Routine Fire Wx Fcst (With/Without 6-10 Day Outlook)
Issued by NWS Pocatello, ID
Issued by NWS Pocatello, ID
679
FNUS55 KPIH 100854
FWFPIH
Fire Weather Planning Forecast for Southeast Idaho
National Weather Service Pocatello ID
254 AM MDT Thu Sep 10 2026
...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 8 PM MDT THIS
EVENING FIRE WEATHER ZONE 410 FOR LOW HUMIDITY AND GUSTY WIND...
.DISCUSSION...
* Central Idaho Dispatch Area weather impact summary (Zones 475
and 476)...
...Wind and humidity approaching critical conditions today...
Low pressure moving through southern Canada will bring windy conditions
today that will combine with the very low afternoon humidity readings
to produce critical fire weather conditions. Cooler temperatures and
higher humidity readings will develop as early as Friday, reducing the
area of humidity below 15 percent, while gusty wind continues.
Showers and thunderstorms will bring humidity much higher and, by
Sunday, much cooler temperatures.
* East Idaho Dispatch Area weather impact summary (Zones 410...411
and 413)...
...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 8 PM MDT THIS
EVENING FIRE WEATHER ZONE 410 FOR LOW HUMIDITY AND GUSTY WIND...
Low pressure moving through southern Canada will bring windy conditions
today that will combine with the very low afternoon humidity readings
to produce critical fire weather conditions. Cooler temperatures and
higher humidity readings will develop as early as Friday, reducing the
area of humidity below 15 percent, while gusty wind continues.
Showers and thunderstorms will bring humidity much higher and, by
Sunday, much cooler temperatures.
* South Central Idaho Dispatch Area weather impact summary (Zones
422...425 and 427)...
...Wind and humidity approaching critical conditions today...
Low pressure moving through southern Canada will bring windy conditions
today that will combine with the very low afternoon humidity readings
to produce critical fire weather conditions. Cooler temperatures and
higher humidity readings will develop as early as Friday, reducing the
area of humidity below 15 percent, while gusty wind continues.
Showers and thunderstorms will bring humidity much higher and, by
Sunday, much cooler temperatures.
IDZ475-102315-
East Salmon River Mountains/Salmon NF-
254 AM MDT Thu Sep 10 2026
.Today...
* Sky/weather........Sunny.
* Chc of thunder.....Zero.
* Max Temperature....70-77 valleys. 61-68 ridges.
24 hr trend......4 degrees up.
* Min Humidity.......17-25 percent.
24 hr trend......3 percent down.
* 20ft wind..........
Valleys/lwr slopes...Southwest 8 to 13 mph.
Ridges/upr slopes....Southwest 9 to 14 mph. Gusts up to 15 mph
increasing to 25 mph in the afternoon.
* Chc Wetting Rain...Zero.
* Mixing Height......12500-13500 ft AGL.
* Transport Wind.....Southwest 10 mph increasing to
25 mph in the afternoon.
.TONIGHT...
* Sky/weather........Mostly clear.
* Chc of thunder.....Zero.
* Min Temperature....42-49.
24 hr trend......2 degrees up.
* Max Humidity.......59-67 percent valleys. 63-71 percent ridges.
24 hr trend......Little change.
* 20ft wind..........
Valleys/lwr slopes...West 7 to 12 mph.
Ridges/upr slopes....West 7 to 12 mph gusts to 25 mph.
* Chc Wetting Rain...Zero.
* Mixing Height......1000-2000 ft AGL.
* Transport Wind.....West 10 to 15 mph.
.FRIDAY...
* Sky/weather........Mostly sunny.
* Chc of thunder.....Zero.
* Max Temperature....63-70 valleys. 55-62 ridges.
24 hr trend......7 degrees down.
* Min Humidity.......20-28 percent.
24 hr trend......Little change.
* 20ft wind..........
Valleys/lwr slopes...West 6 to 11 mph.
Ridges/upr slopes....West 7 to 12 mph gusts to 25 mph.
* Chc Wetting Rain...Zero.
* Mixing Height......14000-15500 ft AGL.
* Transport Wind.....West 10 mph increasing to 25 mph
in the afternoon.
