIGHT... Sky/weather.........Partly cloudy. Chance of snow showers early in the evening. Slight chance of snow showers late in the evening. Chance of snow 50 percent. Chance of thunder...0 percent. Min temperature.....24-29. 24 hr trend......2 degrees cooler. Max humidity........66-72 percent. 24 hr trend......11 percent drier. Humidity recovery...Good. 20-foot winds.......North winds around 15 mph with gusts to around 30 mph until 2100, then downslope/downvalley 4-7 mph. Ridge top winds.....North around 15 mph until 2400, then west. Chc of wetting rain.Zero percent. Transport winds.....North around 15 mph until 2400, then west. Mixing Height.......2000-4000 ft agl until 2400, then 400-600 ft agl. Smoke dispersal.....Fair to good until 2400, then poor. .TUESDAY... Sky/weather.........Mostly sunny then becoming partly cloudy. Chance of thunder...0 percent. Max temperature.....52-57. 24 hr trend......13 degrees warmer. Min humidity........24-30 percent. 24 hr trend......22 percent drier. 20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then southeast around 10 mph. Gusts up to 15 mph. Ridge top winds.....South 10 to 15 mph. Chc of wetting rain.Zero percent. Transport winds.....West 10 to 15 mph. Mixing Height.......2600-4600 ft agl until 1200, then 8600-10600 ft agl. Smoke dispersal.....Poor to fair until 1200, then very good. .Forecast days 3 through 7...... .TUESDAY NIGHT...Partly cloudy. Lows in the mid 30s. Southwest winds around 10 mph. .WEDNESDAY...Partly cloudy. Chance of showers and slight chance of thunderstorms. Lows in the upper 30s. Highs in the lower 60s. Northwest winds around 10 mph. .THURSDAY...Partly cloudy with chance of showers, snow showers and slight chance of thunderstorms. Lows in the upper 30s. Highs in the mid 50s. Northwest winds around 10 mph. .FRIDAY...Partly cloudy with chance of showers and thunderstorms. Lows in the lower 40s. Highs in the lower 60s. Winds generally less than 10 mph. .SATURDAY...Partly cloudy. Lows in the upper 40s. Highs in the lower 70s. .SUNDAY...Mostly sunny. Highs in the mid 70s. $$ WYZ287-191245- Owl Creek Mountains- 435 AM MDT Mon May 18 2026 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 6 PM MDT THIS EVENING... .TODAY... Sky/weather.........Cloudy. Blowing snow in the morning, then patchy blowing snow in the afternoon. Snow showers in the morning, then chance of snow showers and slight chance of showers in the afternoon. Snow accumulation of 1 to 4 inches. Chance of precipitation 90 percent. Chance of thunder...0 percent. Max temperature.....33-38. 24 hr trend......9 degrees cooler. Min humidity........53-59 percent. 24 hr trend......7 percent wetter. 20-foot winds.......Windy. North winds around 35 mph with gusts to around 60 mph until 1200, then 20 to 25 mph with gusts to around 45 mph. Ridge top winds.....North around 40 mph until 1200, then around 30 mph. Chc of wetting rain.65 percent until 1200, then zero percent. Transport winds.....North around 40 mph until 1200, then around 30 mph. Mixing Height.......1000-3000 ft agl until 1200, then 3400-5200 ft agl. Smoke dispersal.....Good. .TONIGHT... Sky/weather.........Partly cloudy. Patchy blowing snow early in the evening. Slight chance of snow showers early in the evening. Chance of snow 20 percent. Chance of thunder...0 percent. Min temperature.....22-27. 24 hr trend......Unchanged. Max humidity........71-77 percent. 24 hr trend......19 percent drier. Humidity recovery...Excellent. 20-foot winds.......North winds 10 to 15 mph with gusts to around 25 mph until 2400, then downslope/downvalley 4-7 mph. Ridge top winds.....North around 15 mph until 2400, then west. Chc of wetting rain.Zero percent. Transport winds.....North around 15 mph until 2400, then west. Mixing Height.......1800-3800 ft agl until 2400, then 400-600 ft agl. Smoke dispersal.....Poor to fair until 2400, then poor. .TUESDAY... Sky/weather.........Mostly sunny. Chance of thunder...0 percent. Max temperature.....43-48. 24 hr trend......12 degrees warmer. Min humidity........32-38 percent. 24 hr trend......22 percent drier. 