326
FNUS76 KOTX 142000
FWSOTX
SPOT FORECAST FOR UPPER SMITH...USFS
NATIONAL WEATHER SERVICE SPOKANE WA
100 PM PDT FRI AUG 14 2026
FORECAST IS BASED ON FORECAST START TIME OF 1300 PDT ON AUGUST 15.
DISCUSSION
209:
THE UPPER SMITH FIRE HAS BEEN UNDER CLOUDY CONDITIONS FOR MUCH OF
FRIDAY KEEPING TEMPERATURES ON THE COOL SIDE. AREA HAS NOT SEEN
ANY SHOWERS ACTIVITY. WINDS REMAINED LIGHT AND PRIMARILY TERRAIN
DRIVEN. HIGHS CLIMBED INTO THE 60S TO LOW 70S WITH RELATIVE
HUMIDITY IN THE 50-60% RANGE.
SATURDAY CONTINUES THE WARM UP TREND WITH TEMPERATURES CLIMBING
INTO THE 60S TO LOWER 70S. SCATTERED CUMULUS BUILDUPS IN THE
AFTERNOON HAVE LESS THAN 10% CHANCE OF MATURING INTO SHOWERS OR
WEAK THUNDERSTORMS. INCREASING HIGH PRESSURE WILL PROMOTE WARMING
AND DRYING THROUGH THE WEEKEND THOUGH RESIDUAL MOISTURE WILL LEAD
TO GOOD RECOVERIES AT NIGHT AND AFTERNOON HUMIDITY LEVELS ABOVE
30%.
DISCUSSION:
EXPECT GRADUALLY WARMING CONDITIONS OVER THE NEXT FEW DAYS WITH
RECURRING CHANCES FOR SHOWERS AND THUNDERSTORMS EACH DAY, PEAKING
DURING THE AFTERNOON AND EVENING HOURS. LIGHTNING CHANCES WILL
CONTINUE TO WEAKEN EACH DAY. THUNDERSTORMS WILL BE CAPABLE OF
PRODUCING BRIEF HEAVY DOWNPOURS AND GUSTY, ERRATIC WINDS. WINDS
WILL GENERALLY BE LIGHT AWAY FROM THUNDERSTORMS. PRECIP AMOUNTS
ARE EXPECTED TO BE A FEW HUNDREDTHS AT MOST.
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).
***************************************************************
SATURDAY
SKY/WEATHER.........PARTLY CLOUDY.
CWR.................5 PERCENT.
CHANCE OF LIGHTNING.5 PERCENT.
MAX TEMPERATURE.....68 RIDGETOP TO 80 VALLEY BOTTOM.
MIN HUMIDITY........40-48 PERCENT.
WIND (20 FT)........UPSLOPE/UPVALLEY 3 TO 6 MPH.
MIXING HEIGHT.......1000 FT AGL AT 0700. BECOMING 6500 FT AGL IN THE
AFTERNOON.
TRANSPORT WINDS.....LIGHT WINDS BECOMING SOUTHWEST AROUND 7 MPH IN
THE AFTERNOON.
VENTILATION INDEX...LOW (140) INCREASING TO MODERATE (442) IN THE
AFTERNOON.
SATURDAY NIGHT
SKY/WEATHER.........PARTLY CLOUDY THEN BECOMING MOSTLY CLOUDY.
PATCHY SMOKE IN THE EVENING.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.5 PERCENT.
MIN TEMPERATURE.....AROUND 53.
MAX HUMIDITY........65 PERCENT. GOOD RECOVERY
WIND (20 FT)........LIGHT WINDS.
MIXING HEIGHT.......4000 FT AGL FALLING TO NEAR SURFACE AROUND 2000.
TRANSPORT WINDS.....NORTHWEST 5 TO 6 MPH.
VENTILATION INDEX...LOW (152).
SUNDAY
SKY/WEATHER.........MOSTLY SUNNY.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.5 PERCENT.
MAX TEMPERATURE.....74 RIDGETOP TO 82 VALLEY BOTTOM.
MIN HUMIDITY........38-45 PERCENT.
WIND (20 FT)........SOUTHWEST DOWNSLOPE/DOWN VALLEY AT 4 TO 8 MPH.
MIXING HEIGHT.......1000 FT AGL AT 0800 INCREASING TO 7500 FT AGL IN
THE AFTERNOON.
TRANSPORT WINDS.....LIGHT WINDS BECOMING SOUTHWEST AROUND 10 MPH IN
THE AFTERNOON.
VENTILATION INDEX...MODERATE (220) INCREASING TO HIGH (763) IN THE
AFTERNOON.
FORECASTER...JCLEV
REQUESTED BY...DAVID PEARSON
TYPE OF REQUEST...WILDFIRE
.TAG 2619090.9/OTX
.DELDT 08/14/26
.FORMATTERVERSION 2.0.0
.EMAIL DAVID_PEARSON@FIRENET.GOV,2026.UPPERSMITH.PLANS@FIRENET.GOV,IDCDC@FIRENET.GOV
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