.Forecast days 3 through 7......
.SATURDAY...Mostly clear. Lows 38 to 45. Highs 65 to 72.
Southwest wind 10 to 15 mph gusts to 25 mph.
.SUNDAY...Much cooler. Rain, snow likely and slight chance of
thunderstorms. Lows 36 to 43. Highs 44 to 51. Southwest wind
10 to 20 mph gusts to 30 mph.
.MONDAY...Partly cloudy. Lows 30 to 37. Highs 50 to 57. West
winds 5 to 10 mph gusts to 20 mph.
.TUESDAY...Mostly clear. Lows in the mid 30s. Highs in the upper
50s.
.WEDNESDAY...Mostly clear. Lows in the upper 30s. Highs around
60.
$$
IDZ476-102315-
Lemhi and Lost River Range/Challis NF-
254 AM MDT Thu Sep 10 2026
.Today...
* Sky/weather........Sunny then becoming partly cloudy.
* Chc of thunder.....Zero.
* Max Temperature....73-80 valleys. 62-69 ridges.
24 hr trend......4 degrees up.
* Min Humidity.......12-17 percent valleys. 13-21 percent ridges.
24 hr trend......3 percent down.
* 20ft wind..........
Valleys/lwr slopes...Southwest 10 to 15 mph.
Ridges/upr slopes....Southwest 11 to 16 mph. Gusts up to 15 mph
increasing to 25 mph in the afternoon.
* Chc Wetting Rain...Zero.
* Mixing Height......12500-13500 ft AGL.
* Transport Wind.....Southwest 10 mph increasing to
25 mph in the afternoon.
.TONIGHT...
* Sky/weather........Mostly clear.
* Chc of thunder.....Zero.
* Min Temperature....42-49.
24 hr trend......2 degrees up.
* Max Humidity.......58-66 percent.
24 hr trend......4 percent up.
* 20ft wind..........
Valleys/lwr slopes...Southwest 9 to 14 mph.
Ridges/upr slopes....Southwest 9 to 14 mph gusts to 25 mph.
* Chc Wetting Rain...Zero.
* Mixing Height......1250-2250 ft AGL.
* Transport Wind.....Southwest 10 to 15 mph.
.FRIDAY...
* Sky/weather........Mostly sunny.
* Chc of thunder.....Zero.
* Max Temperature....68-75 valleys. 58-65 ridges.
24 hr trend......4 degrees down.
* Min Humidity.......14-22 percent.
24 hr trend......Little change.
* 20ft wind..........
Valleys/lwr slopes...West 10 to 15 mph.
Ridges/upr slopes....West 11 to 16 mph. Gusts up to 20 mph
increasing to 30 mph in the afternoon.
* Chc Wetting Rain...Zero.
* Mixing Height......14250-15750 ft AGL.
* Transport Wind.....West 15 mph increasing to 25 mph
in the afternoon.
.Forecast days 3 through 7......
.SATURDAY...Mostly clear. Lows 39 to 46. Highs 66 to 73.
Southwest wind 10 to 20 mph gusts to 30 mph.
.SUNDAY...Cooler, windy. Partly cloudy. Chance of showers, snow
and slight chance of thunderstorms. Lows 37 to 44. Highs 48 to
55. Southwest wind 20 to 30 mph gusts to 40 mph.
.MONDAY...Mostly clear. Lows 28 to 35. Highs 51 to 58. West wind
10 to 15 mph gusts to 25 mph.
.TUESDAY...Mostly clear. Lows in the mid 30s. Highs around 60.
.WEDNESDAY...Mostly clear. Lows in the upper 30s. Highs in the
lower 60s.
$$
IDZ422-102315-
Sawtooth Range/Northern Sawtooth NF-
254 AM MDT Thu Sep 10 2026
.Today...
* Sky/weather........Sunny then becoming partly cloudy.
* Chc of thunder.....Zero.
* Max Temperature....72-79 valleys. 60-67 ridges.
24 hr trend......2 degrees up.
* Min Humidity.......13-21 percent valleys. 18-26 percent ridges.
24 hr trend......Little change.
* 20ft wind..........
Valleys/lwr slopes...West 10 to 15 mph.