20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then south 10 to 15 mph with gusts to around 25 mph. Ridge top winds.....South 10 to 15 mph. Chc of wetting rain.Zero percent. Transport winds.....Southwest 10 to 15 mph. Mixing Height.......1600-3600 ft agl until 1200, then 6000-8000 ft agl. Smoke dispersal.....Poor until 1200, then good to very good. .Forecast days 3 through 7...... .TUESDAY NIGHT...Mostly clear. Lows in the lower 30s. South winds around 10 mph. .WEDNESDAY...Warmer. Partly cloudy. Chance of snow showers, slight chance of showers and thunderstorms. Lows in the upper 30s. Highs in the upper 50s. West winds around 10 mph. .THURSDAY...Partly cloudy. Chance of showers, snow showers and slight chance of thunderstorms. Lows in the mid 30s. Highs in the lower 50s. North winds around 15 mph. .FRIDAY...Partly cloudy with chance of showers and thunderstorms. Lows in the lower 40s. Highs around 60. Winds generally less than 10 mph. .SATURDAY...Partly cloudy. Lows in the mid 40s. Highs in the upper 60s. .SUNDAY...Mostly sunny. Highs in the lower 70s. $$ WYZ286-191245- Absaroka Mountains/North Shoshone NF- Including the city of Pahaska 435 AM MDT Mon May 18 2026 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 6 PM MDT THIS EVENING... .TODAY... Sky/weather.........Mostly cloudy. Snow showers in the morning, then snow showers likely and slight chance of thunderstorms in the afternoon. Patchy blowing snow early in the morning. Areas of blowing snow late in the morning, then patchy blowing snow late in the morning. Snow accumulation up to 3 inches. Chance of precipitation near 100 percent. Chance of thunder...10 percent. Max temperature.....32-37. 24 hr trend......6 degrees cooler. Min humidity........56-62 percent. 24 hr trend......14 percent wetter. 20-foot winds.......Northeast winds around 15 mph with gusts to around 30 mph. Ridge top winds.....Northeast around 20 mph. Chc of wetting rain.20 percent until 1200, then 5 percent. Transport winds.....Northeast around 20 mph. Mixing Height.......1000-3000 ft agl until 1200, then 3200-4400 ft agl. Smoke dispersal.....Poor to fair. .TONIGHT... Sky/weather.........Partly cloudy. Chance of snow showers early in the evening. Slight chance of snow showers late in the evening. Chance of snow 50 percent. Chance of thunder...0 percent. Min temperature.....17-22. 24 hr trend......3 degrees cooler. Max humidity........78-84 percent. 24 hr trend......17 percent drier. Humidity recovery...Excellent. 20-foot winds.......Northeast winds around 10 mph until 2100, then downslope/downvalley 4-7 mph. Gusts up to 20 mph. Ridge top winds.....Northeast around 10 mph until 2400, then west. Chc of wetting rain.Less than 5 percent. Transport winds.....Northeast around 10 mph until 2400, then west. Mixing Height.......1000-3000 ft agl until 2400, then 600 ft agl. Smoke dispersal.....Poor. .TUESDAY... Sky/weather.........Mostly sunny then becoming partly cloudy. Chance of thunder...0 percent. Max temperature.....42-47. 24 hr trend......11 degrees warmer. Min humidity........38-44 percent. 24 hr trend......22 percent drier. 20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then southwest around 10 mph. Gusts up to 15 mph. Ridge top winds.....West 10 to 15 mph. Chc of wetting rain.Zero percent. Transport winds.....West 10 to 15 mph. Mixing Height.......2600-4600 ft agl until 1200, then 7000-9000 ft agl. Smoke dispersal.....Poor to fair until 1200, then good to very good. .Forecast days 3 through 7...... .TUESDAY NIGHT...Partly cloudy. Lows in the mid 20s. Southwest winds around 10 mph. .WEDNESDAY THROUGH THURSDAY...Partly cloudy with chance of snow showers, showers and slight chance of thunderstorms. Lows 28 to 33. Highs 44 to 49. Northwest winds around 10 mph. .FRIDAY...Partly cloudy with chance of thunderstorms, showers and snow showers. Lows in the lower 30s. Highs in the lower 50s. West winds around 10 mph. .SATURDAY...Partly cloudy. Lows in the upper 30s. Highs in the upper 50s. .SUNDAY...Mostly sunny. Highs in the lower 60s. $$ WYZ140-191245- Yellowstone National Park- Including the cities of Lake, Mammoth, and Old Faithful 435 AM MDT Mon May 18 2026 .TODAY... Sky/weather.........Mostly cloudy. Slight chance of snow showers early in the morning. Chance of snow showers early in the afternoon, then slight chance of snow showers late in the afternoon. Chance of snow 50 percent. Chance of thunder...0 percent. Max temperature.....35-40. 24 hr trend......1 degree cooler. Min humidity........43-49 percent. 24 hr trend......Unchanged. 20-foot winds.......North winds around 15 mph with gusts to around 30 mph. Ridge top winds.....North around 20 mph. Chc of wetting rain.Zero percent. Transport winds.....North around 20 mph. Mixing Height.......2000-4000 ft agl until 1200, then 5000-6800 ft agl. Smoke dispersal.....Good. .TONIGHT... Sky/weather.........Partly cloudy. Slight chance of snow showers early in the evening. Chance of snow 20 percent. Chance of thunder...0 percent. Min temperature.....17-22. 24 hr trend......Unchanged. Max humidity........76-82 percent. 24 hr trend......6 percent drier. Humidity recovery...Excellent. 