450
FNUS76 KOTX 131200
FWSOTX
SPOT FORECAST FOR PRICHARD-MURRAY HAND PILES...USFS
NATIONAL WEATHER SERVICE SPOKANE WA
500 AM PDT TUE OCT 13 2026
FORECAST IS BASED ON IGNITION TIME OF 0900 PDT ON OCTOBER 13.
DISCUSSION
CONDITIONS WILL BE SEASONAL THE NEXT COUPLE DAYS AS HIGH PRESSURE
BUILDS. A WEAK EMBEDDED WAVE WILL BRING INCREASED WESTERLY
TRANSPORT WINDS WEDNESDAY BRINGING IMPROVEMENTS TO VENTILATION.
INVERSIONS WILL DEVELOP QUICKLY AROUND SUNSET EACH AND BE STRONG,
TRAPPING IN SMOKE IN THE DRAINAGES. TEMPERATURES CONTINUE TO
INCREASE THROUGH LATE THIS WEEK AS HIGH PRESSURE PEAKS IN
STRENGTH. THE RIDGE WILL BREAK DOWN SATURDAY, BRINGING GUSTY
SOUTHWEST WINDS AROUND 8-14 MPH WITH GUSTS AROUND 18-25 MPH AND
COOLER TEMPERATURES. THE NEXT CHANCE FOR RAINS WILL BE NEXT MONDAY
AS A STRONG SYSTEM DIVES SOUTHWARD TOWARDS CALIFORNIA. TYPICALLY
THIS STORM TRACK DOES NOT FAVOR MUCH PRECIPITATION SO MODELS ONLY
HAVE A 40% CHANCE OF A TENTH INCH OR MORE IN THE AREA. THOSE
CHANCES DECREASE TO 17% FOR A QUARTER INCH OR MORE.
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.........PARTLY SUNNY WITH TRANSPARENT MID AND HIGH
CLOUDS. WIDESPREAD FROST IN THE MORNING.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MAX TEMPERATURE.....56-59.
MIN HUMIDITY........42-47 PERCENT.
WIND (20 FT)........NORTHWEST WINDS 1-4 MPH.
MIXING HEIGHT.......2500 FT AGL. INVERSION BREAKING AROUND 0900 HOURS.
TRANSPORT WINDS.....WEST AROUND 6 MPH.
VENTILATION INDEX...LOW (173).
TONIGHT
SKY/WEATHER.........MOSTLY CLEAR. WIDESPREAD FROST.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MIN TEMPERATURE.....29.
MAX HUMIDITY........NEAR 100 PERCENT.
WIND (20 FT)........LIGHT WINDS.
MIXING HEIGHT.......FALLING TO NEAR SURFACE AROUND 1830 HOURS.
TRANSPORT WINDS.....SOUTH AROUND 5 MPH.
VENTILATION INDEX...LOW (20).
WEDNESDAY
SKY/WEATHER.........MOSTLY SUNNY. WIDESPREAD FROST IN THE MORNING.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MAX TEMPERATURE.....58-62.
MIN HUMIDITY........43-48 PERCENT.
WIND (20 FT)........LIGHT WINDS BECOMING WEST 2-5 MPH AROUND
1200 HOURS.
MIXING HEIGHT.......3500 FT AGL. INVERSION BREAKING AROUND 1000 HOURS.
TRANSPORT WINDS.....SOUTHWEST AROUND 7 MPH SHIFTING TO THE WEST
AROUND 9 MPH IN THE AFTERNOON.
VENTILATION INDEX...MODERATE (350).
FORECASTER...DB
REQUESTED BY...PATRICK WARKER
TYPE OF REQUEST...PRESCRIBED
.TAG 2623651.0/OTX
.DELDT 10/13/26
.FORMATTERVERSION 2.0.0
.EMAIL KYLE.MANN@USDA.GOV,PATRICK.WARKER@USDA.GOV
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page