156
FNUS76 KOTX 091927
FWSOTX
SPOT FORECAST FOR UPPER SMITH...USFS
NATIONAL WEATHER SERVICE SPOKANE WA
1227 PM PDT SUN AUG 9 2026
FORECAST IS BASED ON FORECAST START TIME OF 0600 PDT ON AUGUST 10.
DISCUSSION
WARM AND DRY CONDITIONS WILL CONTINUE THROUGH TUESDAY. FAIR RH
RECOVERIES ARE EXPECTED OVERNIGHT. WINDS DURING THE DAY WILL BE
SOUTHWESTERLY BETWEEN 5 TO 10 MPH, WITH SOME GUSTINESS IN THE
AFTERNOON, THEN TURNING LIGHTER OVERNIGHT. SMOKE AND HAZE FROM
REGIONAL FIRES WILL HELP KEEP CONDITIONS MILD. BY WEDNESDAY
AFTERNOON A 60% CHANCE FOR SHOWERS AND 25% CHANCE OF THUNDERSTORMS
ARRIVES, BUT WITH ONLY ABOUT AT 5-10% CHANCE OF WETTING RAINS. IT
WILL COME WITH SLIGHTLY COOLER TEMPERATURES, HIGHER HUMIDITY VALUES
AND SOME AFTERNOON BREEZINESS.
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).
***************************************************************
MONDAY
SKY/WEATHER.........SUNNY. HAZE AND SMOKE.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MAX TEMPERATURE.....70-77.
MIN HUMIDITY........30-37 PERCENT.
WIND (20 FT)........NORTHEAST WINDS 2 TO 5 MPH IN THE MORNING...BECOMING
SOUTHWEST 5 TO 10 MPH WITH GUSTS TO 18 MPH IN THE
AFTERNOON.
MIXING HEIGHT.......4500 FT AGL INCREASING TO 8000 FT AGL IN THE
AFTERNOON.
TRANSPORT WINDS.....SOUTHWEST 7 TO 13 MPH.
VENTILATION INDEX...MODERATE (374) INCREASING TO VERY HIGH (978) IN
THE AFTERNOON.
MONDAY NIGHT
SKY/WEATHER.........PARTLY CLOUDY. HAZE AND SMOKE.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MIN TEMPERATURE.....52-57.
MAX HUMIDITY........55 PERCENT.
WIND (20 FT)........SOUTHWEST WINDS 5 TO 10 MPH IN THE EVENING
WITH GUSTS TO 15 MPH BEFORE 2100...BECOMING
NORTH-NORTHEAST 2 TO 4 MPH.
MIXING HEIGHT.......6000 FT AGL FALLING TO 500 FT AGL.
TRANSPORT WINDS.....SOUTHWEST 6 TO 10 MPH.
VENTILATION INDEX...HIGH (728) DECREASING TO LOW (34) OVERNIGHT.
TUESDAY
SKY/WEATHER.........MOSTLY SUNNY. HAZE AND SMOKE.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MAX TEMPERATURE.....70-76.
MIN HUMIDITY........33-41 PERCENT.
WIND (20 FT)........LIGHT WINDS BECOMING SOUTH AROUND 5 TO 10 MPH
IN THE AFTERNOON.
MIXING HEIGHT.......5500 FT AGL INCREASING TO 9000 FT AGL IN THE
AFTERNOON.
TRANSPORT WINDS.....SOUTHWEST 6 TO 12 MPH.
VENTILATION INDEX...MODERATE (373) INCREASING TO VERY HIGH (982) IN
THE AFTERNOON.
FORECASTER...MSC
REQUESTED BY...DAVID PEARSON
TYPE OF REQUEST...WILDFIRE
.TAG 2619090.4/OTX
.DELDT 08/09/26
.FORMATTERVERSION 2.0.0
.EMAIL IDCDC@FIRENET.GOV,DAVID_PEARSON@FIRENET.GOV,2026.UPPERSMITH.PLANS@FIRENET.GOV
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