FNUS55 KPIH 230829 FWFPIH Fire Weather Planning Forecast for Southeast Idaho National Weather Service Pocatello ID 229 AM MDT Sun Aug 23 2026 .DISCUSSION... * Central Idaho Dispatch Area weather impact summary (Zones 475 and 476)... ...Breezy afternoon will combine with low humidity in some areas to approach Critical Fire Weather conditions... Thunderstorms have ended for the most part in Zone 475, but will continue to be a threat in the eastern half of the dispatch area in Zone 476. Clearer skies will accompany the cooler and drier air that moved in last night. This will bring some humidity at lower elevations in the Salmon-to-Challis corridor to below 15 percent this afternoon. With a low moving through southern Canada increasing wind over mainly the ridges, some locations could be very close to critical fire weather thresholds today. Wind will decrease for Monday. * East Idaho Dispatch Area weather impact summary (Zones 410...411 and 413)... While cloud cover and the coverage of thunderstorms will diminish today, the air is still very unstable and the severity of the thunderstorms will be worse, with gusts in excess of 60 mph a strong possibility for this afternoon and evening. Cooler air settled in overnight and so temperatures for the next couple of days will be cooler, which will keep humidity from reaching critical thresholds. Wind will be gusty in the western portions of the Snake River plain for this afternoon, but should be calmer Monday. * South Central Idaho Dispatch Area weather impact summary (Zones 422...425 and 427)... While cloud cover and the coverage of thunderstorms will diminish today, the air is still very unstable and the severity of the thunderstorms will be worse, with gusts in excess of 60 mph a strong possibility for this afternoon and evening. Cooler air settled in overnight and so temperatures for the next couple of days will be cooler, which will keep humidity from reaching critical thresholds. IDZ475-232230- East Salmon River Mountains/Salmon NF- 229 AM MDT Sun Aug 23 2026 .Today... * Sky/weather........Mostly sunny. * Chc of thunder.....Zero. * Max Temperature....74-81 valleys. 65-72 ridges. 24 hr trend......5 degrees down. * Min Humidity.......16-24 percent. 24 hr trend......6 percent down. * 20ft wind.......... Valleys/lwr slopes...Southwest 10 to 15 mph. Ridges/upr slopes....Southwest 11 to 16 mph with gusts to 30 mph. * Chc Wetting Rain...Zero. * Mixing Height......12500-13500 ft AGL. * Transport Wind.....Southwest 15 mph increasing to 30 mph in the afternoon. .TONIGHT... * Sky/weather........Mostly clear. * Chc of thunder.....Zero. * Min Temperature....44-51. 24 hr trend......10 degrees down. * Max Humidity.......43-51 percent. 24 hr trend......17 percent down. * 20ft wind.......... Valleys/lwr slopes...West 8 to 13 mph. Ridges/upr slopes....West 8 to 13 mph. Gusts up to 25 mph decreasing to 15 mph after midnight. * Chc Wetting Rain...Zero. * Mixing Height......1000-2000 ft AGL. * Transport Wind.....West 15 mph in the evening. .MONDAY... * Sky/weather........Mostly sunny then becoming partly cloudy. * Chc of thunder.....Zero. * Max Temperature....76-83 valleys. 68-75 ridges. 24 hr trend......3 degrees up. * Min Humidity.......16-23 percent. 