972
FNUS76 KPDT 100152
FWSPDT
SPOT FORECAST FOR BIG HOLE FIRE...US FOREST SERVICE
NATIONAL WEATHER SERVICE PENDLETON OR
652 PM PDT TUE SEP 9 2025
FORECAST IS BASED ON FORECAST START TIME OF 0800 PDT ON SEPTEMBER 10.
***THUNDERSTORMS IMPLY GUSTY AND ERRATIC WINDS***
***WINDS ARE 20 FOOT 10-MINUTE AVERAGES***
***CWR-CHANCE OF WETTING RAIN 0.10 OR GREATER***
***VENTILATION INDEX IS DERIVED FROM THE
TRANSPORT WIND MULTIPLIED BY THE MIXING
HEIGHT IN 100'S OF FEET. INDEX CATEGORIES
ARE A GENERALIZED INDICATOR ONLY.***
IF YOU HAVE QUESTIONS OR CONCERNS WITH THIS FORECAST, PLEASE
CONTACT OUR OFFICE AT (541) 276-8134.
DISCUSSION
SHOWER AND THUNDERSTORM CHANCES WILL CONTINUE FOR
THE REGION AS A LOW PRESSURE SYSTEM MOVES INTO THE PACIFIC
NORTHWEST. RAIN CHANCES WILL BE AT THEIR GREATEST DURING THE DAY
WEDNESDAY, BEFORE SHOWER CHANCES GENERALLY START TO SHIFT
EASTWARD. ISOLATED STORMS ARE POSSIBLE, BUT ARE EXPECTED TO BE
WETTING IN NATURE SHOULD ANY OCCUR. WINDS WILL GENERALLY REMAIN
LIGHT OUT OF THE WEST-NORTHWEST OVER THE NEXT COUPLE OF DAYS.
WEDNESDAY
SKY/WEATHER.........MOSTLY CLOUDY (75-85 PERCENT). RAIN SHOWERS
LIKELY (70-80 PERCENT) AND A CHANCE OF
THUNDERSTORMS (25-35 PERCENT) THROUGHOUT THE
DAY.
CWR.................31 PERCENT INCREASING TO 70 PERCENT LATE IN THE
MORNING.
CHANCE OF LIGHTNING.35 PERCENT.
MAX TEMPERATURE.....64-67.
MIN HUMIDITY........59-64 PERCENT.
WIND (20 FT)........NORTHWEST WINDS 5 TO 8 MPH. GUSTY AND ERRATIC
WINDS EXPECTED NEAR THUNDERSTORMS.
MIXING HEIGHT.......2600 FT AGL.
TRANSPORT WINDS.....NORTH AROUND 7 MPH SHIFTING TO THE WEST
LATE IN THE AFTERNOON.
VENTILATION INDEX...POOR (40) INCREASING TO POOR (100) IN THE
AFTERNOON.
TIME (PDT) 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM 6PM 7PM
CHC OF LTNG (%).10 10 10 30 30 30 40 40 40 20 20 20
TEMP............45 50 55 60 63 64 64 61 64 63 63 58
RH..............99 98 84 74 66 64 64 68 64 69 65 73
20 FT WIND DIR..W W W NW NW NW NW NW NW W W W
20 FT WIND SPD..4 4 4 4 4 4 5 5 5 5 5 5
20 FT WIND GUST.6 6 6 8 8 8 10 10 10 10 10 10
WEDNESDAY NIGHT
SKY/WEATHER.........MOSTLY CLOUDY (80-90 PERCENT). RAIN SHOWERS
LIKELY (60-70 PERCENT) WITH A SLIGHT CHANCE
OF THUNDERSTORMS (15-25 PERCENT) EARLY IN
THE EVENING, THEN CHANCE OF SHOWERS (35-
45 PERCENT) OVERNIGHT.
CWR.................70 PERCENT DECREASING TO 8 PERCENT.
CHANCE OF LIGHTNING.22 PERCENT.
MIN TEMPERATURE.....40-43.
MAX HUMIDITY........95-100 PERCENT.
WIND (20 FT)........WEST-NORTHWEST WINDS 5 TO 8 MPH. GUSTY AND
ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS.
MIXING HEIGHT.......500 FT AGL.
TRANSPORT WINDS.....WEST-NORTHWEST 5 TO 12 MPH.
VENTILATION INDEX...POOR (130) DECREASING TO POOR (60) OVERNIGHT.
THURSDAY
SKY/WEATHER.........MOSTLY CLOUDY (65-75 PERCENT). CHANCE OF SHOWERS
(45-55 PERCENT) WITH A SLIGHT CHANCE OF
THUNDERSTORMS (15-25 PERCENT).
CWR.................8 PERCENT INCREASING TO 43 PERCENT LATE IN THE
MORNING, THEN DECREASING TO 3 PERCENT LATE IN
THE AFTERNOON.
CHANCE OF LIGHTNING.29 PERCENT.
MAX TEMPERATURE.....66-69.
MIN HUMIDITY........51-56 PERCENT.
WIND (20 FT)........NORTHWEST WINDS 5 TO 8 MPH. GUSTY AND ERRATIC
WINDS EXPECTED NEAR THUNDERSTORMS.
MIXING HEIGHT.......3400 FT AGL.
TRANSPORT WINDS.....NORTHWEST 9 TO 13 MPH.
VENTILATION INDEX...POOR (90) INCREASING TO FAIR (300) IN THE
AFTERNOON.
FORECASTER...EVANS
REQUESTED BY...ELLA NICHOLS
TYPE OF REQUEST...WILDFIRE
.TAG 2521684.0/PDT
.DELDT 09/10/25
.FORMATTERVERSION 2.0.0
.EMAIL ELLA.NICHOLS12@GMAIL.COM,THOMAS.ALVUT@USDA.GOV
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