004
FNUS76 KOTX 062119
FWSOTX
SPOT FORECAST FOR SILVER FIRE...USFS
NATIONAL WEATHER SERVICE SPOKANE WA
219 PM PDT SUN SEP 6 2026
FORECAST IS BASED ON FORECAST START TIME OF 1800 PDT ON SEPTEMBER 06.
DISCUSSION
A WET PERIOD IS FORECAST FOR THE FIRE STARTING TONIGHT (SUNDAY NIGHT)
AND PERSISTING THROUGH MONDAY NIGHT. THERE WILL ALSO BE A 40 PERCENT
CHANCE FOR THUNDERSTORMS SUNDAY EVENING, AND 20 PERCENT FOR MONDAY.
FROM 5 PM SUNDAY THROUGH 5 AM TUESDAY, THERE IS A 90 PERCENT CHANCE OF
0.50 INCHES OF RAIN OR MORE ON THE FIRE, 70 PERCENT CHANCE OF GREATER
THAN 1 INCH, AND A 30 PERCENT CHANCE OF GREATER THAN 1.5 INCHES.
THERE IS A CHANCE OF RAIN SHOWERS PERSISTING INTO TUESDAY BEFORE
WARMER AND DRIER CONDITIONS FOR WEDNESDAY.
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).
***************************************************************
TONIGHT
SKY/WEATHER.........CLOUDY. CHANCE OF THUNDERSTORMS IN THE EVENING.
RAIN SHOWERS THROUGH THE NIGHT.
CWR.................80 PERCENT.
CHANCE OF LIGHTNING.40 PERCENT.
MIN TEMPERATURE.....RIDGETOP (AT 7000 FT)........40.
MIDSLOPE (AT 5500 FT)........44.
VALLEY BOTTOM (AT 3600 FT)...47.
MAX HUMIDITY........92-100 PERCENT.
WIND (20 FT)........RIDGE TOPS...NORTH TO NORTHEAST 3 TO 8 MPH SHIFTING
TO WEST 2 TO 5 MPH OVERNIGHT.
VALLEY BOTTOM/MID SLOPES...DOWNSLOPE-DOWNVALLEY
WINDS 2 TO 4 MPH. GUSTY AND ERRATIC WINDS
POSSIBLE NEAR THUNDERSTORMS.
MIXING HEIGHT.......NEAR SURFACE.
TRANSPORT WINDS.....EAST AROUND 7 MPH SHIFTING TO THE NORTHWEST
AROUND 5 MPH OVERNIGHT.
VENTILATION INDEX...LOW (85).
LABOR DAY
SKY/WEATHER.........CLOUDY. PATCHY FOG IN THE MORNING. RAIN SHOWERS
AND SLIGHT CHANCE OF THUNDERSTORMS THROUGH THE
DAY.
CWR.................85 PERCENT.
CHANCE OF LIGHTNING.20 PERCENT.
MAX TEMPERATURE.....RIDGETOP (AT 7000 FT)........42.
MIDSLOPE (AT 5500 FT)........48.
VALLEY BOTTOM (AT 3600 FT)...55.
MIN HUMIDITY........RIDGETOPS (AT 7000 FT).......85-95 PERCENT.
MIDSLOPE (AT 5500 FT)........75-85 PERCENT.
VALLEY BOTTOM (AT 3600 FT)...65-75 PERCENT.
WIND (20 FT)........LIGHT WINDS BECOMING SOUTHWEST 3 TO 8 MPH WITH
GUSTS UP TO 15 MPH IN THE AFTERNOON EXCEPT SOUTHWEST
10 TO 20 MPH WITH GUSTS UP TO 25 MPH ON EXPOSED
RIDGES ABOVE 6000 FEET. GUSTY AND ERRATIC WINDS
POSSIBLE NEAR THUNDERSTORMS.
MIXING HEIGHT.......NEAR SURFACE THROUGH 0900 INCREASING TO 2000 FT AGL
IN THE AFTERNOON.
TRANSPORT WINDS.....WEST 8 TO 12 MPH.
VENTILATION INDEX...LOW (181).
MONDAY NIGHT
SKY/WEATHER.........CLOUDY. RAIN.
CWR.................75 PERCENT.
CHANCE OF LIGHTNING.10 PERCENT.
MIN TEMPERATURE.....RIDGETOP (AT 7000 FT)........39.
MIDSLOPE (AT 5500 FT)........43.
VALLEY BOTTOM (AT 3600 FT)...46.
MAX HUMIDITY........92-100 PERCENT.
WIND (20 FT)........SOUTHWEST 4 TO 9 MPH WITH GUSTS UP TO 15 MPH
THROUGH 2000 DECREASING TO 2 TO 7 MPH.
MIXING HEIGHT.......500 FT AGL.
TRANSPORT WINDS.....WEST 5 TO 10 MPH.
VENTILATION INDEX...LOW (61).
TUESDAY
SKY/WEATHER.........PARTLY SUNNY. CHANCE OF RAIN SHOWERS IN THE
MORNING, THEN SLIGHT CHANCE OF RAIN SHOWERS IN
THE AFTERNOON.
CWR.................10 PERCENT.
CHANCE OF LIGHTNING.5 PERCENT.
MAX TEMPERATURE.....RIDGETOP (AT 7000 FT)........48.
MIDSLOPE (AT 5500 FT)........56.
VALLEY BOTTOM (AT 3600 FT)...63.
MIN HUMIDITY........RIDGETOPS (AT 7000 FT).......60-70 PERCENT.
MIDSLOPE (AT 5500 FT)........52-60 PERCENT.
VALLEY BOTTOM (AT 3600 FT)...45-52 PERCENT.
WIND (20 FT)........SOUTHWEST 3 TO 8 MPH.
MIXING HEIGHT.......500 FT AGL THROUGH 1000 INCREASING TO 3000 FT AGL
IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTHWEST 5 TO 10 MPH.
VENTILATION INDEX...LOW (132) INCREASING TO MODERATE (283) IN THE
AFTERNOON.
FORECASTER...JW
REQUESTED BY...BRUCE GIERSDORF
TYPE OF REQUEST...WILDFIRE
.TAG 2620738.9/OTX
.DELDT 09/06/26
.FORMATTERVERSION 2.0.0
.EMAIL BGIERSDORF@YAHOO.COM
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