24 hr trend......Little change. * 20ft wind.......... Valleys/lwr slopes...Becoming west 3 to 9 mph in the afternoon. Ridges/upr slopes....Southwest 4 to 9 mph. Gusts up to 15 mph in the afternoon. * Chc Wetting Rain...Zero. * Mixing Height......11000-12000 ft AGL. * Transport Wind.....Becoming west 20 mph in the afternoon. .Forecast days 3 through 7...... .TUESDAY...Partly cloudy. Slight chance of showers. Lows 50 to 57. Highs 75 to 82. Southwest wind 5 to 10 mph with gusts to around 20 mph. .WEDNESDAY...Partly cloudy. Slight chance of showers and thunderstorms. Lows 51 to 58. Highs 73 to 80. South wind 10 to 15 mph with gusts to 20 mph. .THURSDAY...Partly cloudy. Slight chance of rain. Lows 50 to 57. Highs 72 to 79. South wind 10 to 15 mph with gusts to 25 mph. .FRIDAY...Partly cloudy. Lows in the lower 50s. Highs in the mid 70s. .SATURDAY...Mostly clear. Slight chance of rain. Lows around 50. Highs in the lower 70s. $$ IDZ476-232230- Lemhi and Lost River Range/Challis NF- 229 AM MDT Sun Aug 23 2026 .Today... * Sky/weather........Partly cloudy then becoming mostly sunny. * Chc of thunder.....Zero. * Max Temperature....78-85 valleys. 66-73 ridges. 24 hr trend......Little change. * Min Humidity.......14-22 percent valleys. 19-27 percent ridges. 24 hr trend......9 percent down. * 20ft wind.......... Valleys/lwr slopes...Southwest 8 to 18 mph. Ridges/upr slopes....Southwest 9 to 19 mph with gusts to 30 mph. * Chc Wetting Rain...Zero. * Mixing Height......12500-13500 ft AGL. * Transport Wind.....South 15 mph increasing to southwest 35 mph in the afternoon. .TONIGHT... * Sky/weather........Mostly clear. * Chc of thunder.....Zero. * Min Temperature....45-52. 24 hr trend......8 degrees down. * Max Humidity.......44-52 percent. 24 hr trend......25 percent down. * 20ft wind.......... Valleys/lwr slopes...West 11 to 16 mph decreasing to 2 to 7 mph after midnight. Ridges/upr slopes....West 12 to 17 mph with gusts to 30 mph decreasing to 2 to 8 mph after midnight. * Chc Wetting Rain...Zero. * Mixing Height......1250-2250 ft AGL. * Transport Wind.....West 20 mph in the evening. .MONDAY... * Sky/weather........Partly cloudy then becoming mostly cloudy. Slight chance of showers and thunderstorms in the afternoon. * Chc of thunder.....10 percent. * Max Temperature....78-85 valleys. 67-74 ridges. 24 hr trend......Little change. * Min Humidity.......15-23 percent valleys. 21-29 percent ridges. 24 hr trend......Little change. * 20ft wind.......... Valleys/lwr slopes...Becoming west 2 to 8 mph in the afternoon. Ridges/upr slopes....Southwest 4 to 9 mph. Gusts up to 20 mph in the afternoon. * Chc Wetting Rain...10 percent. * Mixing Height......11000-12000 ft AGL. * Transport Wind.....Southwest 10 mph increasing to west 20 mph in the afternoon. .Forecast days 3 through 7...... .TUESDAY...Partly cloudy. Slight chance of showers and thunderstorms. Lows 49 to 56. Highs 74 to 81. Southwest wind 5 to 10 mph with gusts to 20 mph. .WEDNESDAY...Mostly cloudy. Chance of showers and slight chance of thunderstorms. Lows 49 to 56. Highs 72 to 79. South wind 10 to 15 mph with gusts to 20 mph. .THURSDAY...Partly cloudy. Slight chance of rain. Lows 49 to 56. Highs 72 to 79. Southwest wind 10 to 15 mph with gusts to 30 mph. .FRIDAY...Partly cloudy with slight chance of rain. Lows around 50. Highs in the mid 70s. .SATURDAY...Partly cloudy. Slight chance of rain. Lows around 50. Highs in the lower 70s. $$ IDZ422-232230- Sawtooth Range/Northern Sawtooth NF- 229 AM MDT Sun Aug 23 2026 .Today... * Sky/weather........Mostly sunny. * Chc of thunder.....Zero. * Max Temperature....77-84 valleys. 65-72 ridges. 24 hr trend......Little change. * Min Humidity.......16-21 percent valleys. 18-25 percent ridges. 