Ridges/upr slopes....West 10 to 15 mph. Gusts up to 15 mph
increasing to 25 mph in the afternoon.
* Chc Wetting Rain...Zero.
* Mixing Height......12500-13500 ft AGL.
* Transport Wind.....West 10 mph increasing to 25 mph
in the afternoon.
.TONIGHT...
* Sky/weather........Mostly clear.
* Chc of thunder.....Zero.
* Min Temperature....43-50.
24 hr trend......4 degrees up.
* Max Humidity.......58-66 percent valleys. 62-70 percent ridges.
24 hr trend......9 percent up.
* 20ft wind..........
Valleys/lwr slopes...West 9 to 14 mph.
Ridges/upr slopes....West 9 to 14 mph gusts to 25 mph.
* Chc Wetting Rain...Zero.
* Mixing Height......1000-2000 ft AGL.
* Transport Wind.....West 10 to 15 mph.
.FRIDAY...
* Sky/weather........Mostly sunny.
* Chc of thunder.....Zero.
* Max Temperature....68-75 valleys. 55-62 ridges.
24 hr trend......4 degrees down.
* Min Humidity.......13-21 percent valleys. 19-27 percent ridges.
24 hr trend......Little change.
* 20ft wind..........
Valleys/lwr slopes...West 12 to 17 mph.
Ridges/upr slopes....West 12 to 17 mph gusts to 25 mph.
* Chc Wetting Rain...Zero.
* Mixing Height......13500-15000 ft AGL.
* Transport Wind.....West 15 mph increasing to 25 mph
in the afternoon.
.Forecast days 3 through 7......
.SATURDAY...Mostly clear. Lows 40 to 47. Highs 66 to 73.
Southwest wind 10 to 20 mph gusts to 30 mph.
.SUNDAY...Cooler, breezy. Partly cloudy. Chance of showers, snow
and slight chance of thunderstorms. Lows 35 to 42. Highs 46 to
53. Southwest wind 15 to 25 mph gusts to 40 mph.
.MONDAY...Clear. Lows 27 to 34. Highs 52 to 59. Northwest wind
10 to 20 mph gusts to 30 mph.
.TUESDAY...Clear. Lows in the mid 30s. Highs in the lower 60s.
.WEDNESDAY...Mostly clear. Lows in the upper 30s. Highs in the
mid 60s.
$$
IDZ425-102315-
Middle Snake River Valley/Twin Falls BLM north of the Snake River-
254 AM MDT Thu Sep 10 2026
.Today...
* Sky/weather........Mostly sunny then becoming partly cloudy.
* Chc of thunder.....Zero.
* Max Temperature....Around 84.
24 hr trend......5 degrees up.
* Min Humidity.......13-18 percent.
24 hr trend......3 percent down.
* 20ft wind..........East 2 to 7 mph gusts to 15
mph shifting to the southwest 11 to 16 mph
gusts to 30 mph in the afternoon.
* Chc Wetting Rain...Zero.
* Mixing Height......11500-12500 ft AGL.
* Transport Wind.....Becoming west 20 mph in the afternoon.
.TONIGHT...
* Sky/weather........Mostly cloudy then becoming partly cloudy.
* Chc of thunder.....Zero.
* Min Temperature....52-58.
24 hr trend......11 degrees up.
* Max Humidity.......58-66 percent.
24 hr trend......3 percent down.
* 20ft wind..........West 12 to 17 mph gusts to
30 mph shifting to the southwest 2 to 8 mph
gusts to 15 mph after midnight.
* Chc Wetting Rain...Zero.
* Mixing Height......1250-2250 ft AGL.
* Transport Wind.....West 10 mph.
.FRIDAY...
* Sky/weather........Partly cloudy then becoming mostly sunny.
* Chc of thunder.....Zero.
* Max Temperature....Around 80.
24 hr trend......4 degrees down.
* Min Humidity.......19-27 percent.
24 hr trend......6 percent up.
* 20ft wind..........West 14 to 19 mph. Gusts up to 25 mph
increasing to 35 mph in the afternoon.
* Chc Wetting Rain...Zero.
