488
FNUS76 KOTX 251226
FWSOTX
SPOT FORECAST FOR WILLY...USFS
NATIONAL WEATHER SERVICE SPOKANE WA
526 AM PDT SAT JUL 25 2026
FORECAST IS BASED ON FORECAST START TIME OF 0800 PDT ON JULY 25.
...RED FLAG WARNING IN EFFECT FROM 11 AM THIS MORNING TO 10 PM
PDT THIS EVENING...
DISCUSSION
A DRY COLD FRONT MOVING THROUGH THE REGION WILL BRING LOW
HUMIDITIES AND INCREASING SOUTHWESTERLY WINDS AT THE FIRE
LOCATION THROUGH THIS AFTERNOON. WINDS WILL LIKELY BE 5-10 MPH
HIGHER ACROSS THE RIDGETOPS IMMEDIATELY SOUTH OF THE FIRE
LOCATION. WINDS WILL RELAX IN THE EVENING AND BECOME LIGHT
WEST TO NORTHWESTERLY OVERNIGHT. THERE IS A REMOTE (5%) CHANCE FOR
AN ISOLATED THUNDERSTORM NEAR THE NORTHERN BORDER WHICH COULD
IMPACT THE FIRE LOCATION. OTHERWISE, LIGHTER WINDS WILL THEN
PREVAIL THROUGH SUNDAY WITH SLIGHTLY HIGHER HUMIDITY VALUES.
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).
***************************************************************
REST OF TODAY
SKY/WEATHER.........MOSTLY SUNNY. HAZE AND AREAS OF SMOKE.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MAX TEMPERATURE.....AROUND 81-83.
MIN HUMIDITY........17-22 PERCENT.
WIND (20 FT)........SOUTH WINDS 2 TO 4 MPH THROUGH 0900 HOURS. WINDS
THEN SHIFT SOUTHWESTERLY AND STEADILY INCREASE TO
15 TO 18 MPH THROUGH 1600 HOURS. GUSTS UP TO 35
MPH POSSIBLE THIS AFTERNOON. WINDS THEN MAKE A
SUBTLE WESTWARD SHIFT BETWEEN 1600 AND 1900 HOURS
WHILE SUBSIDING TO 8 TO 12 MPH.
MIXING HEIGHT.......8500 FT AGL INCREASING TO 10500 FT AGL IN THE
AFTERNOON.
TRANSPORT WINDS.....SOUTH AROUND 13 MPH INCREASING TO AROUND 25 MPH IN
THE AFTERNOON.
VENTILATION INDEX...VERY HIGH (1623) INCREASING TO VERY HIGH (2344) IN
THE AFTERNOON.
TONIGHT
SKY/WEATHER.........MOSTLY CLEAR. HAZE AND AREAS OF SMOKE. A SLIGHT
CHANCE OF A THUNDERSTORM.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.5 PERCENT.
MIN TEMPERATURE.....AROUND 52-54.
MAX HUMIDITY........63-68 PERCENT.
WIND (20 FT)........WEST WINDS 7 TO 11 MPH WITH GUSTS TO 20MPH THROUGH
2200 HOURS, THEN QUICKLY BECOMING LIGHT 3 MPH OR LESS.
PREVAILING WIND DIRECTION WILL GRADUALLY BECOME
NORTHWESTERLY OVERNIGHT.
MIXING HEIGHT.......9000 FT AGL FALLING TO 500 FT AGL.
TRANSPORT WINDS.....WEST 10 TO 15 MPH IN THE EVENING, BECOMING 3 TO 6 MPH
OVERNIGHT.
VENTILATION INDEX...VERY HIGH (1755) DECREASING TO LOW (30) OVERNIGHT.
SUNDAY
SKY/WEATHER.........SUNNY. HAZE AND AREAS OF SMOKE.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MAX TEMPERATURE.....AROUND 76-78.
MIN HUMIDITY........18-23 PERCENT.
WIND (20 FT)........LIGHT VARIABLE WINDS BECOMING SOUTH 7 TO 12 MPH IN THE
AFTERNOON.
MIXING HEIGHT.......5500 FT AGL INCREASING TO 9000 FT AGL IN THE
AFTERNOON.
TRANSPORT WINDS.....SOUTH 7 TO 14 MPH.
VENTILATION INDEX...HIGH (502) INCREASING TO VERY HIGH (1143) IN
THE AFTERNOON.
FORECASTER...PP
REQUESTED BY...JASON HEADLEY
TYPE OF REQUEST...WILDFIRE
.TAG 2618166.0/OTX
.DELDT 07/25/26
.FORMATTERVERSION 2.0.0
.EMAIL JASON.HEADLEY@USDA.GOV
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