24 hr trend......10 percent down. * 20ft wind.......... Valleys/lwr slopes...Southwest 12 to 17 mph.Ridges/upr slopes....Southwest 12 to 17 mph with gusts to 30 mph. * Chc Wetting Rain...Zero. * Mixing Height......12250-13250 ft AGL. * Transport Wind.....South 15 mph increasing to southwest 30 mph in the afternoon. .TONIGHT... * Sky/weather........Mostly clear. * Chc of thunder.....Zero. * Min Temperature....46-53. 24 hr trend......7 degrees down. * Max Humidity.......40-48 percent. 24 hr trend......26 percent down. * 20ft wind.......... Valleys/lwr slopes...West 11 to 16 mph shifting to the north 2 to 8 mph after midnight. Ridges/upr slopes....West 9 to 14 mph. Gusts up to 25 mph in the evening. * Chc Wetting Rain...Zero. * Mixing Height......1000-2000 ft AGL. * Transport Wind.....West 10 to 15 mph. .MONDAY... * Sky/weather........Partly cloudy then becoming mostly cloudy. Slight chance of rain showers in the afternoon. * Chc of thunder.....Zero. * Max Temperature....78-85 valleys. 67-74 ridges. 24 hr trend......2 degrees up. * Min Humidity.......17-23 percent valleys. 21-29 percent ridges. 24 hr trend......3 percent up. * 20ft wind.......... Valleys/lwr slopes...Southwest 4 to 9 mph. Ridges/upr slopes....Southwest 4 to 9 mph with gusts to 20 mph. * Chc Wetting Rain...Zero. * Mixing Height......11000-12000 ft AGL. * Transport Wind.....Southwest 10 mph increasing to 20 mph in the afternoon. .Forecast days 3 through 7...... .TUESDAY...Partly cloudy. Slight chance of showers. Lows 49 to 56. Highs 76 to 83. Southwest wind 5 to 10 mph with gusts to around 20 mph. .WEDNESDAY...Partly cloudy. Slight chance of showers. Lows 50 to 57. Highs 75 to 82. South wind 10 to 15 mph with gusts to 20 mph. .THURSDAY...Partly cloudy. Lows 50 to 57. Highs 73 to 80. Southwest wind 10 to 15 mph with gusts to 25 mph. .FRIDAY...Partly cloudy. Lows in the lower 50s. Highs in the mid 70s. .SATURDAY...Mostly clear. Lows around 50. Highs in the lower 70s. $$ IDZ425-232230- Middle Snake River Valley/Twin Falls BLM north of the Snake River- 229 AM MDT Sun Aug 23 2026 .Today... * Sky/weather........Sunny. * Chc of thunder.....Zero. * Max Temperature....Around 89. 24 hr trend......Little change. * Min Humidity.......20-28 percent. 24 hr trend......Little change. * 20ft wind..........Southeast 3 to 9 mph with gusts to 15 mph shifting to the west 11 to 16 mph with gusts to 30 mph in the afternoon. * Chc Wetting Rain...Zero. * Mixing Height......12750-13750 ft AGL. * Transport Wind.....South 10 mph increasing to southwest 20 mph in the afternoon. .TONIGHT... * Sky/weather........Partly cloudy. * Chc of thunder.....Zero. * Min Temperature....Around 57. 24 hr trend......8 degrees down. * Max Humidity.......52-60 percent. 24 hr trend......12 percent down. * 20ft wind..........West 11 to 16 mph with gusts to 30 mph shifting to the northeast 2 to 6 mph after midnight. * Chc Wetting Rain...Zero. * Mixing Height......1250-2250 ft AGL. * Transport Wind.....West 10 mph in the evening. .MONDAY... * Sky/weather........Mostly cloudy. Slight chance of showers and thunderstorms in the afternoon. * Chc of thunder.....20 percent. * Max Temperature....Around 90. 24 hr trend......Little change. * Min Humidity.......20-28 percent. 