771
FNUS76 KOTX 251202
FWSOTX
SPOT FORECAST FOR PTARMIGAN...USFS
NATIONAL WEATHER SERVICE SPOKANE WA
502 AM PDT TUE AUG 25 2026
FORECAST IS BASED ON FORECAST START TIME OF 0600 PDT ON AUGUST 25.
DISCUSSION
TUESDAY WILL BE WARM AND DRY WITH WEAK WINDS UNDER A RIDGE OF HIGH
PRESSURE. FAIR RELATIVE HUMIDITY RECOVERY OVERNIGHT TUESDAY. THEN
THE RIDGE BECOMES DISPLACED TO THE EAST ON WEDNESDAY. THIS WILL
BRING INCREASED SOUTHWEST WINDS WITH GUSTS UP TO 20 MPH ALONG WITH
A SMALL CHANCE FOR A THUNDERSTORM.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER
SERVICE.
***************************************************************
FORECASTS FOR 20 FOOT WIND SPEEDS (VALLEYS AND RIDGE TOPS) ARE
10 MINUTE AVERAGES REFLECTING RAWS WIND.
***VENTILATION INDEX IS DERIVED FROM TRANSPORT WIND
MULTIPLIED BY THE MIXING HEIGHT DIVIDED BY 100.
CATEGORIES: LOW (< 200), MODERATE (200-500),
HIGH (500-800), AND VERY HIGH (> 800).
***************************************************************
TODAY
SKY/WEATHER.........SUNNY.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MAX TEMPERATURE.....70-80.
MIN HUMIDITY........19-25 PERCENT.
WIND (20 FT)........DOWNSLOPE/DOWNVALLEY 1 TO 4 MPH THROUGH
1000 THEN UPSLOPE/UPVALLEY 3 TO 7 MPH.
MIXING HEIGHT.......NEAR SURFACE THROUGH 0900 INCREASING TO
8000 FT AGL IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTH 5 TO 10 MPH.
VENTILATION INDEX...LOW (40) THROUGH 0900 INCREASING TO HIGH
(701) IN THE AFTERNOON.
TONIGHT
SKY/WEATHER.........MOSTLY CLEAR. HAZE AND AREAS OF SMOKE THROUGH
THE NIGHT.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.5 PERCENT.
MIN TEMPERATURE.....48-55.
MAX HUMIDITY........55-65 PERCENT.
WIND (20 FT)........SOUTH WINDS 3 TO 6 MPH.
MIXING HEIGHT.......FALLING TO NEAR SURFACE AT 1900 PDT.
TRANSPORT WINDS.....SOUTH 5 TO 8 MPH.
VENTILATION INDEX...HIGH (593) DECREASING TO LOW (20) AT 1900.
WEDNESDAY
SKY/WEATHER.........MOSTLY SUNNY. A 10 PERCENT CHANCE OF SHOWERS OR
THUNDERSTORMS IN THE AFTERNOON.
CWR.................2 PERCENT.
CHANCE OF LIGHTNING.10 PERCENT.
MAX TEMPERATURE.....68-77.
MIN HUMIDITY........26-34 PERCENT.
WIND (20 FT)........LIGHT WINDS BECOMING SOUTHWEST 6 TO 10 MPH WITH
GUSTS UP TO 20 MPH IN THE AFTERNOON.
MIXING HEIGHT.......NEAR SURFACE THROUGH 0900 INCREASING TO 9000 FT
AGL IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTH 5 TO 10 MPH IN THE MORNING THEN INCREASING
TO 10 TO 20 MPH.
VENTILATION INDEX...LOW (50) THROUGH 0900 INCREASING TO VERY HIGH
(1174) IN THE AFTERNOON.
FORECASTER...JW
REQUESTED BY...BRIAN CAMPBELL
TYPE OF REQUEST...WILDFIRE
.TAG 2620029.5/OTX
.DELDT 08/25/26
.FORMATTERVERSION 2.0.0
.EMAIL MICHAEL.BARAJAS@USDA.GOV,WILLIAM.BURKS4@USDA.GOV,BRIAN.D.CAMPBELL@USDA.GOV
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