304
FNUS76 KPDT 130218
FWSPDT
SPOT FORECAST FOR BIG HOLE FIRE...US FOREST SERVICE
NATIONAL WEATHER SERVICE PENDLETON OR
718 PM PDT FRI SEP 12 2025
FORECAST IS BASED ON FORECAST START TIME OF 0600 PDT ON SEPTEMBER 13.
***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
DRY CONDITIONS WILL CONTINUE INTO SATURDAY, BEFORE
ANOTHER WEATHER SYSTEM ARRIVES DURING THE OVERNIGHT HOURS HEADING
INTO SUNDAY. THE CURRENT EXPECTATION IS THAT EVEN THOUGH THIS
SYSTEM MAY PRODUCE SOME ISOLATED THUNDERSTORMS, THE RAIN SHOWERS
MOVING THROUGH THE AREA WILL BE WETTING IN NATURE. WINDS WILL
INITIALLY BE LIGHT, BEFORE BECOMING LOCALLY BREEZY AS THE SYSTEM
PASSES THROUGH, ESPECIALLY IN THE VICINITY OF THUNDERSTORMS SHOULD
ANY OCCUR.
SATURDAY
SKY/WEATHER.........SUNNY (15-25 PERCENT) THEN BECOMING MOSTLY
CLOUDY (60-70 PERCENT).
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.3 PERCENT.
MAX TEMPERATURE.....AROUND 80.
MIN HUMIDITY........26-31 PERCENT.
WIND (20 FT)........LIGHT WINDS BECOMING SOUTHWEST 5 TO 8 MPH
LATE IN THE MORNING.
MIXING HEIGHT.......7900 FT AGL EARLY IN THE MORNING.
TRANSPORT WINDS.....WEST-SOUTHWEST AROUND 8 MPH.
VENTILATION INDEX...POOR (30) INCREASING TO GOOD (500) IN THE
AFTERNOON.
TIME (PDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
CHC OF LTNG (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............39 40 46 55 62 67 71 73 75 75 76 75
RH..............94 94 84 68 56 47 39 33 30 29 27 30
20 FT WIND DIR..N N SE SE S SW SW SW SW SW SW W
20 FT WIND SPD..3 3 4 4 4 5 5 5 6 6 6 6
20 FT WIND GUST. 6 6 6 10 10 10 11 11 11 11
SATURDAY NIGHT
SKY/WEATHER.........MOSTLY CLOUDY (65-75 PERCENT). CHANCE OF RAIN
SHOWERS (40-50 PERCENT) AND A SLIGHT CHANCE OF
THUNDERSTORMS (15-20 PERCENT), MAINLY OVERNIGHT.
CWR.................0 PERCENT INCREASING TO 48 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
OVERNIGHT.
MIXING HEIGHT.......900 FT AGL.
TRANSPORT WINDS.....NORTHWEST 7 TO 12 MPH.
VENTILATION INDEX...FAIR (270) DECREASING TO POOR (60) OVERNIGHT.
SUNDAY
SKY/WEATHER.........MOSTLY CLOUDY (60-70 PERCENT). CHANCE OF RAIN
SHOWERS (50-60 PERCENT) AND A SLIGHT CHANCE OF
THUNDERSTORMS (15-20 PERCENT), DECREASING
THROUGHOUT THE DAY.
CWR.................48 PERCENT DECREASING TO 8 PERCENT LATE IN THE
MORNING.
CHANCE OF LIGHTNING.19 PERCENT.
MAX TEMPERATURE.....64-67.
MIN HUMIDITY........43-48 PERCENT.
WIND (20 FT)........WEST-NORTHWEST WINDS 5 TO 10 MPH. GUSTS UP TO
20 MPH LATE IN THE AFTERNOON. GUSTY AND ERRATIC
WINDS EXPECTED NEAR THUNDERSTORMS.
MIXING HEIGHT.......3700 FT AGL.
TRANSPORT WINDS.....WEST-NORTHWEST 9 TO 16 MPH.
VENTILATION INDEX...POOR (150) INCREASING TO FAIR (330) IN THE
AFTERNOON.
FORECASTER...EVANS
REQUESTED BY...ELLA NICHOLS
TYPE OF REQUEST...WILDFIRE
.TAG 2521897.0/PDT
.DELDT 09/13/25
.FORMATTERVERSION 2.0.0
.EMAIL ELLA.NICHOLS12@GMAIL.COM,THOMAS.ALVUT@USDA.GOV
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