198
FNUS76 KOTX 060811
FWSOTX
SPOT FORECAST FOR NORTH SIWASH RX...USDA FOREST SERVICE
NATIONAL WEATHER SERVICE SPOKANE WA
111 AM PDT WED MAY 6 2026
FORECAST IS BASED ON IGNITION TIME OF 0600 PDT ON MAY 06.
DISCUSSION
WARM CONDITIONS REMAIN IN PLACE TODAY HOWEVER HUMIDITY VALUES WILL
BE INCREASING THROUGH THE AFTERNOON WITH THE ARRIVAL OF A DRY COLD
FRONT. LOWEST HUMIDITY VALUES DIP AROUND 1300 HRS THEN BEGIN TO
SLOWLY RISE. THE INCOMING FRONT WILL DELIVER INCREASING WESTERLY
WINDS TO THE RIDGETOP WITH MODERATE SHELTERING MID TO LOWER SLOPE
GIVEN THE EAST ASPECT. ANTICIPATE THE WINDS TO MIX DOWN TO THE
LOWER SLOPES AT TIMES 1600-2200. WINDS REMAIN ELEVATED ON THE
RIDGETOPS OVERNIGHT BUT LOOK TO DECOUPLE LOWER TO MID SLOPES.
CUMULUS CLOUDS WILL DEVELOP TODAY WITH A 5-10% CHANCE FOR A SHOWER.
LIGHTER WINDS, COOLER TEMPERATURES, AND HIGHER HUMIDITY FOR THURSDAY.
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.
***************************************************************
TODAY
SKY/WEATHER.........MOSTLY SUNNY BECOMING PARTLY CLOUDY.
CHANCE OF LIGHTNING.0 PERCENT.
MAX TEMPERATURE.....65.
MIN HUMIDITY........38-42 PERCENT INCREASING 45-48% BY 1700 HRS.
WIND (20 FT)........VARIABLE TO UPSLOPE WINDS 1 TO 4 MPH BECOMING WEST 5 TO 8 MPH
WITH GUSTS TO AROUND 16 MPH AFTER 1300. RIDGETOPS: WEST 4
TO 7 MPH INCREASING WEST 10 TO 15 MPH GUSTS 20 MPH AFTER
1300.
MIXING HEIGHT.......6500 FT AGL IN THE AFTERNOON BETWEEN 1300-1500.
TRANSPORT WINDS.....SOUTHWEST 5 MPH BECOMING WEST 16 MPH AFTER 1300.
TONIGHT
SKY/WEATHER.........MOSTLY CLOUDY THEN BECOMING MOSTLY CLEAR.
CHANCE OF LIGHTNING.5 PERCENT.
MIN TEMPERATURE.....42.
MAX HUMIDITY........71-76 PERCENT.
WIND (20 FT)........WEST WINDS 6 TO 9 MPH GUSTS 18 MPH BECOMING SOUTHWEST
4 TO 7 MPH AFTER 0100. RIDGETOPS 12 TO 18 MPH GUSTS
25 MPH BECOMING SOUTHWEST 8 TO 13 MPH AFTER MIDNIGHT.
MIXING HEIGHT.......4000 FT AGL FALLING TO NEAR SURFACE OVERNIGHT.
TRANSPORT WINDS.....SOUTHWEST 12 TO 14 MPH.
THURSDAY
SKY/WEATHER.........MOSTLY SUNNY.
MAX TEMPERATURE.....61.
MIN HUMIDITY........42-47 PERCENT.
WIND (20 FT)........WEST WINDS 4 TO 9 MPH GUSTS TO 14 MPH
IN THE AFTERNOON.
MIXING HEIGHT.......4500 FT AGL IN THE AFTERNOON.
TRANSPORT WINDS.....WEST 12 TO 14 MPH.
FORECASTER...SB
REQUESTED BY...CAPTAIN 21
TYPE OF REQUEST...PRESCRIBED
.TAG 2612874.0/OTX
.DELDT 05/06/26
.FORMATTERVERSION 2.0.0
.EMAIL RICHARD.LYONS@USDA.GOV,JUSTIN.COLVIN@USDA.GOV,WILL.DALBY@USDA.GOV,JERROD.SCHEFFELMAIER@USDA.GOV,MEGAN.PRIMMER@USDA.GOV
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page