20-foot winds.......North winds around 10 mph and gusty until 2100, then downslope/downvalley 4-7 mph. Ridge top winds.....North around 15 mph until 2400, then northeast around 5 mph. Chc of wetting rain.Zero percent. Transport winds.....Northeast around 15 mph until 2400, then southeast around 5 mph. Mixing Height.......2400-4400 ft agl until 2400, then 400-1000 ft agl. Smoke dispersal.....Poor to fair until 2400, then poor. .TUESDAY... Sky/weather.........Mostly sunny then becoming partly cloudy. Chance of thunder...0 percent. Max temperature.....45-50. 24 hr trend......9 degrees warmer. Min humidity........30-36 percent. 24 hr trend......12 percent drier. 20-foot winds.......Upslope/upvalley 5-9 mph. Gusts up to 15 mph. Ridge top winds.....Southwest 5 to 10 mph. Chc of wetting rain.Zero percent. Transport winds.....West 10 to 15 mph. Mixing Height.......3000-5000 ft agl until 1200, then 8200-9600 ft agl. Smoke dispersal.....Poor to fair until 1200, then very good. .Forecast days 3 through 7...... .TUESDAY NIGHT...Partly cloudy. Lows in the mid 20s. Winds generally less than 10 mph. .WEDNESDAY...Partly cloudy. Chance of showers, snow showers and slight chance of thunderstorms. Lows in the upper 20s. Highs around 50. Winds generally less than 10 mph. .THURSDAY...Partly cloudy with slight chance of showers, thunderstorms and snow showers. Lows in the upper 20s. Highs in the upper 40s. Winds generally less than 10 mph. .FRIDAY...Partly cloudy with chance of showers, snow showers and slight chance of thunderstorms. Lows in the lower 30s. Highs in the mid 50s. Winds generally less than 10 mph. .SATURDAY...Partly cloudy. Lows in the mid 30s. Highs around 60. .SUNDAY...Mostly sunny. Highs in the lower 60s. $$ WYZ415-191245- North Zone Bridger Teton NF and Grand Teton NP- Including the cities of Jackson and Moran 435 AM MDT Mon May 18 2026 .TODAY... Sky/weather.........Mostly cloudy. Chance of snow showers through the day. Slight chance of thunderstorms in the afternoon. Chance of precipitation 50 percent. Chance of thunder...20 percent. Max temperature.....37-42. 24 hr trend......3 degrees cooler. Min humidity........47-53 percent. 24 hr trend......5 percent wetter. 20-foot winds.......Northeast winds 10 to 15 mph. Gusts up to 30 mph until 1200, then 20 mph. Ridge top winds.....Northeast 15 to 20 mph. Chc of wetting rain.Less than 5 percent. Transport winds.....Northeast 15 to 20 mph. Mixing Height.......1400-3400 ft agl until 1200, then 4000-5600 ft agl. Smoke dispersal.....Fair to good. .TONIGHT... Sky/weather.........Partly cloudy. Chance of snow showers early in the evening. Slight chance of snow showers early in the evening. Chance of snow 50 percent. Chance of thunder...0 percent. Min temperature.....17-22. 24 hr trend......2 degrees cooler. Max humidity........79-85 percent. 24 hr trend......11 percent drier. Humidity recovery...Excellent. 20-foot winds.......North winds around 10 mph until 2100, then downslope/downvalley 4-7 mph. Gusts up to 15 mph. Ridge top winds.....Northeast around 15 mph until 2400, then east. Chc of wetting rain.Zero percent. Transport winds.....East 10 to 15 mph. Mixing Height.......1800-3800 ft agl until 2400, then 400-600 ft agl. Smoke dispersal.....Poor. .TUESDAY... Sky/weather.........Partly cloudy. Chance of thunder...0 percent. Max temperature.....44-49. 24 hr trend......8 degrees warmer. Min humidity........34-40 percent. 24 hr trend......13 percent drier. 20-foot winds.......Upslope/upvalley 5-9 mph. Gusts up to 15 mph. Ridge top winds.....South around 10 mph until 1200, then west. Chc of wetting rain.Zero percent. Transport winds.....North around 10 mph until 1200, then west. Mixing Height.......2400-4400 ft agl until 1200, then 6800-8800 ft agl. Smoke dispersal.....Poor until 1200, then good. .Forecast days 3 through 7...... .TUESDAY NIGHT...Mostly clear. Lows in the mid 20s. Winds generally less than 10 mph. .WEDNESDAY...Partly cloudy. Chance of snow showers, showers and slight chance of thunderstorms. Lows in the lower 30s. Highs around 50. Winds generally less than 10 mph. .THURSDAY...Partly cloudy with slight chance of showers, thunderstorms and snow showers. Lows around 30. Highs around 50. Winds generally less than 10 mph. .FRIDAY...Partly cloudy with chance of showers, thunderstorms and snow showers. Lows in the lower 30s. Highs in the mid 50s. Winds generally less than 10 mph. .SATURDAY...Partly cloudy. Lows in the mid 30s. Highs in the lower 60s. .SUNDAY...Mostly sunny. Highs in the mid 60s. $$ WYZ416-191245- West Wind River Mountains/East Zone Bridger Teton NF- 435 AM MDT Mon May 18 2026 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 6 PM MDT THIS EVENING... .TODAY... Sky/weather.........Cloudy. Blowing snow in the morning, then patchy blowing snow in the afternoon. Snow showers in the morning, then snow showers likely and slight chance of thunderstorms in the afternoon. Snow accumulation up to 3 inches. Chance of precipitation near 100 percent. Chance of thunder...20 percent. Max temperature.....31-36. 