206
FNUS76 KOTX 161630
FWSOTX
SPOT FORECAST FOR SISI...CWICC
NATIONAL WEATHER SERVICE SPOKANE WA
930 AM PDT SUN AUG 16 2026
FORECAST IS BASED ON FORECAST START TIME OF 1215 PDT ON AUGUST 16.
DISCUSSION
DISCUSSION:
EXPECT A SUBTLE WARMING AND DRYING TREND THE NEXT SEVERAL DAYS.
THERE REMAINS A 20% CHANCE FOR AFTERNOON SHOWERS AND THUNDERSTORMS
TODAY (1500-2100) WHICH DECREASES TO 10% ON MONDAY. ANY THUNDERSTORMS
THAT DO DEVELOP AFTERNOON WILL BE CAPABLE OF PRODUCING BRIEF HEAVY
DOWNPOURS AND GUSTY, ERRATIC WINDS. OTHERWISE, WINDS WILL GENERALLY
BE LIGHT AND TERRAIN DRIVEN AWAY FROM THUNDERSTORM OUTFLOWS. POOR
SMOKE DISPERSION IS EXPECTED WITHIN THE LOWER DRAINAGES. OUTSIDE
THUNDERSTORM INDUCED WINDS, WINDS WILL BE TERRAIN DRIVEN.
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.........PARTLY SUNNY. HAZE AND AREAS OF SMOKE. 20%
CHANCE OF SHOWERS AND THUNDERSTORMS.
CWR.................15 PERCENT.
CHANCE OF LIGHTNING.20 PERCENT.
MAX TEMPERATURE.....69.
MIN HUMIDITY........49-54 PERCENT.
WIND (20 FT)........UPSLOPE OR WEST WINDS 3 TO 7 MPH. INFREQUENT WIND SPEEDS
TO 11 MPH MID TO UPPER SLOPES. GUSTY AND ERRATIC WINDS
EXPECTED NEAR THUNDERSTORMS.
MIXING HEIGHT.......4500 FT AGL.
TRANSPORT WINDS.....SOUTHWEST AROUND 6 MPH.
VENTILATION INDEX...MODERATE (263).
TONIGHT
SKY/WEATHER.........PARTLY CLOUDY WITH A 10% CHANCE FOR SHOWERS AND
THUNDERSTORMS IN THE EVENING BECOMING MOSTLY CLOUDY.
HAZE AND SMOKE.
CWR.................10 PERCENT BEFORE 2100.
CHANCE OF LIGHTNING.10 PERCENT BEFORE 2100.
MIN TEMPERATURE.....AROUND 54.
MAX HUMIDITY........65-70 PERCENT.
WIND (20 FT)........WEST WINDS AROUND 6 MPH IN THE EVENING BECOMING
DOWNSLOPE OR EAST 1 TO 4 MPH.
MIXING HEIGHT.......3000 FT AGL FALLING TO 500 FT AGL.
TRANSPORT WINDS.....WEST 6 MPH DECREASING TO 2 MPH.
VENTILATION INDEX...LOW (179).
MONDAY
SKY/WEATHER.........MOSTLY CLOUDY THEN BECOMING MOSTLY SUNNY.
PATCHY SMOKE.
CWR.................5 PERCENT.
CHANCE OF LIGHTNING.10 PERCENT.
MAX TEMPERATURE.....72.
MIN HUMIDITY........38-43 PERCENT.
WIND (20 FT)........UPSLOPE 3 TO 8 MPH.
MIXING HEIGHT.......6500 FT AGL IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTHEAST AROUND 4 MPH SHIFTING TO THE
WEST AROUND 8 MPH AFTER 1600.
VENTILATION INDEX...MODERATE (222) INCREASING TO HIGH (771) IN THE
AFTERNOON.
FORECASTER...SB
REQUESTED BY...JASON RUSSELL
TYPE OF REQUEST...WILDFIRE
.TAG 2619765.1/OTX
.DELDT 08/16/26
.FORMATTERVERSION 2.0.0
.EMAIL WACWC@FIRENET.GOV
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