102
FNUS75 KPIH 211037
FWSPIH

Spot Forecast for North Heglar...FS-STF
National Weather Service Pocatello ID
437 AM MDT Fri Aug 21 2026

Forecast is based on forecast start time of 0600 MDT on August 21.
If conditions become unrepresentative, contact the National Weather
Service.

Please contact our office at (208) 232-9357, if you have questions
or concerns with this forecast.

...HEAT ADVISORY IN EFFECT FROM NOON TODAY TO 10 PM MDT THIS
EVENING...

.DISCUSSION...Very hot temperatures continue this afternoon, but
moisture moving in from the south with some unstable air will bring
a return to showers and thunderstorms. There is a slight chance of
dry thunderstorms this afternoon and evening, then an increase in
the threat for Saturday afternoon and evening. Wind will stay light
but very unstable air will allow for strong fire intensity and rapid
fire growth. If the incident sustains a direct hit from a thunderstorm,
expected the high end of the extreme amounts of rainfall.

.TODAY...

Sky/weather.........Mostly sunny, by 1200 becoming partly sunny. A
                     slight chance of dry thunderstorms after 1200.
                     Gusts to 30 mph near thunderstorms.
CWR.................Zero.
Chance of thunder...After 1200: 18 percent.
Max temperature.....5100ft elevation...97.
Min humidity........5100ft elevation...15 percent.
Wind (20 ft)........Southeast 2 to 8 mph gusts to 12 mph, by 1000 becoming
                     southwest 2 to 8 mph gusts to 14 mph. By 1300, wind
                     becoming northwest 2 to 8 mph gusts to 14 mph.
Mixing height.......Morning inversion around 5800ft elevation/700ft AGL
                    Mixing height rising to around 14,500ft AGL.
Transport winds.....East southeast 7 mph, after inversion break south
                     southwest 8 mph.
Rainfall amount.....None to trace.

.TONIGHT...

Sky/weather.........Partly cloudy, by midnight becoming mostly
                     cloudy. A 10 percent chance of showers before
                     midnight, and a 30 percent chance after. A
                     slight chance of thunderstorms through the
                     night. Gusts to 30 mph near thunderstorms.
CWR.................Before midnight: near zero. After midnight: 10 percent.
Chance of thunder...Before midnight: 15 percent. After midnight: 9 percent.
Min temperature.....5100ft elevation...70.
Max humidity........5100ft elevation...60 percent.
Wind (20 ft)........North 2 to 6 mph, by 1900 becoming south 6 to 12 mph gusts
                     to 20 mph. By 0400, wind becoming southeast 8 to 14 mph
                     gusts to 22 mph.
Mixing height.......Inversion developing around 5900ft elevation/800ft AGL.
Transport winds.....East southeast 8 mph.
Rainfall amount.....Extreme range: None to 0.10 of an inch.
                    Most likely range: None to 0.05.

.SATURDAY...

Sky/weather.........Mostly cloudy, by 0900 becoming partly sunny. After
                     1600 skies becoming mostly cloudy again. A 10 percent
                     chance of showers prior to 1200, and a 50 percent
                     chance after. A chance of thunderstorms after 1200.
                     Gusts to 40 mph near thunderstorms.
CWR.................Before 1200: Near zero. After 1200: 17 percent.
Chance of thunder...Before 1200: 7 percent. After 1200: 39 percent.
Max temperature.....5100ft elevation...90.
Min humidity........5100ft elevation...25 percent.
Wind (20 ft)........South 6 to 12 mph gusts to 18 mph, by 0900 becoming
                     south 2 to 6 mph gusts to 10 mph. By 1000 becoming
                     southwest 3 to 9 mph gusts to 16 mph. By 1300
                     becoming southwest 7 to 13 mph gusts to 24 mph.
Mixing height.......Rising to 12,500ft AGL.
Transport winds.....Southwest 14 mph.
Rainfall amount.....Extreme range: None to 0.21 of an inch.
                    Most likely range: Trace to 0.08.

$$
Forecaster...Messick
Requested by...Brandon Hankla
Type of request...WILDFIRE
.TAG 2620150.0/PIH
.DELDT 08/21/26
.FormatterVersion 2.0.0
.EMAIL idscc@firenet.gov,stewart.schiffler@usda.gov,brandon.hankla@usda.gov