* Mixing Height......13750-15250 ft AGL.
* Transport Wind.....West 15 mph increasing to 25 mph
in the afternoon.
.Forecast days 3 through 7......
.SATURDAY...Mostly clear. Lows around 50. Highs in the mid 80s.
West wind 10 to 20 mph gusts to 35 mph.
.SUNDAY...Cooler, breezy. Partly cloudy. Lows in the upper 40s.
Highs in the mid 60s. West wind 15 to 25 mph gusts to
around 40 mph.
.MONDAY...Clear. Lows in the upper 30s. Highs in the upper 60s.
West wind 10 to 20 mph gusts to 30 mph.
.TUESDAY...Clear. Lows around 40. Highs in the mid 70s.
.WEDNESDAY...Mostly clear. Lows in the mid 40s. Highs in the
upper 70s.
$$
IDZ427-102315-
Goose Creek and Raft River Valley/Southern Sawtooth NF/Twin Falls
BLM south of the Snake River-
254 AM MDT Thu Sep 10 2026
.Today...
* Sky/weather........Partly cloudy then becoming mostly cloudy.
* Chc of thunder.....Zero.
* Max Temperature....Around 84 valleys. 75-82 ridges.
24 hr trend......6 degrees up.
* Min Humidity.......13-18 percent.
24 hr trend......3 percent down.
* 20ft wind..........
Valleys/lwr slopes...South 3 to 9 mph shifting to the west 5 to
10 mph in the afternoon.
Ridges/upr slopes....Southwest 7 to 12 mph. Gusts up to 15 mph
increasing to 25 mph in the afternoon.
* Chc Wetting Rain...Zero.
* Mixing Height......11500-12500 ft AGL.
* Transport Wind.....Southwest 10 mph increasing to west
20 mph in the afternoon.
.TONIGHT...
* Sky/weather........Mostly cloudy. Slight chance of rain showers
after midnight.
* Chc of thunder.....Zero.
* Min Temperature....54-61.
24 hr trend......8 degrees up.
* Max Humidity.......58-66 percent valleys. 53-61 percent ridges.
24 hr trend......13 percent up.
* 20ft wind..........
Valleys/lwr slopes...Southwest 6 to 11 mph.
Ridges/upr slopes....Southwest 6 to 11 mph gusts to 20 mph.
* Chc Wetting Rain...10 percent.
* Mixing Height......1250-2250 ft AGL.
* Transport Wind.....Southwest 15 mph.
.FRIDAY...
* Sky/weather........Partly cloudy.
* Chc of thunder.....Zero.
* Max Temperature....Around 80 valleys. 71-78 ridges.
24 hr trend......4 degrees down.
* Min Humidity.......23-31 percent.
24 hr trend......10 percent up.
* 20ft wind..........
Valleys/lwr slopes...West 6 to 11 mph.
Ridges/upr slopes....West 6 to 11 mph gusts to 20 mph.
* Chc Wetting Rain...Zero.
* Mixing Height......14750-16250 ft AGL.
* Transport Wind.....West 15 mph increasing to 25 mph
in the afternoon.
.Forecast days 3 through 7......
.SATURDAY...Mostly clear. Lows 49 to 56. Highs 78 to 85.
Southwest wind 10 to 20 mph gusts to 35 mph.
.SUNDAY...Cooler, windy. Mostly clear. Lows 43 to 50. Highs 58 to
65. West wind 20 to 30 mph gusts to 45 mph.
.MONDAY...Clear. Lows 34 to 41. Highs 60 to 67. West wind 10 to
20 mph gusts to 30 mph.
.TUESDAY...Mostly clear. Lows around 40. Highs in the lower 70s.
.WEDNESDAY...Mostly clear. Lows in the mid 40s. Highs in the mid
70s.
$$
IDZ410-102315-
Upper Snake River Valley/Idaho Falls BLM-
254 AM MDT Thu Sep 10 2026
...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 8 PM MDT THIS
EVENING FOR LOW HUMIDITY AND GUSTY WIND...
.Today...
* Sky/weather........Sunny then becoming partly cloudy.
* Chc of thunder.....Zero.
* Max Temperature....74-81.
24 hr trend......4 degrees up.
