975
FNUS76 KOTX 061012
FWSOTX
SPOT FORECAST FOR BOTTOM CANYON RX UNIT 26...USFS
NATIONAL WEATHER SERVICE SPOKANE WA
312 AM PDT WED MAY 6 2026
FORECAST IS BASED ON IGNITION TIME OF 1000 PDT ON MAY 06.
DISCUSSION
BREEZY SOUTHWEST WINDS WILL DEVELOP OVER THE BURN SITE THIS
AFTERNOON INTO TONIGHT AS A DRY COLD FRONT PASSES THROUGH.
THE STRONGEST WINDS WILL OCCUR THIS EVENING WITH GUSTS UP
TO 25 MPH. SLIGHT COOLING ALONG WITH AN INCREASE IN RELATIVE
HUMIDITY IS EXPECTED WITH THIS FRONT PASSAGE BUT WITH NO
PRECIPITATION.
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.........MOSTLY SUNNY.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.5 PERCENT.
MAX TEMPERATURE.....AROUND 67.
MIN HUMIDITY........35-40 PERCENT.
WIND (20 FT)........SOUTHWEST WINDS 3 TO 8 MPH IN THE MORNING
INCREASING TO 6 TO 12 MPH WITH GUSTS UP TO 22 MPH
IN THE AFTERNOON.
MIXING HEIGHT.......INCREASING TO 5000 FEET AGL IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTH 4 TO 9 MPH IN THE MORNING THEN WEST
10 TO 15 MPH IN THE AFTERNOON.
VENTILATION INDEX...LOW (260) INCREASING TO HIGH (680) IN THE
AFTERNOON.
TONIGHT
SKY/WEATHER.........PARTLY CLOUDY THEN BECOMING MOSTLY CLEAR.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.5 PERCENT.
MIN TEMPERATURE.....43-46.
MAX HUMIDITY........77-84 PERCENT.
WIND (20 FT)........SOUTHWEST 10 TO 16 MPH WITH GUSTS UP TO 25 MPH
IN THE EVENING DECREASING TO 6 TO 12 MPH
OVERNIGHT.
MIXING HEIGHT.......DECREASING TO 500 FEET AGL BY 2100.
TRANSPORT WINDS.....SOUTHWEST 7 TO 16 MPH.
VENTILATION INDEX...HIGH (518) FALLING TO LOW (20).
THURSDAY
SKY/WEATHER.........MOSTLY SUNNY.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MAX TEMPERATURE.....AROUND 66.
MIN HUMIDITY........41-46 PERCENT.
WIND (20 FT)........SOUTHWEST WINDS 4 TO 8 MPH.
MIXING HEIGHT.......500 FEET AGL THROUGH 0800 INCREASING TO
5500 FEET AGL IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTHWEST AROUND 10 MPH.
VENTILATION INDEX...HIGH (550).
FORECASTER...JW
REQUESTED BY...EVAN RATCLIFFE
TYPE OF REQUEST...PRESCRIBED
.TAG 2612867.0/OTX
.DELDT 05/06/26
.FORMATTERVERSION 2.0.0
.EMAIL EVAN.A.RATCLIFFE@USDA.GOV
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