24 hr trend......8 degrees cooler. Min humidity........51-57 percent. 24 hr trend......19 percent wetter. 20-foot winds.......Windy. Northeast winds 25 to 30 mph with gusts to around 45 mph until 1200, then 10 to 15 mph with gusts to around 35 mph. Ridge top winds.....Northeast around 30 mph until 1200, then around 20 mph. Chc of wetting rain.25 percent until 1200, then 15 percent. Transport winds.....Northeast around 35 mph until 1200, then around 20 mph. Mixing Height.......1600-3600 ft agl. Smoke dispersal.....Poor to fair. .TONIGHT... Sky/weather.........Mostly cloudy. Patchy fog early in the evening. Snow showers and slight chance of thunderstorms in the evening. Chance of snow showers after midnight. Snow accumulation up to 3 inches. Chance of precipitation 90 percent. Chance of thunder...10 percent. Min temperature.....18-23. 24 hr trend......1 degree cooler. Max humidity........84-90 percent. 24 hr trend......4 percent drier. Humidity recovery...Excellent. 20-foot winds.......Northeast winds around 10 mph with gusts to around 15 mph until 2100, then downslope/downvalley 4-7 mph. Ridge top winds.....East around 10 mph until 2400, then south. Chc of wetting rain.40 percent until 2400, then 5 percent. Transport winds.....Northeast around 10 mph until 2400, then south. Mixing Height.......800-2800 ft agl until 2400, then 600 ft agl. Smoke dispersal.....Poor. .TUESDAY... Sky/weather.........Partly cloudy. Chance of thunder...0 percent. Max temperature.....38-43. 24 hr trend......7 degrees warmer. Min humidity........47-53 percent. 24 hr trend......5 percent drier. 20-foot winds.......Upslope/upvalley 5-9 mph. Ridge top winds.....West 5 to 10 mph. Chc of wetting rain.Zero percent. Transport winds.....Northwest around 10 mph. Mixing Height.......1800-3800 ft agl until 1200, then 4600-6600 ft agl. Smoke dispersal.....Poor to fair. .Forecast days 3 through 7...... .TUESDAY NIGHT...Partly cloudy. Lows in the lower 20s. Winds generally less than 10 mph. .WEDNESDAY...Partly cloudy. Slight chance of snow showers. Lows in the upper 20s. Highs in the mid 40s. Winds generally less than 10 mph. .THURSDAY...Partly cloudy. Slight chance of thunderstorms, snow showers and showers. Lows in the upper 20s. Highs in the mid 40s. Winds generally less than 10 mph. .FRIDAY...Partly cloudy with chance of thunderstorms, showers and snow showers. Lows around 30. Highs around 50. Winds generally less than 10 mph. .SATURDAY...Partly cloudy. Lows in the lower 30s. Highs in the mid 50s. .SUNDAY...Mostly sunny. Highs around 60. $$ WYZ288-191245- East Wind River Mountains/South Shoshone NF- Including the cities of Dubois and South Pass 435 AM MDT Mon May 18 2026 ...WINTER STORM WARNING IN EFFECT UNTIL 6 PM MDT THIS EVENING... .TODAY... Sky/weather.........Cloudy. Blowing snow in the morning. Areas of blowing snow early in the afternoon. Patchy blowing snow early in the afternoon. Snow showers in the morning. Snow showers likely early in the afternoon. Chance of snow showers and slight chance of thunderstorms late in the afternoon. Snow accumulation of 1 to 9 inches. Chance of precipitation near 100 percent. Chance of thunder...10 percent. Max temperature.....27-32. 24 hr trend......12 degrees cooler. Min humidity........67-73 percent. 24 hr trend......35 percent wetter. 20-foot winds.......Breezy. Northeast winds 20 to 25 mph with gusts to around 50 mph until 1500, then around 15 mph with gusts to around 40 mph. Ridge top winds.....Northeast around 30 mph until 1200, then around 20 mph. Chc of wetting rain.80 percent until 1200, then 5 percent. Transport winds.....Northeast around 30 mph until 1200, then around 20 mph. Mixing Height.......1200-3200 ft agl. Smoke dispersal.....Poor to fair. .TONIGHT... Sky/weather.........Mostly cloudy then becoming partly cloudy. Patchy fog in the evening. Chance of snow showers in the evening. Slight chance of snow showers after midnight. Chance of snow 50 percent. Chance of thunder...0 percent. Min temperature.....15-20. 24 hr trend......2 degrees cooler. Max humidity........80-86 percent. 24 hr trend......11 percent drier. Humidity recovery...Excellent. 