* Min Humidity.......12-17 percent.
24 hr trend......2 percent down.
* 20ft wind..........Southwest 12 to 17 mph. Gusts up to 15
mph increasing to 30 mph in the afternoon.
* Chc Wetting Rain...Zero.
* Mixing Height......12250-13250 ft AGL.
* Transport Wind.....South 10 mph increasing to southwest
20 mph in the afternoon.
.TONIGHT...
* Sky/weather........Partly cloudy then becoming mostly cloudy.
Slight chance of rain showers after midnight.
* Chc of thunder.....Zero.
* Min Temperature....48-55.
24 hr trend......10 degrees up.
* Max Humidity.......64-72 percent.
24 hr trend......5 percent up.
* 20ft wind..........Southwest 13 to 18 mph. Gusts up to 30
mph decreasing to 20 mph after midnight.
* Chc Wetting Rain...Zero.
* Mixing Height......1250-2250 ft AGL.
* Transport Wind.....Southwest 10 to 15 mph.
.FRIDAY...
* Sky/weather........Partly cloudy then becoming mostly sunny.
* Chc of thunder.....Zero.
* Max Temperature....73-80.
24 hr trend......2 degrees down.
* Min Humidity.......13-18 percent.
24 hr trend......2 percent up.
* 20ft wind..........Southwest 11 to 21 mph gusts to 30 mph.
* Chc Wetting Rain...Zero.
* Mixing Height......14750-16250 ft AGL.
* Transport Wind.....Southwest 15 mph increasing to west
30 mph in the afternoon.
.Forecast days 3 through 7......
.SATURDAY...Breezy. Mostly clear. Lows 44 to 50. Highs 75 to 82.
Southwest wind 15 to 25 mph gusts to 30 mph.
.SUNDAY...Cooler, windy. Partly cloudy. Slight chance of showers.
Lows 45 to 50. Highs 60 to 67. Southwest wind 20 to 30 mph with
gusts to 45 mph.
.MONDAY...Breezy, clear. Lows 33 to 38. Highs 59 to 66. Southwest
winds 15 to 25 mph gusts to 30 mph.
.TUESDAY...Clear. Lows in the upper 30s. Highs around 70.
.WEDNESDAY...Mostly clear. Lows in the lower 40s. Highs in the
lower 70s.
$$
IDZ411-102315-
Centennial Mountains and Snake River Range/Targhee NF-
254 AM MDT Thu Sep 10 2026
.Today...
* Sky/weather........Sunny then becoming partly cloudy.
* Chc of thunder.....Zero.
* Max Temperature....72-77 valleys. 65-72 ridges.
24 hr trend......2 degrees up.
* Min Humidity.......14-19 percent valleys. 15-23 percent ridges.
24 hr trend......2 percent down.
* 20ft wind..........
Valleys/lwr slopes...Southwest 6 to 11 mph.
Ridges/upr slopes....Southwest 6 to 11 mph. Gusts up to 15 mph
increasing to 25 mph in the afternoon.
* Chc Wetting Rain...Zero.
* Mixing Height......11000-12000 ft AGL.
* Transport Wind.....South 10 mph increasing to southwest
20 mph in the afternoon.
.TONIGHT...
* Sky/weather........Partly cloudy then becoming mostly cloudy.
Slight chance of rain showers after midnight.
* Chc of thunder.....Zero.
* Min Temperature....43-50.
24 hr trend......6 degrees up.
* Max Humidity.......83-91 percent valleys. 71-79 percent ridges.
24 hr trend......19 percent up.
* 20ft wind..........
Valleys/lwr slopes...South 2 to 8 mph shifting to the southeast
2 to 7 mph after midnight.
Ridges/upr slopes....Southwest 5 to 10 mph gusts to 20 mph.
* Chc Wetting Rain...10 percent.
* Mixing Height......1250-2250 ft AGL.
* Transport Wind.....Southwest 10 to 15 mph.
.FRIDAY...
* Sky/weather........Partly cloudy. Slight chance of rain showers
in the morning.
* Chc of thunder.....Zero.
* Max Temperature....Around 74 valleys. 63-70 ridges.
