261
FNUS76 KOTX 260151
FWSOTX
SPOT FORECAST FOR PORCUPINE...USFS
NATIONAL WEATHER SERVICE SPOKANE WA
651 PM PDT SAT JUL 25 2026
FORECAST IS BASED ON FORECAST START TIME OF 1800 PDT ON JULY 25.
..RED FLAG WARNING IN EFFECT UNTIL 10 PM PDT THIS EVENING
DISCUSSION
FIRE AREA WILL SEE WINDS DECREASE THROUGH THE NIGHT AND DIRECTIONS
WILL STAY SOUTHERLY, THOUGH TRANSPORT WINDS WILL REMAIN OUT OF THE
SOUTHWEST. SURFACE WINDS TOMORROW SHIFT BACK TO THE SOUTHWEST IN
THE EARLY MORNING AND WIND GUSTS WILL BE STRONGEST BETWEEN 1000-2000.
TOMORROW NIGHT, WINDS WILL BECOME LIGHT AND SOUTHERLY. WITH THE
DRIER AIR MASS HAVING MOVED IN, RELATIVE HUMIDITY VALUES WILL BE
LOWER TOMORROW THAN THEY WERE TODAY.
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.........MOSTLY CLEAR. HAZE AND SMOKE.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MIN TEMPERATURE.....52.
MAX HUMIDITY........55-60 PERCENT.
WIND (20 FT)........SOUTH SOUTHWEST WINDS 5-10 MPH SHIFTING TO
MOSTLY SOUTH 2-5 MPH AROUND 0400.
MIXING HEIGHT.......FALLING TO NEAR SURFACE AROUND 1900.
TRANSPORT WINDS.....SOUTHWEST AROUND 15 MPH.
VENTILATION INDEX...VERY HIGH (1155) DECREASING TO LOW (54)
OVERNIGHT.
SUNDAY
SKY/WEATHER.........SUNNY.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MAX TEMPERATURE.....71.
MIN HUMIDITY........35-40 PERCENT.
WIND (20 FT)........SOUTH 2-5 MPH SHIFTING TO THE SOUTHWEST AND INCREASING
TO 5-10 MPH AROUND 0800. WIND GUSTS INCREASING TO 15-20 MPH
AROUND 1000.
MIXING HEIGHT.......INVERSION BREAKING AROUND 0700 AND INCREASING TO
5000 FT AGL IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTHWEST AROUND 15 MPH.
VENTILATION INDEX...MODERATE (303) INCREASING TO HIGH (754) IN THE
AFTERNOON.
SUNDAY NIGHT
SKY/WEATHER.........MOSTLY CLEAR.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MIN TEMPERATURE.....55.
MAX HUMIDITY........45-50 PERCENT.
WIND (20 FT)........SOUTHWEST WINDS 5-10 MPH WITH GUSTS 15-20 MPH THROUGH
2000, THEN BECOMING LIGHT. SHIFTING TO THE SOUTH
AROUND 2300.
MIXING HEIGHT.......FALLING TO NEAR SURFACE AROUND 1900.
TRANSPORT WINDS.....SOUTHWEST AROUND 15 DECREASING TO AROUND 5-10 MPH
AROUND 2000.
VENTILATION INDEX...HIGH (541) DECREASING TO LOW (31) OVERNIGHT.
FORECASTER...AS/JCLEV
REQUESTED BY...CRYSTAL TAYLOR
TYPE OF REQUEST...WILDFIRE
.TAG 2618210.1/OTX
.DELDT 07/25/26
.FORMATTERVERSION 2.0.0
.EMAIL IDCDC@FIRENET.GOV
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