20-foot winds.......Northeast winds around 10 mph and gusty until 2100, then downslope/downvalley 4-7 mph. Ridge top winds.....Northeast around 10 mph until 2400, then west. Chc of wetting rain.10 percent until 2400, then zero percent. Transport winds.....Northeast around 15 mph until 2400, then west. Mixing Height.......400-2400 ft agl. Smoke dispersal.....Poor. .TUESDAY... Sky/weather.........Partly cloudy. Chance of thunder...0 percent. Max temperature.....37-42. 24 hr trend......10 degrees warmer. Min humidity........48-54 percent. 24 hr trend......21 percent drier. 20-foot winds.......Upslope/upvalley 5-9 mph until 1500, then southwest around 10 mph. Gusts up to 15 mph. Ridge top winds.....Southwest around 10 mph. Chc of wetting rain.Zero percent. Transport winds.....West 10 to 15 mph. Mixing Height.......1400-3400 ft agl until 1200, then 3400-5400 ft agl. Smoke dispersal.....Poor to fair. .Forecast days 3 through 7...... .TUESDAY NIGHT...Partly cloudy. Lows in the lower 20s. Winds generally less than 10 mph. .WEDNESDAY...Partly cloudy. Slight chance of snow showers. Lows in the lower 30s. Highs in the upper 40s. West winds around 10 mph. .THURSDAY...Partly cloudy with chance of snow showers, showers and slight chance of thunderstorms. Lows in the upper 20s. Highs in the upper 40s. Winds generally less than 10 mph. .FRIDAY...Partly cloudy with chance of thunderstorms, snow showers and slight chance of showers. Lows in the lower 30s. Highs in the lower 50s. West winds around 10 mph. .SATURDAY...Partly cloudy. Lows in the upper 30s. Highs in the upper 50s. .SUNDAY...Mostly sunny. Highs in the lower 60s. $$ WYZ414-191245- Salt and Wyoming Ranges/West Zone Bridger Teton NF- Including the city of Afton 435 AM MDT Mon May 18 2026 .TODAY... Sky/weather.........Cloudy. Chance of snow showers through the day. Chance of showers and slight chance of thunderstorms in the afternoon. Chance of precipitation 50 percent. Chance of thunder...20 percent. Max temperature.....36-41. 24 hr trend......4 degrees cooler. Min humidity........54-60 percent. 24 hr trend......19 percent wetter. 20-foot winds.......North winds 10 to 15 mph. Gusts up to 25 mph until 1200, then 15 mph. Ridge top winds.....North around 15 mph. Chc of wetting rain.15 percent. Transport winds.....North around 15 mph. Mixing Height.......1200-3200 ft agl until 1200, then 3400-5000 ft agl. Smoke dispersal.....Poor to fair. .TONIGHT... Sky/weather.........Partly cloudy. Patchy fog in the evening. Chance of snow showers early in the evening. Slight chance of thunderstorms early in the evening. Slight chance of snow showers early in the evening. Chance of precipitation 50 percent. Chance of thunder...10 percent. Min temperature.....21-26. 24 hr trend......1 degree cooler. Max humidity........84-90 percent. 24 hr trend......6 percent drier. Humidity recovery...Excellent. 20-foot winds.......Northwest winds around 10 mph until 2100, then downslope/downvalley 4-7 mph. Gusts up to 15 mph. Ridge top winds.....Northwest around 15 mph until 2400, then southeast. Chc of wetting rain.Zero percent. Transport winds.....North around 15 mph until 2400, then southeast. Mixing Height.......1600-3600 ft agl until 2400, then 400-800 ft agl. Smoke dispersal.....Poor. .TUESDAY... Sky/weather.........Partly cloudy. Isolated snow showers in the afternoon. Isolated thunderstorms late in the afternoon. Chance of precipitation 20 percent. Chance of thunder...10 percent. Max temperature.....43-48. 24 hr trend......7 degrees warmer. Min humidity........42-48 percent. 24 hr trend......14 percent drier. 20-foot winds.......Upslope/upvalley 5-9 mph. Gusts up to 15 mph. Ridge top winds.....South around 10 mph until 1200, then west. Chc of wetting rain.Zero percent. Transport winds.....East around 10 mph until 1200, then northwest. Mixing Height.......2200-4200 ft agl until 1200, then 6400-8400 ft agl. Smoke dispersal.....Poor to fair. .Forecast days 3 through 7...... .TUESDAY NIGHT...Mostly clear. Lows in the mid 20s. Winds generally less than 10 mph. .WEDNESDAY...Partly cloudy. Lows in the lower 30s. Highs in the lower 50s. Winds generally less than 10 mph. .THURSDAY THROUGH FRIDAY...Partly cloudy with slight chance of showers, thunderstorms and snow showers. Lows 30 to 35. Highs 52 to 57. Southwest winds around 10 mph. .SATURDAY THROUGH SUNDAY...Mostly clear. Lows in the upper 30s. Highs 62 to 67. $$ WYZ278-191245- Upper Green River Basin/Rock Springs BLM- Including the cities of Big Piney, Farson, and Pinedale 435 AM MDT Mon May 18 2026 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 6 PM MDT THIS EVENING... .TODAY... Sky/weather.........Cloudy. Patchy blowing snow early in the morning. Snow showers in the morning, then snow showers likely, slight chance of thunderstorms and showers in the afternoon. Snow accumulation up to 1 inch. Chance of precipitation 90 percent. Chance of thunder...20 percent. Max temperature.....34-39. 