089
FNUS76 KOTX 032019
FWSOTX
SPOT FORECAST FOR UPPER SMITH SOUTH...UPPER SMITH
NATIONAL WEATHER SERVICE SPOKANE WA
119 PM PDT THU SEP 3 2026
FORECAST IS BASED ON FORECAST START TIME OF 0600 PDT ON SEPTEMBER 04.
DISCUSSION
209: COOL AND WET WEATHER CONTINUED ON THURSDAY WITH HIGHS IN THE
50S. RELATIVE HUMIDITY RECOVERIES WEDNESDAY MORNING WERE
EXCELLENT. MINIMUM RELATIVE HUMIDITIES RANGED FROM 50 TO 60
PERCENT. SHOWERS WERE OBSERVED AROUND THE FIRE THROUGH MUCH OF
WEDNESDAY NIGHT INTO EARLY THURSDAY MORNING.
RAIN CHANCES CONTINUE FRIDAY, BUT WILL BE LIGHTER AND MORE SPOTTY
IN NATURE WITH ONLY A 5 PERCENT CHANCE OF A WETTING RAIN. MORE
WIDESPREAD RAINS RETURN SATURDAY WITH A 50 PERCENT CHANCE OF A
WETTING RAIN. THE CONTINUED COOLER AND WETTER CONDITIONS WILL KEEP
FIRE RISK LOW. WINDS WILL BE BREEZY OUT OF THE SOUTHWEST ON
FRIDAY FOR THE RIDGETOPS.
SPOT DISCUSSION: WEATHER REMAINS MUCH COOLER AND WETTER THROUGH
SATURDAY. SPOTTY LIGHT SHOWERS ARE EXPECTED FRIDAY AND FRIDAY
NIGHT WITH LOW BUT NONZERO CHANCES FOR THUNDERSTORMS. MORE
WIDESPREAD SHOWERS ARE FORECAST TO MOVE OVER THE FIRE SATURDAY
WITH A 15 PERCENT CHANCE OF THUNDERSTORMS IN THE AFTERNOON. GUSTY
OUTFLOW WINDS UP TO 30 MPH WILL BE A CONCERN WITH ANY
THUNDERSTORMS THAT DEVELOP.
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).
***************************************************************
FRIDAY
SKY/WEATHER.........CLOUDY. 30 PERCENT CHANCE OF RAIN SHOWERS IN
THE MORNING DECREASING TO A 15 PERCENT CHANCE
AFTER 1100 HOURS.
CWR.................5 PERCENT.
CHANCE OF LIGHTNING.5 PERCENT.
MAX TEMPERATURE.....RIDGETOPS.......48.
VALLEY BOTTOM...59.
MIN HUMIDITY........62-66 PERCENT.
WIND (20 FT)........RIDGETOPS........EAST 4-7 MPH IN THE
EARLY MORNING SHIFTING TO THE
SOUTHWEST 8-11 MPH AFTER 0800,
THEN REMAINING OUT OF THE
SOUTHWEST AND INCREASING TO
14-18 MPH AFTER 1100.
VALLEY BOTTOMS...DOWNSLOPE AND DOWNVALLEY
3-6 MPH IN THE EARLY MORNING
SHIFTING TO THE
WEST-SOUTHWEST WITH SIMILAR
SPEEDS AFTER 0800.
MIXING HEIGHT.......INCREASING TO 4000 FT AGL IN THE AFTERNOON.
TRANSPORT WINDS.....VARIABLE WINDS 4-7 MPH IN THE EARLY MORNING
BECOMING SOUTHWEST 18-22 MPH AFTER 0800.
VENTILATION INDEX...MODERATE (366).
FRIDAY NIGHT
SKY/WEATHER.........PARTLY CLOUDY. 15 PERCENT CHANCE OF RAIN
SHOWERS THROUGH THE NIGHT.
CWR.................5 PERCENT.
CHANCE OF LIGHTNING.5 PERCENT.
MIN TEMPERATURE.....34-40.
MAX HUMIDITY........96-100 PERCENT.
WIND (20 FT)........DOWNSLOPE AND DOWNVALLEY 4-7 MPH.
MIXING HEIGHT.......FALLING TO 500 FT AGL AROUND 2000.
TRANSPORT WINDS.....SOUTHWEST 7-10 MPH IN THE EVENING BECOMING
VARIABLE 4-7 MPH AFTER 2100.
VENTILATION INDEX...LOW (169).
SATURDAY
SKY/WEATHER.........PARTLY CLOUDY. 60 PERCENT CHANCE OF RAIN
SHOWERS THROUGH THE DAY. 15 PERCENT CHANCE OF
THUNDERSTORMS AFTER 1100 HOURS INCREASING TO
A 25 PERCENT CHANCE AFTER 1400 HOURS.
CWR.................50 PERCENT.
CHANCE OF LIGHTNING.15 PERCENT AFTER 1100 HOURS INCREASING TO 25
PERCENT AFTER 1400 HOURS.
MAX TEMPERATURE.....RIDGETOPS.......52.
VALLEY BOTTOM...61.
MIN HUMIDITY........72-76 PERCENT.
WIND (20 FT)........NORTHEAST WINDS 4-8 MPH. GUSTY AND ERRATIC
WINDS EXPECTED NEAR THUNDERSTORMS IN THE
AFTERNOON.
MIXING HEIGHT.......INCREASING TO 3500 FT AGL IN THE AFTERNOON.
TRANSPORT WINDS.....NORTHEAST 4-8 MPH SHIFTING TO THE SOUTHEAST
8-11 MPH IN THE AFTERNOON.
VENTILATION INDEX...MODERATE (252).
FORECASTER...RFKS
REQUESTED BY...WENDY
TYPE OF REQUEST...WILDFIRE
.TAG 2620106.14/OTX
.DELDT 09/03/26
.FORMATTERVERSION 2.0.0
.EMAIL IDCDC@FIRENET.GOV,2026.UPPERSMITH.PLANS@FIRENET.GOV
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