24 hr trend......Little change. * 20ft wind..........East 1 to 5 mph shifting to the south 3 to 9 mph with gusts to 20 mph in the afternoon. * Chc Wetting Rain...10 percent. * Mixing Height......11500-12500 ft AGL. * Transport Wind.....Becoming southwest 10 mph in the afternoon. .Forecast days 3 through 7...... .TUESDAY...Mostly clear. Lows in the upper 50s. Highs in the lower 90s. Southeast wind 5 to 10 mph with gusts to 20 mph. .WEDNESDAY...Partly cloudy. Lows in the upper 50s. Highs in the lower 90s. East wind 5 to 10 mph with gusts to 20 mph. .THURSDAY...Partly cloudy. Lows around 60. Highs around 90. East winds 10 to 15 mph with gusts to 25 mph. .FRIDAY...Partly cloudy. Lows in the upper 50s. Highs in the upper 80s. .SATURDAY...Partly cloudy. Lows in the mid 50s. Highs in the mid 80s. $$ IDZ427-232230- Goose Creek and Raft River Valley/Southern Sawtooth NF/Twin Falls BLM south of the Snake River- 229 AM MDT Sun Aug 23 2026 .Today... * Sky/weather........Mostly sunny then becoming partly cloudy. Slight chance of showers and thunderstorms in the afternoon. * Chc of thunder.....20 percent. * Max Temperature....Around 87 valleys. 78-85 ridges. 24 hr trend......2 degrees down. * Min Humidity.......28-36 percent. 24 hr trend......3 percent up. * 20ft wind.......... Valleys/lwr slopes...South 2 to 8 mph shifting to the west 4 to 9 mph in the afternoon. Ridges/upr slopes....Southwest 3 to 9 mph shifting to the west 2 to 9 mph in the afternoon. Gusts up to 20 mph. * Chc Wetting Rain...10 percent. * Mixing Height......12500-13500 ft AGL. * Transport Wind.....South 10 mph increasing to 20 mph in the afternoon. .TONIGHT... * Sky/weather........Mostly cloudy then becoming partly cloudy. Slight chance of showers and thunderstorms in the evening. * Chc of thunder.....20 percent. * Min Temperature....56-63. 24 hr trend......4 degrees down. * Max Humidity.......57-65 percent. 24 hr trend......5 percent down. * 20ft wind.......... Valleys/lwr slopes...Southwest 2 to 8 mph. Ridges/upr slopes....South 2 to 8 mph with gusts to 15 mph. * Chc Wetting Rain...10 percent. * Mixing Height......1250-2250 ft AGL. * Transport Wind.....Southwest 10 mph in the evening becoming light. .MONDAY... * Sky/weather........Mostly cloudy. Chance of showers and thunderstorms in the afternoon. * Chc of thunder.....40 percent. * Max Temperature....Around 88 valleys. 79-86 ridges. 24 hr trend......Little change. * Min Humidity.......27-35 percent. 24 hr trend......Little change. * 20ft wind.......... Valleys/lwr slopes...South 1 to 5 mph shifting to the north 2 to 7 mph in the afternoon. Ridges/upr slopes....South 2 to 7 mph. Gusts up to 15 mph in the afternoon. * Chc Wetting Rain...10 percent. * Mixing Height......11500-12500 ft AGL. * Transport Wind.....Becoming south 10 mph in the afternoon. .Forecast days 3 through 7...... .TUESDAY...Partly cloudy. Chance of showers and slight chance of thunderstorms. Lows 55 to 62. Highs 82 to 89. South wind 5 to 10 mph with gusts to 15 mph. .WEDNESDAY...Partly cloudy. Lows 57 to 64. Highs 82 to 89. South winds 5 to 10 mph with gusts to 15 mph. .THURSDAY...Partly cloudy. Lows 58 to 65. Highs 81 to 88. Southwest wind 5 to 10 mph with gusts to 20 mph. .FRIDAY...Partly cloudy with slight chance of rain. Lows around 60. Highs in the lower 80s. .SATURDAY...Partly cloudy with slight chance of rain. Lows in the upper 50s. Highs in the lower 80s. $$ IDZ410-232230- Upper Snake River Valley/Idaho Falls BLM- 229 AM MDT Sun Aug 23 2026 .Today... * Sky/weather........Partly cloudy then becoming mostly sunny. Slight chance of showers and thunderstorms in the afternoon. * Chc of thunder.....10 percent. * Max Temperature....82-89. 24 hr trend......Little change. * Min Humidity.......21-29 percent. 