338
FNUS75 KPIH 122238
FWSPIH
SPOT FORECAST FOR BIG ROCK FIRE...BLM-IFD
NATIONAL WEATHER SERVICE POCATELLO ID
438 PM MDT WED AUG 12 2026
FORECAST IS BASED ON FORECAST START TIME OF 1800 MDT ON AUGUST 12.
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 FOR THUNDERSTORMS IN EFFECT FROM NOON TO 9 PM MDT
THURSDAY...
DISCUSSION
MOIST AND UNSTABLE AIR HAS MOVED IN, PUSHING HUMIDITY
READINGS UP STRONGLY OVER THE NEXT FEW DAYS, BUT THE TRADE-OFF IS
SCATTERED THUNDERSTORMS THAT MAY TAX INITIAL ATTACK RESOURCES DURING
THIS PERIOD. DON'T EXPECT A CHANGE IN THE UNSETTLED WEATHER PATTERN
UNTIL SUNDAY OR MONDAY. A DIRECT HIT FROM A THUNDERSTORM MAY RESULT
IN THE EXTREME RAINFALL FORECAST BEING MORE ACCURATE THAN THE MOST
LIKELY RAINFALL FORECAST.
THURSDAY
SKY/WEATHER.........MOSTLY CLOUDY, BY 1300 BECOMING CLOUDY. A 20 PERCENT
CHANCE OF RAIN PRIOR TO 1200, THEN A 60 PERCENT
CHANCE AFTER. A SLIGHT CHANCE OF THUNDERSTORMS PRIOR
TO 1200, THEN A CHANCE AFTER. GUSTS TO 35 MPH NEAR
THUNDERSTORMS.
CWR.................BEFORE 1200: 10 PERCENT. AFTER 1200: 42 PERCENT.
CHANCE OF THUNDER...BEFORE 1200: 13 PERCENT. AFTER 1200: 39 PERCENT.
MAX TEMPERATURE.....5100FT ELEVATION...75.
MIN HUMIDITY........5100FT ELEVATION...51 PERCENT.
WIND (20 FT)........SOUTHEAST 4 TO 10 MPH GUSTS TO 14 MPH, BY 1000 BECOMING
WEST 8 TO 14 MPH GUSTS TO 24 MPH.
MIXING HEIGHT.......MORNING INVERSION TOP 300FT TO 1400FT AGL.
MIXING HEIGHT RISING TO 800FT TO 1900FT AGL.
TRANSPORT WINDS.....SOUTH SOUTHEAST 10 MPH, AFTER INVERSION BREAK NORTHWEST
8 MPH.
RAINFALL AMOUNT.....EXTREME RANGE: NONE TO 0.58 OF AN INCH.
MOST LIKELY RANGE: TRACE TO 0.23 OF AN INCH.
THURSDAY NIGHT
SKY/WEATHER.........PARTLY CLOUDY. A 30 PERCENT CHANCE OF SHOWERS PRIOR
TO MIDNIGHT, AND A 55 PERCENT CHANCE AFTER. A CHANCE
OF THUNDERSTORMS PRIOR TO MIDNIGHT, AND A SLIGHT CHANCE
AFTER. GUSTS TO 40 MPH NEAR THUNDERSTORMS.
CWR.................PRIOR TO MIDNIGHT: 10 PERCENT. AFTER MIDNIGHT: 42 PERCENT.
CHANCE OF THUNDER...PRIOR TO MIDNIGHT: 25 PERCENT. AFTER MIDNIGHT: 11 PERCENT.
MIN TEMPERATURE.....5100FT ELEVATION...52.
MAX HUMIDITY........5100FT ELEVATION...IN EXCESS OF 90 PERCENT.
WIND (20 FT)........VARIABLE UP TO 5 MPH, BY 0100 BECOMING SOUTHEAST 2 TO 7 MPH
GUSTS TO 10 MPH.
MIXING HEIGHT.......NO INVERSION. MIXING HEIGHT LOWERING TO 100FT TO 1200FT AGL.
TRANSPORT WINDS.....SOUTHEAST 5 MPH.
RAINFALL AMOUNT.....EXTREME RANGE: NONE TO 0.40 OF AN INCH.
MOST LIKELY RANGE: TRACE TO 0.18 OF AN INCH.
FRIDAY
SKY/WEATHER.........PARTLY SUNNY, BY 1000 BECOMING MOSTLY CLOUDY. A 55 PERCENT
CHANCE OF SHOWERS PRIOR TO 1200, AND A 70 PERCENT CHANCE
AFTER. A SLIGHT CHANCE OF THUNDERSTORMS PRIOR TO 1200, AND
A CHANCE AFTER. GUSTS TO 50 MPH NEAR THUNDERSTORMS.
CWR.................PRIOR TO 1200: 36 PERCENT. AFTER 1200: 50 PERCENT.
CHANCE OF THUNDER...PRIOT TO 1200: 16 PERCENT. AFTER 1200: 45 PERCENT.
MAX TEMPERATURE.....5100FT ELEVATION...72.
MIN HUMIDITY........5100FT ELEVATION...53 PERCENT.
WIND (20 FT)........SOUTHEAST 3 TO 9 MPH GUSTS TO 12 MPH, BY 1000 BECOMING
SOUTHWEST 8 TO 14 MPH GUSTS TO 24 MPH.
MIXING HEIGHT.......RISING TO 7900FT TO 9000FT AGL.
TRANSPORT WINDS.....SOUTH SOUTHWEST 25 MPH.
RAINFALL AMOUNT.....EXTREME RANGE: NONE TO 0.71 OF AN INCH.
MOST LIKELY RANGE: 0.04 TO 0.39 OF AN INCH.
FORECASTER...MESSICK
REQUESTED BY...DISPATCH
TYPE OF REQUEST...WILDFIRE
.TAG 2618766.13/PIH
.DELDT 08/12/26
.FORMATTERVERSION 2.0.0
.EMAIL SMAUPIN@BLM.GOV,IDEIC@FIRENET.GOV,JMITCHELL@BLM.GOV,ROBERT.RICKS@MFD.ID.GOV
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