24 hr trend......9 degrees cooler. Min humidity........55-61 percent. 24 hr trend......35 percent wetter. 20-foot winds.......Northeast winds 10 to 15 mph with gusts to around 35 mph until 1500, then southeast with gusts to around 25 mph. Ridge top winds.....North around 20 mph until 1200, then east. Chc of wetting rain.40 percent until 1200, then 10 percent. Transport winds.....Northeast around 25 mph until 1200, then around 15 mph. Mixing Height.......2000-4000 ft agl. Smoke dispersal.....Poor to fair. .TONIGHT... Sky/weather.........Mostly cloudy. Snow showers likely, slight chance of showers and thunderstorms early in the evening, then chance of snow showers in the late evening and early morning. Slight chance of snow showers after midnight. Patchy fog after midnight. Snow accumulation up to 2 inches. Chance of precipitation 70 percent. Chance of thunder...10 percent. Min temperature.....21-26. 24 hr trend......2 degrees cooler. Max humidity........83-89 percent. 24 hr trend......4 percent wetter. Humidity recovery...Excellent. 20-foot winds.......South winds around 10 mph until 2400, then downslope/downvalley 4-7 mph. Gusts up to 20 mph. Ridge top winds.....South 10 to 15 mph. Chc of wetting rain.35 percent until 2400, then zero percent. Transport winds.....Southeast 10 to 15 mph. Mixing Height.......1000-3000 ft agl until 2400, then 400-1000 ft agl. Smoke dispersal.....Poor. .TUESDAY... Sky/weather.........Partly cloudy. Chance of thunder...0 percent. Max temperature.....41-46. 24 hr trend......8 degrees warmer. Min humidity........44-50 percent. 24 hr trend......18 percent drier. 20-foot winds.......Upslope/upvalley 5-9 mph. 10 mph after 1200. Ridge top winds.....Southwest 5 to 10 mph. Chc of wetting rain.Zero percent. Transport winds.....Northwest 5 to 10 mph. Mixing Height.......1200-3200 ft agl until 1200, then 4400-6400 ft agl. Smoke dispersal.....Poor to fair. .Forecast days 3 through 7...... .TUESDAY NIGHT...Mostly clear. Lows in the lower 20s. Winds generally less than 10 mph. .WEDNESDAY...Warmer. Partly cloudy. Lows in the upper 20s. Highs in the mid 50s. Winds generally less than 10 mph. .THURSDAY...Partly cloudy with slight chance of showers, thunderstorms and snow showers. Lows in the upper 20s. Highs in the upper 50s. Northwest winds around 10 mph. .FRIDAY...Partly cloudy with slight chance of showers and thunderstorms. Lows in the lower 30s. Highs in the lower 60s. Winds generally less than 10 mph. .SATURDAY THROUGH SUNDAY...Mostly clear. Lows in the mid 30s. Highs 67 to 72. $$ WYZ277-191245- Lincoln and Uinta Counties/Lower Elevations- Including the cities of Evanston, Fort Bridger, and Kemmerer 435 AM MDT Mon May 18 2026 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 6 PM MDT THIS EVENING... .TODAY... Sky/weather.........Cloudy. Snow showers in the morning, then chance of snow showers, showers and slight chance of thunderstorms in the afternoon. Snow accumulation up to 2 inches. Chance of precipitation near 100 percent. Chance of thunder...20 percent. Max temperature.....36-41. 24 hr trend......9 degrees cooler. Min humidity........67-73 percent. 24 hr trend......47 percent wetter. 20-foot winds.......North winds around 10 mph with gusts to around 25 mph until 1200, then upslope/upvalley 5-9 mph until 1500, then south around 10 mph and gusty. Ridge top winds.....North around 15 mph until 1200, then south. Chc of wetting rain.55 percent until 1200, then 10 percent. Transport winds.....North around 20 mph until 1200, then south. Mixing Height.......1000-3000 ft agl. Smoke dispersal.....Poor. .TONIGHT... Sky/weather.........Partly cloudy then becoming mostly cloudy. Chance of snow showers, slight chance of showers and thunderstorms in the evening. Patchy fog early in the evening. Chance of precipitation 50 percent. Chance of thunder...10 percent. Min temperature.....20-25. 24 hr trend......2 degrees cooler. Max humidity........88-94 percent. 24 hr trend......3 percent drier. Humidity recovery...Excellent. 20-foot winds.......South winds around 10 mph until 2400, then downslope/downvalley 4-7 mph. Gusts up to 15 mph. Ridge top winds.....South around 15 mph until 2400, then east. Chc of wetting rain.Zero percent. Transport winds.....Southeast 10 to 15 mph. Mixing Height.......400-2400 ft agl. Smoke dispersal.....Poor. .TUESDAY... Sky/weather.........Partly cloudy. Chance of thunder...0 percent. Max temperature.....44-49. 