24 hr trend......4 percent down. * 20ft wind..........Southeast 2 to 8 mph with gusts to 15 mph increasing to southwest 13 to 18 mph with gusts to 30 mph in the afternoon. * Chc Wetting Rain...Zero. * Mixing Height......12000-13000 ft AGL. * Transport Wind.....South 10 mph increasing to southwest 20 mph in the afternoon. .TONIGHT... * Sky/weather........Partly cloudy. Slight chance of rain showers in the evening. * Chc of thunder.....Zero. * Min Temperature....50-57. 24 hr trend......6 degrees down. * Max Humidity.......57-65 percent. 24 hr trend......11 percent down. * 20ft wind..........Southwest 13 to 18 mph with gusts to 30 mph decreasing to 3 to 9 mph with gusts to 15 mph after midnight. * Chc Wetting Rain...Zero. * Mixing Height......1000-2000 ft AGL. * Transport Wind.....Southwest 10 to 15 mph. .MONDAY... * Sky/weather........Partly cloudy then becoming mostly cloudy. * Chc of thunder.....Zero. * Max Temperature....81-88. 24 hr trend......Little change. * Min Humidity.......19-27 percent. 24 hr trend......Little change. * 20ft wind..........East 2 to 6 mph shifting to the southwest 3 to 9 mph with gusts to 15 mph in the afternoon. * Chc Wetting Rain...Zero. * Mixing Height......10750-11750 ft AGL. * Transport Wind.....Becoming southwest 15 mph in the afternoon. .Forecast days 3 through 7...... .TUESDAY...Partly cloudy. Slight chance of showers. Lows 51 to 58. Highs 82 to 89. South wind 5 to 10 mph with gusts to 20 mph. .WEDNESDAY...Partly cloudy. Lows 52 to 59. Highs 82 to 89. Northeast wind 5 to 10 mph with gusts to 20 mph. .THURSDAY...Partly cloudy. Lows 51 to 58. Highs 81 to 88. Northeast wind 10 to 15 mph with gusts to 25 mph. .FRIDAY...Partly cloudy. Lows in the mid 50s. Highs in the lower 80s. .SATURDAY...Partly cloudy. Lows in the lower 50s. Highs in the lower 80s. $$ IDZ411-232230- Centennial Mountains and Snake River Range/Targhee NF- 229 AM MDT Sun Aug 23 2026 .Today... * Sky/weather........Partly cloudy. Slight chance of showers and thunderstorms in the afternoon. * Chc of thunder.....20 percent. * Max Temperature....Around 82 valleys. 72-79 ridges. 24 hr trend......Little change. * Min Humidity.......32-40 percent. 24 hr trend......2 percent down. * 20ft wind.......... Valleys/lwr slopes...Southwest 9 to 14 mph. Ridges/upr slopes....Southwest 10 to 15 mph. Gusts up to 15 mph increasing to 25 mph in the afternoon. * Chc Wetting Rain...10 percent. * Mixing Height......11000-12000 ft AGL. * Transport Wind.....South 10 mph increasing to southwest 25 mph in the afternoon. .TONIGHT... * Sky/weather........Partly cloudy. * Chc of thunder.....Zero. * Min Temperature....47-54. 24 hr trend......5 degrees down. * Max Humidity.......77-85 percent valleys. 59-67 percent ridges. 24 hr trend......14 percent down. * 20ft wind.......... Valleys/lwr slopes...Southwest 5 to 11 mph shifting to the east 1 to 5 mph after midnight. Ridges/upr slopes....Southwest 8 to 13 mph. Gusts up to 25 mph decreasing to 15 mph after midnight. * Chc Wetting Rain...Zero. * Mixing Height......1250-2250 ft AGL. * Transport Wind.....Southwest 10 to 15 mph. .MONDAY... * Sky/weather........Partly cloudy.Slight chance of showers and thunderstorms in the afternoon. * Chc of thunder.....10 percent. * Max Temperature....Around 82 valleys. 71-78 ridges. 24 hr trend......Little change. * Min Humidity.......28-36 percent. 