FNUS75 KRIW 181034 FWSRIW Spot Forecast for WIND RIVER CANYON...WRA National Weather Service Riverton WY 434 AM MDT Mon May 18 2026 Forecast is based on forecast start time of 0700 MDT on May 18. If conditions become unrepresentative, contact the National Weather Service .DISCUSSION... Snow will continue through the morning hours with north wind gusts of 40 to 50 mph. Winds will begin to decrease after 1100, with gusts around 25 mph expected by 1500. Snow will be ending by this time as well, with a 20% chance for any precipitation between 1500 and 1800. Winds will continue to decrease through the evening, becoming light (10 mph or less) after 2200. Clouds will scatter out after midnight with clear skies expected by sunrise. There is a 30 to 60% chance for fog to develop Tuesday morning as a result of these clear skies. Dry and warming conditions will be in place Tuesday and Wednesday. ...Thunderstorms imply strong gusty and erratic winds... .TODAY... Sky/weather.........Mostly cloudy (80-90 percent). Blowing snow in the morning. Snow showers in the morning, then chance of rain showers in the afternoon. CWR.................80 percent decreasing to 20 percent in the afternoon. Chance of pcpn......90 percent. Chance of thunder...7 percent. Max temperature.....Around 45. Min humidity........56 percent. Wind (20 ft)........Breezy. North winds 18 to 27 mph with gusts to around 38 mph until 1400, then 12 to 17 mph with gusts to around 23 mph. Ridgetop wind.......North 35 to 40 mph until 1200. Around 20 mph after 1600. Mixing height.......3000 ft AGL until 1500, then 3500 ft AGL. Transport winds.....North 31 to 38 mph until 1300, then 20 to 28 mph. Smoke dispersal.....Fair until 0900, then good. TIME (MDT) 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM Sky (%).........95 95 95 95 95 95 90 85 80 75 80 Weather cov.....DEF DEF DEF DEF LKY LKY CHC CHC CHC CHC SCH Weather type....SW SW SW BSN SW SW SW SW RS RS RS Tstm cov........ CWR.............80 80 80 80 80 20 20 20 20 20 20 Chc of pcpn (%).90 90 80 70 60 60 50 40 40 30 20 Chc of thdr (%).0 0 0 0 0 0 0 0 10 10 10 Temp............29 30 30 31 32 38 40 41 42 44 44 RH..............100 96 96 96 92 82 79 74 74 69 63 20 FT wind dir..N N N N N N N N N N N 20 FT wind spd..27 27 27 27 24 21 18 17 15 13 12 20 FT wind gust.38 38 38 38 33 30 26 23 20 18 17 Ridge wind dir..N N N N N N N N N N N Ridge wind spd..40 40 40 40 35 30 30 25 25 20 20 Mix hgt (kft)...1.5 1.5 2.5 2.5 2.5 2.5 3.0 3.0 3.5 3.5 3.5 Transp wind dir.N N N N N N N N N N N Transp wind spd.38 38 38 38 35 31 28 25 23 21 20 SDspl kt-ft/100049 53 75 74 72 74 70 71 70 67 63 .TONIGHT... Sky/weather.........Mostly cloudy (65-75 percent) then becoming partly cloudy (30-40 percent). CWR.................0 percent. Chance of pcpn......10 percent. Chance of thunder...3 percent. Min temperature.....Around 30. Max humidity........76 percent. Wind (20 ft)........North winds 7 to 12 mph with gusts to around 17 mph until 2200, then light. Ridgetop wind.......North 15 to 20 mph until 2300, then northwest around 10 mph until 0100, then northeast until 0300, then southeast. Mixing height.......2000 ft AGL until 2000, then 500 ft AGL. Transport winds.....North 13 to 20 mph until 2300, then 9 to 10 mph until 0200, then southwest around 9 mph until 0300, then north. Smoke dispersal.....Good until 1900. Poor after 2000. TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM Sky (%).........75 75 80 60 50 35 35 35 25 15 25 25 Weather cov..... Weather type.... Tstm cov........ CWR.............0 0 0 0 0 0 0 0 0 0 0 0 Chc of pcpn (%).10 0 0 0 0 0 0 0 0 0 0 0 Chc of thdr (%).0 0 0 0 0 0 0 0 0 0 0 0 Temp............44 44 40 39 37 38 36 34 34 32 32 32 RH..............63 62 59 60 64 64 69 73 75 76 75 75 20 FT wind dir..N N N N N NW N NE NE SE SE S 20 FT wind spd..12 10 8 7 6 5 5 4 4 4 4 4 20 FT wind gust.17 14 12 10 10 6 6 6 6 6 6 6 Ridge wind dir..N N N N N NW N NE NE SE SE S Ridge wind spd..20 15 15 15 15 10 10 10 10 10 10 10 Mix hgt (kft)...3.5 2.0 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Transp wind dir.N N N N N N N N SW N N N Transp wind spd.20 17 15 14 13 10 10 9 9 9 9 9 SDspl kt-ft/100062 33 9 6 6 5 5 3 3 4 3 4 .TUESDAY... Sky/weather.........Sunny (15-25 percent). CWR.................0 percent. Chance of pcpn......0 percent. Chance of thunder...0 percent. Max temperature.....Around 56. Min humidity........35 percent. Wind (20 ft)........Light winds until 0900, then south 7 to 12 mph with gusts to around 17 mph. Ridgetop wind.......South 10 to 15 mph until 1700, then around 20 mph. Mixing height.......1500 ft AGL until 1000. 5500 ft AGL after 1400. Transport winds.....Northwest around 9 mph until 0700, then south 12 to 20 mph. Smoke dispersal.....Poor until 0900. Good after 1500. TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM Sky (%).........25 25 20 15 15 15 10 15 15 15 20 20 Weather cov..... Weather type.... Tstm cov........ CWR.............0 0 0 0 0 0 0 0 0 0 0 0 Chc of pcpn (%).0 0 0 0 0 0 0 0 0 0 0 0 Chc of thdr (%).0 0 0 0 0 0 0 0 0 0 0 0 Temp............31 33 36 39 44 48 50 53 54 55 55 55 RH..............75 75 71 66 62 56 52 47 41 40 37 35 20 FT wind dir..S S S S S S S S S S S S 20 FT wind spd..4 6 6 7 7 7 7 7 8 9 10 12 20 FT wind gust.6 7 10 10 10 10 10 10 12 13 14 17 Ridge wind dir..S S S S S S S S S S S S Ridge wind spd..10 10 15 15 15 15 15 15 15 15 15 20 Mix hgt (kft)...0.5 0.5 1.0 1.5 2.5 3.0 3.5 4.0 5.5 5.5 5.5 5.5 Transp wind dir.NW S S S S S S S S S S S Transp wind spd.9 12 13 14 14 14 14 14 15 16 17 20 SDspl kt-ft/10004 6 13 20 29 35 43 51 70 77 86 91 .FORECAST DAYS 3 THROUGH 5... .WEDNESDAY... Mostly clear. Lows in the lower 30s. Highs in the mid 60s. South winds around 10 mph. .THURSDAY... Mostly cloudy. Chance of showers and slight chance of thunderstorms. Lows in the upper 30s. Highs around 60. North winds around 11 mph. .FRIDAY... Partly cloudy. Slight chance of showers and thunderstorms. Lows in the upper 30s. Highs in the upper 60s. Southeast winds around 8 mph. $$ Forecaster...LaVoie Requested by...Aubrey Williams Type of request...WILDFIRE .TAG 2613862.1/RIW .DELDT 05/18/26 .FormatterVersion 2.0.0 .EMAIL jacob.binns@bia.gov,wycdc@firenet.gov