24 hr trend......Little change.
* Min Humidity.......16-21 percent valleys. 17-25 percent ridges.
24 hr trend......Little change.
* 20ft wind..........
Valleys/lwr slopes...Southwest 9 to 14 mph.
Ridges/upr slopes....Southwest 9 to 14 mph gusts to 30 mph.
* Chc Wetting Rain...10 percent.
* Mixing Height......14500-16000 ft AGL.
* Transport Wind.....Southwest 15 mph increasing to west
30 mph in the afternoon.
.Forecast days 3 through 7......
.SATURDAY...Mostly clear. Lows 40 to 47. Highs 66 to 73. South
winds 10 to 20 mph gusts to 30 mph.
.SUNDAY...Cooler, breezy. Partly cloudy. Chance of showers and
snow. Lows 40 to 47. Highs 51 to 58. South wind 15 to 25 mph
with gusts to 40 mph.
.MONDAY...Mostly clear. Lows 29 to 36. Highs 51 to 58. Southwest
winds 10 to 15 mph gusts to 30 mph.
.TUESDAY...Mostly clear. Lows in the mid 30s. Highs in the lower
60s.
.WEDNESDAY...Partly cloudy. Lows in the upper 30s. Highs in the
lower 60s.
$$
IDZ413-102315-
Caribou Range/Caribou NF-
254 AM MDT Thu Sep 10 2026
.Today...
* Sky/weather........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.......13-21 percent.
24 hr trend......Little change.
* 20ft wind..........
Valleys/lwr slopes...Southwest 6 to 11 mph.
Ridges/upr slopes....Southwest 3 to 9 mph gusts to
15 mph shifting to the west 7 to 12 mph
gusts to 20 mph in the
afternoon.
* Chc Wetting Rain...Zero.
* Mixing Height......11500-12500 ft AGL.
* Transport Wind.....South 10 mph increasing to west
20 mph in the afternoon.
.TONIGHT...
* Sky/weather........Mostly cloudy. Slight chance of rain showers
after midnight.
* Chc of thunder.....Zero.
* Min Temperature....49-56.
24 hr trend......9 degrees up.
* Max Humidity.......62-70 percent valleys. 58-66 percent ridges.
24 hr trend......11 percent up.
* 20ft wind..........
Valleys/lwr slopes...South 5 to 10 mph.
Ridges/upr slopes....South 5 to 10 mph gusts to 20 mph.
* Chc Wetting Rain...10 percent.
* Mixing Height......1250-2250 ft AGL.
* Transport Wind.....Southwest 10 to 15 mph.
.FRIDAY...
* Sky/weather........Mostly cloudy then becoming partly cloudy.
Slight chance of rain showers.
* Chc of thunder.....Zero.
* Max Temperature....74-81 valleys. 66-73 ridges.
24 hr trend......2 degrees down.
* Min Humidity.......22-30 percent.
24 hr trend......9 percent up.
* 20ft wind..........
Valleys/lwr slopes...Southwest 8 to 13 mph.
Ridges/upr slopes....Southwest 9 to 14 mph gusts to 25 mph.
* Chc Wetting Rain...10 percent.
* Mixing Height......14750-16250 ft AGL.
* Transport Wind.....Southwest 15 mph increasing to west
25 mph in the afternoon.
.Forecast days 3 through 7......
.SATURDAY...Mostly clear. Lows 46 to 53. Highs 75 to 82. South
winds 10 to 20 mph gusts to 35 mph.
.SUNDAY...Cooler, breezy. Partly cloudy. Slight chance of
showers. Lows 45 to 52. Highs 58 to 65. Southwest wind 15 to
25 mph gusts to 35 mph.
.MONDAY...Clear. Lows 32 to 39. Highs 60 to 67. West wind 10 to
20 mph gusts to 30 mph.
.TUESDAY...Mostly clear. Lows in the upper 30s. Highs around 70.
.WEDNESDAY...Partly cloudy. Lows in the mid 40s. Highs in the
lower 70s.
$$
.OUTLOOK from Thursday September 17 through Wednesday September 23:
Moderate confidence of above normal temperatures.
Weak confidence of above normal precipitation.
Messick
$$