885
FNUS76 KOTX 220224
FWSOTX
SPOT FORECAST FOR PORCUPINE...USFS
NATIONAL WEATHER SERVICE SPOKANE WA
724 PM PDT FRI AUG 21 2026
FORECAST IS BASED ON FORECAST START TIME OF 1900 PDT ON AUGUST 21.
..HEAT ADVISORY IN EFFECT UNTIL 10 PM PDT THIS EVENING
...RED FLAG WARNING IN EFFECT FROM 4 PM SATURDAY TO 11 AM PDT
SUNDAY...
DISCUSSION
MID AND HIGH CLOUDS CONTINUE TO BE THICKEN. THIS ACTIVITY HAS A
20% CHANCE TO PRODUCE SPRINKLES OVERNIGHT INTO EARLY SATURDAY
MORNING. ANY ACTIVITY WILL BE CAPABLE OF BRIEF ERRATIC WIND GUSTS
OF 15-20 MPH. THE THREAT FOR SHOWERS WILL MOVE OUT BY 0700 WITH A
15% CHANCE FOR THUNDERSTORMS IN THE AFTERNOON MAINLY BETWEEN
1700-2000, WITH CHANCES INCREASING TO 30% UNTIL 0800 SUNDAY. ANY
STORMS WILL BE CAPABLE OF GUSTY OUTFLOW WINDS AROUND 30-50 MPH AND
BRIEF RAIN WITH LOW PROBABILITIES FOR WETTING RAINS. WINDS
OVERALL WILL BE LIGHT BESIDES THUNDERSTORM OUTFLOWS. SUNDAY WILL
BE COOLER IN THE UPPER 60S.
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 CLOUDY. 10 PERCENT CHANCE OF SPRINKLES
FROM 0000-0700.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.5 PERCENT.
MIN TEMPERATURE.....70.
MAX HUMIDITY........40-45 PERCENT.
WIND (20 FT)........DOWNSLOPE/DOWNVALLEY WINDS 1-3 MPH. GUSTY AND
ERRATIC WINDS UP TO 20 MPH AROUND SPRINKLES.
MIXING HEIGHT.......NEAR SURFACE.
TRANSPORT WINDS.....NORTHEAST 7 TO 8 MPH.
VENTILATION INDEX...LOW (40).
SATURDAY
SKY/WEATHER.........MOSTLY CLOUDY BECOMING PARTLY CLOUDY IN THE EARLY
AFTERNOON. 15 PERCENT CHANCE OF THUNDERSTORMS
FROM 1700-2000 HOURS. THUNDERSTORMS WILL CARRY
LITTLE RAIN.
CWR.................5 PERCENT.
CHANCE OF LIGHTNING.15 PERCENT.
MAX TEMPERATURE.....85.
MIN HUMIDITY........28-33 PERCENT.
WIND (20 FT)........LIGHT AND VARIABLE WINDS 1-3 MPH. GUSTY AND ERRATIC
OUTFLOW WINDS AROUND 30-50 MPH AROUND THUNDERSTORMS.
MIXING HEIGHT.......4000 FT AGL.
TRANSPORT WINDS.....EAST AROUND 8 MPH SHIFTING TO THE SOUTH AROUND
9 MPH IN THE AFTERNOON.
VENTILATION INDEX...MODERATE (312) INCREASING TO HIGH (529) IN THE
AFTERNOON.
SATURDAY NIGHT
SKY/WEATHER.........MOSTLY CLOUDY. 30 PERCENT CHANCE OF THUNDERSTORMS
OVERNIGHT. THUNDERSTORMS WILL CONTAIN VERY BRIEF
HEAVY RAIN. TRAINING THUNDERSTORMS WILL LEAD
TO A WETTING RAIN.
CWR.................15 PERCENT.
CHANCE OF LIGHTNING.30 PERCENT.
MIN TEMPERATURE.....58.
MAX HUMIDITY........75-85 PERCENT.
WIND (20 FT)........SOUTHWEST WINDS 3 TO 6 MPH IN THE EVENING
BECOMING LIGHT. GUSTY AND ERRATIC OUTFLOW WINDS
AROUND 30-50 MPH AROUND THUNDERSTORMS.
MIXING HEIGHT.......FALLING TO NEAR SURFACE AROUND 1930.
TRANSPORT WINDS.....SOUTHWEST AROUND 7 MPH.
VENTILATION INDEX...LOW (189).
FORECASTER...DB
REQUESTED BY...IDCDC
TYPE OF REQUEST...WILDFIRE
.TAG 2620220.0/OTX
.DELDT 08/21/26
.FORMATTERVERSION 2.0.0
.EMAIL IDCDC@FIRENET.GOV
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page