672
FNUS76 KOTX 050211
FWSOTX
SPOT FORECAST FOR CHELAN FALLS...SEWAIMT TEAM 1
NATIONAL WEATHER SERVICE SPOKANE WA
711 PM PDT SAT JUL 4 2026
FORECAST IS BASED ON FORECAST START TIME OF 0600 PDT ON JULY 05.
..RED FLAG WARNING IN EFFECT UNTIL 9 PM PDT THIS EVENING
DISCUSSION
CRITICAL FIRE WEATHER CONDITIONS EXPECTED ACROSS CENTRAL
WASHINGTON THROUGH THE REMAINDER OF THE INDEPENDENCE DAY
AFTERNOON AND INTO THE EARLY EVENING WITH TEMPERATURES IN THE MID
80S AND RELATIVE HUMIDITIES IN THE 15% TO 20% RANGE. A DRY COLD
FRONT MOVING THROUGH THE REGION WILL ALSO CONTINUE TO PRODUCE
BREEZY WINDS WITH GUSTS UP TO 30MPH DURING THIS TIME. PREVAILING
WINDS WILL BEGIN TO SUBSIDE AFTER SUNDOWN THIS EVENING AND TAKE ON
A MORE NORTHERLY COMPONENT TONIGHT, ESPECIALLY TO THE EAST OF THE
COLUMBIA RIVER. RELATIVE HUMIDITY RECOVERIES WILL BE GENERALLY
POOR WITH OVERNIGHT MAX RH VALUES OF 40% TO 55%.
DRY WEATHER WILL CONTINUE SUNDAY AND SUNDAY NIGHT WITH LIGHT
NORTHERLY WINDS PREVAILING. DAYTIME HIGH TEMPERATURES SUNDAY WILL
BE WITHIN A DEGREE OR TWO OF INDEPENDENCE DAY'S HIGHS, BUT RISE
TO THE MID/UPPER 90S FOR MONDAY (VALLEYS) AS WINDS BECOME SOUTHERLY.
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).
***************************************************************
SUNDAY
SKY/WEATHER.........SUNNY.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MAX TEMPERATURE.....AROUND 93 IN THE VALLEYS TO NEAT 79 AT THE RIDGETOPS.
MIN HUMIDITY........15 TO 20 PERCENT.
WIND (20 FT)........NORTH TO NORTHEAST WINDS 10 TO 17 MPH IN THE
MORNING, WITH THE HIGHER WINDS OBSERVED AT THE
RIDGE TOPS. WINDS BECOME LIGHT AND VARIABLE AFTER
1100 PDT.
MIXING HEIGHT.......4000FT AGL INCREASING TO 7000 FT AGL IN THE
AFTERNOON.
TRANSPORT WINDS.....NORTH AROUND 7 MPH SHIFTING TO THE WEST IN
THE AFTERNOON.
VENTILATION INDEX...LOW (189) INCREASING TO MODERATE (445) IN THE
AFTERNOON.
SUNDAY NIGHT
SKY/WEATHER.........MOSTLY CLEAR.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MIN TEMPERATURE.....AROUND 62 IN THE VALLEYS TO NEAR 55 AT THE RIDGETOPS.
MAX HUMIDITY........40 TO 45 PERCENT.
WIND (20 FT)........NORTHEAST WINDS 5 TO 6 MPH.
MIXING HEIGHT.......8000 FT AGL FALLING TO 500 FT AGL.
TRANSPORT WINDS.....NORTH 8 TO 10 MPH.
VENTILATION INDEX...VERY HIGH (803) DECREASING TO LOW (36)
OVERNIGHT.
MONDAY
SKY/WEATHER.........SUNNY.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MAX TEMPERATURE.....AROUND 98 IN THE VALLEYS TO NEAR 84 AT THE RIDGETOPS.
MIN HUMIDITY........13 TO 18 PERCENT.
WIND (20 FT)........NORTH WINDS 5 TO 6 MPH SHIFTING TO THE
SOUTHEAST IN THE AFTERNOON.
MIXING HEIGHT.......5000 FT AGL INCREASING TO 9500 FT AGL IN THE
AFTERNOON.
TRANSPORT WINDS.....NORTHEAST AROUND 8 MPH SHIFTING TO THE SOUTH IN
THE AFTERNOON.
VENTILATION INDEX...MODERATE (295) INCREASING TO HIGH (666) IN THE
AFTERNOON.
FORECASTER...PP
REQUESTED BY...BILL BOX
TYPE OF REQUEST...WILDFIRE
.TAG 2616779.0/OTX
.DELDT 07/04/26
.FORMATTERVERSION 2.0.0
.EMAIL BILL_BOX@FIRENET.GOV
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