174
FNUS76 KOTX 290055
FWSOTX
SPOT FORECAST FOR PORCUPINE...USFS
NATIONAL WEATHER SERVICE SPOKANE WA
555 PM PDT TUE JUL 28 2026
FORECAST IS BASED ON FORECAST START TIME OF 1800 PDT ON JULY 28.
DISCUSSION
BREEZY WINDS CONTINUE THROUGH 2000 HOURS TONIGHT BEFORE BECOMING
LIGHT AND TERRAIN DRIVEN OVERNIGHT. WEATHER WILL TREND WARMER AND
DRIER WEDNESDAY AND THURSDAY. WINDS WILL BE TERRAIN DRIVEN AT
NIGHT AND IN THE EARLY MORNING WITH SOUTHWEST WINDS IN THE LATE
MORNING AND AFTERNOONS. TEMPERATURES WILL PEAK ON FRIDAY BEFORE A
DRY COLD FRONT PASSAGE ARRIVES ON SATURDAY. STRONGER WINDS ARE
EXPECTED FOR SATURDAY WITH SOUTHWEST WIND GUSTS UP TO 30 MPH.
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 OVERNIGHT.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MIN TEMPERATURE.....52.
MAX HUMIDITY........55-60 PERCENT.
WIND (20 FT)........SOUTHWEST WINDS 8 TO 11 MPH WITH GUSTS UP TO 23 MPH
THOUGH 2000 HOURS. THEN DECREASING TO VARIABLE
1 TO 4 MPH.
MIXING HEIGHT.......FALLING TO NEAR SURFACE AFTER 1900 HOURS.
TRANSPORT WINDS.....SOUTHWEST 7 TO 11 MPH.
VENTILATION INDEX...HIGH (710) DECREASING TO LOW (33) OVERNIGHT.
WEDNESDAY
SKY/WEATHER.........SUNNY. HAZE.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MAX TEMPERATURE.....71.
MIN HUMIDITY........28-33 PERCENT.
WIND (20 FT)........WINDS INCREASING TO SOUTHWEST 5 TO 7 MPH
AROUND 0900 HOURS. GUSTS UP TO 15 MPH IN
THE AFTERNOON.
MIXING HEIGHT.......INVERSION LIFTING BETWEEN 0800-0900 HOURS.
MIXING HEIGHT AS HIGH AS 4500 FT AGL IN THE
AFTERNOON.
TRANSPORT WINDS.....SOUTHWEST 9 TO 12 MPH.
VENTILATION INDEX...MODERATE (332) INCREASING TO HIGH (528) IN THE
AFTERNOON.
WEDNESDAY NIGHT
SKY/WEATHER.........MOSTLY CLEAR. HAZE IN THE EVENING.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MIN TEMPERATURE.....51.
MAX HUMIDITY........50-55 PERCENT.
WIND (20 FT)........SOUTHWEST WINDS 5 TO 7 MPH THROUGH 2000 HOURS,
THEN BECOMING VARIABLE 1 TO 3 MPH.
MIXING HEIGHT.......FALLING TO NEAR SURFACE AFTER 1900 HOURS.
TRANSPORT WINDS.....SOUTHWEST 4 TO 6 MPH.
VENTILATION INDEX...MODERATE (313) DECREASING TO LOW (25)
OVERNIGHT.
THURSDAY
SKY/WEATHER.........SUNNY.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MAX TEMPERATURE.....75.
MIN HUMIDITY........23-28 PERCENT.
WIND (20 FT)........VARIABLE 1 TO 3 MPH IN THE MORNING BECOMING
SOUTHWEST 4 TO 6 MPH IN THE AFTERNOON. GUSTS
TO 13 MPH IN THE AFTERNOON.
MIXING HEIGHT.......7500 FT AGL IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTHWEST 6 TO 11 MPH.
VENTILATION INDEX...MODERATE (236) INCREASING TO HIGH (545) IN THE
AFTERNOON.
FORECASTER...VT
REQUESTED BY...MAURICE THEARD
TYPE OF REQUEST...WILDFIRE
.TAG 2618545.0/OTX
.DELDT 07/28/26
.FORMATTERVERSION 2.0.0
.EMAIL IDCDC@FIRENET.GOV
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