24 hr trend......9 degrees warmer. Min humidity........41-47 percent. 24 hr trend......32 percent drier. 20-foot winds.......Upslope/upvalley 5-9 mph. Ridge top winds.....Southeast around 5 mph until 1200, then south. Chc of wetting rain.Zero percent. Transport winds.....East around 5 mph until 1200, then north. Mixing Height.......800-2800 ft agl until 1200, then 4200-6200 ft agl. Smoke dispersal.....Poor. .Forecast days 3 through 7...... .TUESDAY NIGHT...Mostly clear. Lows in the mid 20s. Winds generally less than 10 mph. .WEDNESDAY THROUGH THURSDAY...Partly cloudy. Lows in the lower 30s. Highs 54 to 59. West winds around 10 mph. .FRIDAY...Partly cloudy with slight chance of showers. Lows in the mid 30s. Highs in the lower 60s. Winds generally less than 10 mph. .SATURDAY THROUGH SUNDAY...Mostly clear. Lows in the upper 30s. Highs 67 to 72. $$ WYZ279-191245- Sweetwater County/Rock Springs BLM/Flaming Gorge NRA- Including the cities of Green River, Rock Springs, and Wamsutter 435 AM MDT Mon May 18 2026 ...WINTER STORM WARNING IN EFFECT UNTIL 6 PM MDT THIS EVENING... .TODAY... Sky/weather.........Mostly cloudy. Blowing snow in the morning. Areas of blowing snow early in the afternoon. Patchy blowing snow in the afternoon. Snow showers through the day. Slight chance of thunderstorms in the afternoon. Snow accumulation of 1 to 7 inches. Chance of precipitation near 100 percent. Chance of thunder...10 percent. Max temperature.....32-37. 24 hr trend......20 degrees cooler. Min humidity........74-80 percent. 24 hr trend......47 percent wetter. 20-foot winds.......Windy. Northeast winds 30 to 35 mph until 1200, then 20 to 25 mph. Gusts up to 55 mph. Ridge top winds.....Northeast around 35 mph until 1200, then around 25 mph. Chc of wetting rain.90 percent until 1200, then 5 percent. Transport winds.....Northeast 35 to 40 mph. Mixing Height.......1000-3000 ft agl. Smoke dispersal.....Fair to good. .TONIGHT... Sky/weather.........Mostly cloudy then becoming partly cloudy. Patchy blowing snow early in the evening. Patchy fog early in the evening. Patchy fog early in the morning. Chance of thunder...0 percent. Min temperature.....21-26. 24 hr trend......5 degrees cooler. Max humidity........86-92 percent. 24 hr trend......2 percent drier. Humidity recovery...Excellent. 20-foot winds.......Northeast winds around 10 mph with gusts to around 25 mph until 2100, then downslope/downvalley 4-7 mph. Ridge top winds.....Northeast around 15 mph until 2400, then around 5 mph. Chc of wetting rain.Zero percent. Transport winds.....Northeast 10 to 15 mph. Mixing Height.......600-2600 ft agl. Smoke dispersal.....Poor. .TUESDAY... Sky/weather.........Partly cloudy. Chance of thunder...0 percent. Max temperature.....40-45. 24 hr trend......8 degrees warmer. Min humidity........60-66 percent. 24 hr trend......22 percent drier. 20-foot winds.......Upslope/upvalley 5-9 mph. Ridge top winds.....Northeast around 5 mph until 1200, then southwest. Chc of wetting rain.Zero percent. Transport winds.....Northeast 5 to 10 mph. Mixing Height.......1200-3200 ft agl. Smoke dispersal.....Poor. .Forecast days 3 through 7...... .TUESDAY NIGHT...Mostly clear. Lows in the lower 20s. Winds generally less than 10 mph. .WEDNESDAY...Partly cloudy. Lows in the lower 30s. Highs in the lower 50s. Winds generally less than 10 mph. .THURSDAY THROUGH FRIDAY...Partly cloudy with slight chance of showers and thunderstorms. Lows 32 to 37. Highs 57 to 62. Southwest winds around 10 mph. .SATURDAY...Partly cloudy. Lows in the upper 30s. Highs in the upper 60s. .SUNDAY...Mostly sunny. Highs in the lower 70s. $$ WYZ289-191245- Granite/Green/Ferris/Rattlesnake Mountains- Including the city of Jeffrey City 435 AM MDT Mon May 18 2026 ...WINTER STORM WARNING IN EFFECT UNTIL 6 PM MDT THIS EVENING... .TODAY... Sky/weather.........Cloudy. Blowing snow in the morning. Patchy blowing snow in the afternoon. Snow showers until late afternoon. Snow showers likely late in the afternoon, then chance of snow showers late in the afternoon. Snow accumulation of 1 to 10 inches. Chance of snow near 100 percent. Chance of thunder...0 percent. Max temperature.....28-33. 24 hr trend......22 degrees cooler. Min humidity........75-81 percent. 24 hr trend......48 percent wetter. 20-foot winds.......Windy. Northeast winds 25 to 30 mph with gusts to around 55 mph until 1500, then north around 15 mph with gusts to around 40 mph. Ridge top winds.....Northeast around 35 mph until 1200, then north around 25 mph. Chc of wetting rain.90 percent until 1200, then 35 percent. Transport winds.....Northeast around 40 mph until 1200, then around 30 mph. Mixing Height.......800-2600 ft agl. Smoke dispersal.....Fair to good. .TONIGHT... Sky/weather.........Mostly cloudy. Slight chance of snow showers in the evening. Patchy fog in the evening. Patchy fog early in the morning. Chance of snow 20 percent. Chance of thunder...0 percent. Min temperature.....17-22. 