856
FNUS75 KPIH 140025
FWSPIH

Spot Forecast for Big Rock Fire...BLM-IFD
National Weather Service Pocatello ID
625 PM MDT Thu Aug 13 2026

Forecast is based on forecast start time of 1800 MDT on August 13.
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.

...RED FLAG WARNING IN EFFECT UNTIL 9 PM MDT THIS EVENING...

.DISCUSSION...Remnants of the southwest monsoon reached central
Idaho on Thursday. This surge will continue both Friday and Saturday,
bringing threat of very heavy rainfall and lightning in the very
moist and unstable air.

.TONIGHT...

Sky/weather.........Cloudy with areas of fog. A 65 percent chance of
                     showers prior to midnight, then a 45 percent
                     chance after. A chance of thunderstorms prior
                     to midnight, and a slight chance after. Gusts
                     to 40 mph near thunderstorms.
CWR.................Before midnight: 24 percent. After midnight: 44 percent.
Chance of thunder...Before midnight: 25 percent. After midnight: 17 percent.
Min temperature.....5100ft elevation...52.
Max humidity........5100ft elevation...More than 90 percent.
Wind (20 ft)........East 2 to 6 mph shifting, becoming southeast 2 to 6 mph.
Rainfall............Extreme range: None to 0.60 of an inch.
                    Most likely range: Trace to 0.15 of an inch.

.FRIDAY...

Sky/weather.........Cloudy with areas of fog until 0900, then becoming
                     mostly cloudy. A 45 percent chance of showers prior to
                     1200, and a 60 percent chance after. A slight chance of
                     thunderstorms prior to 1200, and a 48 percent chance
                     after. Gusts to 50 mph near thunderstorms.
CWR.................Before 1200: 24 percent. After 1200: 44 percent.
Chance of thunder...Before 1200: 19 percent. After 1200: 48 percent.
Max temperature.....5100ft elevation...72.
Min humidity........5100ft elevation...53 percent.
Wind (20 ft)........Southeast 3 to 8 mph  gusts to 14 mph, shifting to the
                    south 2 to 7 mph in the afternoon.
Rainfall............Extreme range: None to 0.55 of an inch.
                    Most likely range: Trace to 0.28 of an inch.

.FRIDAY NIGHT...

Sky/weather.........Mostly cloudy, by 1900 becoming partly cloudy. By
                     midnight becoming mostly clear. A 55 percent chance of
                     showers prior to midnight, and a 20 percent chance
                     after. A chance of thunderstorms prior to midnight, and
                     a near zero chance after. Gusts to 50 mph near thunder-
                     storms.
CWR.................Before midnight: 28 percent. After midnight: 9 percent.
Chance of thunder...Before midnight: 28 percent. After midnight: 7 percent.
Min temperature.....5100ft elevation...51.
Max humidity........5100ft elevation...More than 90 percent.
Wind (20 ft)........Southeast 2 to 7 mph.
Rainfall............Extreme range: None to 0.40 of an inch.
                    Most likely range: Trace to 0.21 of an inch.

.SATURDAY...

Sky/weather.........Mostly sunny, by 0900 becoming partly sunny. A 25 percent
                     chance of showers prior to 1200, and a 50 percent chance
                     after. A slight chance of thunderstorms prior to 1200, and
                     a chance of thunderstorms after.
CWR.................Before 1200: 11 percent. After 1200: 21 percent.
Chance of thunder...Before 1200: 11 percent. After 1200: 39 percent.
Max temperature.....5100ft elevation...75.
Min humidity........5100ft elevation...45 percent.
Wind (20 ft)........Southeast 2 to 7 mph becoming southwest 2 to 6 mph in
                    the afternoon.
Rainfall............Extreme range: None to 0.45 of an inch.
                    Most likely range: Trace to 0.15 of an inch.

$$
Forecaster...Messick
Requested by...Andres Christiansen
Type of request...WILDFIRE
.TAG 2619647.0/PIH
.DELDT 08/13/26
.FormatterVersion 2.0.0
.EMAIL mfearn@blm.gov