24 hr trend......7 percent down. * 20ft wind.......... Valleys/lwr slopes...Becoming southwest 2 to 7 mph in the afternoon. Ridges/upr slopes....Southwest 2 to 8 mph. Gusts up to 15 mph in the afternoon. * Chc Wetting Rain...Zero. * Mixing Height......9750-10750 ft AGL. * Transport Wind.....South 10 mph increasing to southwest 25 mph in the afternoon. .Forecast days 3 through 7...... .TUESDAY...Partly cloudy. Slight chance of showers and thunderstorms. Lows 48 to 55. Highs 72 to 79. South wind 5 to 10 mph with gusts to 20 mph. .WEDNESDAY...Partly cloudy. Slight chance of showers. Lows 48 to 55. Highs 73 to 80. East wind 5 to 10 mph with gusts to 20 mph. .THURSDAY...Partly cloudy. Slight chance of showers and thunderstorms. Lows 48 to 55. Highs 72 to 79. Southeast wind 10 to 15 mph with gusts to 25 mph. .FRIDAY...Partly cloudy with slight chance of showers and thunderstorms. Lows around 50. Highs in the lower 70s. .SATURDAY...Partly cloudy with slight chance of showers and thunderstorms. Lows around 50. Highs in the lower 70s. $$ IDZ413-232230- Caribou Range/Caribou NF- 229 AM MDT Sun Aug 23 2026 .Today... * Sky/weather........Mostly sunny then becoming partly cloudy. Slight chance of showers and thunderstorms in the afternoon. * Chc of thunder.....20 percent. * Max Temperature....82-89 valleys. 75-82 ridges. 24 hr trend......Little change. * Min Humidity.......28-36 percent. 24 hr trend......Little change. * 20ft wind.......... Valleys/lwr slopes...South 2 to 8 mph shifting to the southwest 4 to 10 mph in the afternoon. Ridges/upr slopes....Southwest 5 to 10 mph with gusts to 20 mph. * Chc Wetting Rain...10 percent. * Mixing Height......12250-13250 ft AGL. * Transport Wind.....South 10 mph increasing to 20 mph in the afternoon. .TONIGHT... * Sky/weather........Mostly cloudy then becoming partly cloudy. Slight chance of showers and thunderstorms in the evening. * Chc of thunder.....20 percent. * Min Temperature....53-60. 24 hr trend......4 degrees down. * Max Humidity.......67-75 percent. 24 hr trend......5 percent down. * 20ft wind.......... Valleys/lwr slopes...Southwest 3 to 9 mph shifting to the southeast 2 to 6 mph after midnight. Ridges/upr slopes....South 4 to 9 mph. Gusts up to 20 mph in the evening. * Chc Wetting Rain...20 percent. * Mixing Height......1250-2250 ft AGL. * Transport Wind.....South 10 mph. .MONDAY... * Sky/weather........Partly cloudy. Slight chance of showers and thunderstorms in the afternoon. * Chc of thunder.....20 percent. * Max Temperature....81-88 valleys. 74-81 ridges. 24 hr trend......Little change. * Min Humidity.......29-37 percent. 24 hr trend......Little change. * 20ft wind.......... Valleys/lwr slopes...Southeast 1 to 5 mph shifting to the west 2 to 7 mph in the afternoon. Ridges/upr slopes....South 2 to 6 mph shifting to the west 2 to 8 mph with gusts to 15 mph in the afternoon. * Chc Wetting Rain...10 percent. * Mixing Height......11500-12500 ft AGL. * Transport Wind.....Becoming southwest 15 mph in the afternoon. .Forecast days 3 through 7...... .TUESDAY...Partly cloudy. Slight chance of showers. Lows 51 to 58. Highs 80 to 87. East wind 5 to 10 mph with gusts to 15 mph. .WEDNESDAY...Partly cloudy. Lows 53 to 60. Highs 80 to 87. East winds 5 to 10 mph with gusts to 20 mph. .THURSDAY...Partly cloudy. Lows 53 to 60. Highs 80 to 87. Southeast wind 10 to 15 mph with gusts to 20 mph. .FRIDAY...Partly cloudy. Lows in the mid 50s. Highs around 80. .SATURDAY...Partly cloudy with slight chance of showers and thunderstorms. Lows in the mid 50s. Highs in the upper 70s. $$ .OUTLOOK from Sunday August 30 to Saturday September 5: Moderate confidence of above normal temperatures. Weak confidence of near normal precipitation. Messick $$