24 hr trend......5 degrees cooler. Max humidity........90-96 percent. 24 hr trend......2 percent drier. Humidity recovery...Excellent. 20-foot winds.......Northeast winds around 10 mph and gusty until 2100, then downslope/downvalley 4-7 mph. Ridge top winds.....Northeast around 10 mph until 2400, then west. Chc of wetting rain.Zero percent. Transport winds.....North 10 to 15 mph. Mixing Height.......400-2000 ft agl. Smoke dispersal.....Poor. .TUESDAY... Sky/weather.........Partly cloudy then becoming mostly sunny. Chance of thunder...0 percent. Max temperature.....35-40. 24 hr trend......7 degrees warmer. Min humidity........61-67 percent. 24 hr trend......17 percent drier. 20-foot winds.......Upslope/upvalley 5-9 mph. Ridge top winds.....Southwest around 10 mph. Chc of wetting rain.Zero percent. Transport winds.....Southwest 10 to 15 mph. Mixing Height.......800-2800 ft agl. Smoke dispersal.....Poor. .Forecast days 3 through 7...... .TUESDAY NIGHT...Mostly clear. Lows in the lower 20s. Winds generally less than 10 mph. .WEDNESDAY...Warmer. Partly cloudy. Lows in the lower 30s. Highs around 50. Winds generally less than 10 mph. .THURSDAY...Partly cloudy with slight chance of showers, thunderstorms and snow showers. Lows in the lower 30s. Highs in the lower 50s. Winds generally less than 10 mph. .FRIDAY...Partly cloudy with slight chance of showers and thunderstorms. Lows in the mid 30s. Highs in the upper 50s. Winds generally less than 10 mph. .SATURDAY...Partly cloudy. Lows around 40. Highs in the mid 60s. .SUNDAY...Mostly sunny. Highs in the lower 70s. $$ WYZ300-191245- Casper Mountain- 435 AM MDT Mon May 18 2026 ...WINTER STORM WARNING IN EFFECT UNTIL 6 PM MDT THIS EVENING... .TODAY... Sky/weather.........Cloudy. Blowing snow in the morning. Patchy blowing snow in the afternoon. Snow showers until late afternoon. Snow showers likely late in the afternoon. Snow accumulation of 4 to 12 inches. Chance of snow near 100 percent. Chance of thunder...0 percent. Max temperature.....28-33. 24 hr trend......23 degrees cooler. Min humidity........85-91 percent. 24 hr trend......38 percent wetter. 20-foot winds.......Breezy. Northeast winds 20 to 25 mph until 1500, then north around 15 mph. Gusts up to 40 mph. Ridge top winds.....Northeast 25 to 30 mph. Chc of wetting rain.90 percent until 1200, then 70 percent. Transport winds.....Northeast 25 to 30 mph. Mixing Height.......800-2600 ft agl. Smoke dispersal.....Poor to fair. .TONIGHT... Sky/weather.........Cloudy then becoming partly cloudy. Chance of snow showers early in the evening. Slight chance of snow showers late in the evening. Patchy fog in the evening. Chance of snow 50 percent. Chance of thunder...0 percent. Min temperature.....19-24. 24 hr trend......3 degrees cooler. Max humidity........89-95 percent. 24 hr trend......1 percent drier. Humidity recovery...Excellent. 20-foot winds.......North winds around 10 mph and gusty until 2100, then downslope/downvalley 4-7 mph. Ridge top winds.....North around 10 mph until 2400, then southwest. Chc of wetting rain.Zero percent. Transport winds.....North around 15 mph until 2400, then west. Mixing Height.......600-2000 ft agl. Smoke dispersal.....Poor. .TUESDAY... Sky/weather.........Partly cloudy then becoming mostly sunny. Chance of thunder...0 percent. Max temperature.....37-42. 24 hr trend......8 degrees warmer. Min humidity........62-68 percent. 24 hr trend......27 percent drier. 20-foot winds.......Upslope/upvalley 5-9 mph. Ridge top winds.....Southwest around 10 mph. Chc of wetting rain.Zero percent. Transport winds.....West around 10 mph. Mixing Height.......600-2000 ft agl. Smoke dispersal.....Poor. .Forecast days 3 through 7...... .TUESDAY NIGHT...Mostly clear. Lows in the lower 20s. Winds generally less than 10 mph. .WEDNESDAY...Mostly clear. Lows around 30. Highs in the upper 40s. Winds generally less than 10 mph. .THURSDAY...Partly cloudy with chance of showers, slight chance of thunderstorms and snow showers. Lows in the lower 30s. Highs around 50. Winds generally less than 10 mph. .FRIDAY...Partly cloudy with slight chance of showers, thunderstorms and snow showers. Lows in the mid 30s. Highs in the mid 50s. Winds generally less than 10 mph. .SATURDAY THROUGH SUNDAY...Mostly clear. Lows in the lower 40s. Highs 63 to 68. $$