973
FNUS76 KOTX 040838
FWSOTX
SPOT FORECAST FOR CHELAN HILLS...CWICC
NATIONAL WEATHER SERVICE SPOKANE WA
138 AM PDT SAT JUL 4 2026
FORECAST IS BASED ON FORECAST START TIME OF 0200 PDT ON JULY 04.
...RED FLAG WARNING IN EFFECT FROM 1 PM THIS AFTERNOON TO 9 PM
PDT THIS EVENING...
DISCUSSION
ELEVATED FIRE WEATHER CONDITIONS ARE EXPECTED FOR THE 4TH OF JULY
WITH HIGH TEMPERATURES AROUND 90, RELATIVE HUMIDITY BOTTOMING
OUT IN THE UPPER TEENS, AND SOUTHWEST WINDS OVERNIGHT. DRY COLD
FRONT WILL BRING GUSTY WINDS UP TO 30 MPH ON SATURDAY AFTERNOON
AND EARLY EVENING. DRIER, WARMER CONDITIONS EXPECTED ON SUNDAY
WITH CALMER WINDS.
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).
***************************************************************
REST OF TONIGHT
SKY/WEATHER.........MOSTLY CLOUDY.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MIN TEMPERATURE.....AROUND 55-60.
MAX HUMIDITY........50-55 PERCENT.
WIND (20 FT)........SOUTHWEST WINDS AROUND 4 TO 8 MPH WITH GUSTS
AROUND 15 MPH.
MIXING HEIGHT.......FALLING TO NEAR SURFACE.
TRANSPORT WINDS.....WEST AROUND 9 MPH.
VENTILATION INDEX...LOW (37).
TODAY
SKY/WEATHER.........SUNNY.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MAX TEMPERATURE.....AROUND 85-90.
MIN HUMIDITY........15-20 PERCENT.
WIND (20 FT)........WEST WINDS 10 TO 15 MPH. GUSTS UP TO 30 MPH
BEGINNING AROUND 1300.
MIXING HEIGHT.......NEAR SURFACE IN THE MORNING INCREASING TO 6500
FT AGL IN THE AFTERNOON.
TRANSPORT WINDS.....WEST AROUND 10 MPH INCREASING TO AROUND 25 MPH
IN THE AFTERNOON.
VENTILATION INDEX...HIGH (707) INCREASING TO VERY HIGH (1131) IN
THE AFTERNOON.
TONIGHT
SKY/WEATHER.........MOSTLY CLEAR.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MIN TEMPERATURE.....AROUND 50-55.
MAX HUMIDITY........56 PERCENT.
WIND (20 FT)........SOUTHWEST WINDS 7 TO 16 MPH WITH GUSTS TO
AROUND 23 MPH THROUGH 2100 SHIFTING TO THE
WEST 5 TO 6 MPH OVERNIGHT.
MIXING HEIGHT.......3500 FT AGL FALLING TO 500 FT AGL.
TRANSPORT WINDS.....WEST 7 TO 16 MPH.
VENTILATION INDEX...HIGH (640) DECREASING TO LOW (35) OVERNIGHT.
SUNDAY
SKY/WEATHER.........SUNNY.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MAX TEMPERATURE.....AROUND 87-92.
MIN HUMIDITY........10-15 PERCENT.
WIND (20 FT)........LIGHT WINDS.
MIXING HEIGHT.......4000 FT AGL INCREASING TO 8500 FT AGL IN THE
AFTERNOON.
TRANSPORT WINDS.....NORTH AROUND 7 MPH SHIFTING TO THE WEST IN THE
AFTERNOON.
VENTILATION INDEX...MODERATE (204) INCREASING TO HIGH (675) IN THE
AFTERNOON.
FORECASTER...JCLEV
REQUESTED BY...IADP
TYPE OF REQUEST...WILDFIRE
.TAG 2616739.0/OTX
.DELDT 07/04/26
.FORMATTERVERSION 2.0.0
.EMAIL WACWC@FIRENET.GOV
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