717
FNUS76 KPDT 090715
FWSPDT
SPOT FORECAST FOR BIG HOLE FIRE...US FOREST SERVICE
NATIONAL WEATHER SERVICE PENDLETON OR
1215 AM PDT TUE SEP 9 2025
FORECAST IS BASED ON FORECAST START TIME OF 0800 PDT ON SEPTEMBER 09.
***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
SHOWERS AND THUNDERSTORMS EXPECTED DAILY WITH
HIGHEST PRECIPITATION ACCUMULATIONS EXPECTED WEDNESDAY WITH
HIGH CONFIDENCE (70+%) IN WETTING RAINS. WINDS WILL BE GENERALLY
FROM THE WEST AND NORTHWEST TODAY THROUGH TONIGHT AND REMAIN BELOW
10 MPH. MIN RHS WILL BE IN THE MID 40S TO LOW 50S TOMORROW AND
INCREASING WEDNESDAY WITH EXCELLENT OVERNIGHT RECOVERIES.
REST OF TODAY
SKY/WEATHER.........PARTLY SUNNY (55-65 PERCENT). CHANCE OF RAIN
SHOWERS EARLY IN THE MORNING. CHANCE OF
THUNDERSTORMS THROUGH THE DAY. RAIN SHOWERS IN
THE AFTERNOON.
CWR.................3 PERCENT INCREASING TO 24 PERCENT LATE IN THE
MORNING, THEN DECREASING TO 8 PERCENT LATE IN
THE AFTERNOON.
CHANCE OF LIGHTNING.33 PERCENT.
MAX TEMPERATURE.....AROUND 70.
MIN HUMIDITY........45-50 PERCENT.
WIND (20 FT)........LIGHT WINDS BECOMING WEST 5 TO 7 MPH AROUND
11 AM, THEN SHIFTING TO THE NORTHWEST AROUND 5
MPH AROUND 5 PM. GUSTY AND ERRATIC WINDS EXPECTED
NEAR THUNDERSTORMS BEGINNING AROUND 11 AM AND
PERSISTING THROUGH 8 PM.
MIXING HEIGHT.......4900 FT AGL.
TRANSPORT WINDS.....SOUTHWEST 5 TO 10 MPH.
VENTILATION INDEX...POOR (50) INCREASING TO POOR (180) IN THE
AFTERNOON.
TIME (PDT) 8 AM 10 AM NOON 2 PM 4 PM 6 PM
CHC OF LTNG (%).10 10 30 30 30 20
TEMP............45 56 62 65 66 62
RH..............100 74 57 50 50 57
20 FT WIND......W 4 W 4 W 5 W 5 W 5 NW 5
20 FT WIND GUST.6 6 8 10 10 11
TONIGHT
SKY/WEATHER.........MOSTLY CLOUDY (75-85 PERCENT). CHANCE OF RAIN
SHOWERS AND SLIGHT CHANCE OF THUNDERSTORMS IN
THE EVENING, THEN SLIGHT CHANCE OF RAIN SHOWERS
OVERNIGHT.
CWR.................8 PERCENT.
CHANCE OF LIGHTNING.18 PERCENT.
MIN TEMPERATURE.....AROUND 40.
MAX HUMIDITY........95-100 PERCENT.
WIND (20 FT)........NORTHWEST WINDS 5 TO 7 MPH BECOMING LIGHT
OVERNIGHT. GUSTY AND ERRATIC WINDS
EXPECTED NEAR THUNDERSTORMS THROUGH 8PM.
MIXING HEIGHT.......500 FT AGL IN THE EVENING AND OVERNIGHT.
TRANSPORT WINDS.....NORTHWEST 6 TO 10 MPH.
VENTILATION INDEX...POOR (140) DECREASING TO POOR (30) OVERNIGHT.
WEDNESDAY
SKY/WEATHER.........MOSTLY CLOUDY (80-90 PERCENT). SLIGHT CHANCE OF
THUNDERSTORMS IN THE MORNING. RAIN SHOWERS
THROUGH THE DAY. CHANCE OF THUNDERSTORMS IN THE
AFTERNOON.
CWR.................0 PERCENT INCREASING TO 76 PERCENT LATE IN THE
MORNING, THEN DECREASING TO 62 PERCENT LATE IN
THE AFTERNOON.
CHANCE OF LIGHTNING.31 PERCENT.
MAX TEMPERATURE.....64-67.
MIN HUMIDITY........56-61 PERCENT.
WIND (20 FT)........LIGHT WINDS BECOMING NORTHWEST 5 TO 7 MPH AROUND
11 AM. GUSTY AND ERRATIC WINDS EXPECTED NEAR
THUNDERSTORMS LATE IN THE BEGINNING AROUND 11 AM
PERSISTING THROUGH 8 PM.
MIXING HEIGHT.......2500 FT AGL EARLY IN THE MORNING.
TRANSPORT WINDS.....NORTHWEST AROUND 6 MPH IN THE MORNING BECOMING
LIGHT, THEN BECOMING NORTH 7 TO 9 MPH LATE IN
THE AFTERNOON.
VENTILATION INDEX...POOR (40) INCREASING TO POOR (100) IN THE
AFTERNOON.
FORECASTER...BENNESE
REQUESTED BY...ELLA NICHOLS
TYPE OF REQUEST...WILDFIRE
.TAG 2521607.0/PDT
.DELDT 09/09/25
.FORMATTERVERSION 2.0.0
.EMAIL ELLA.NICHOLS12@GMAIL.COM,THOMAS.ALVUT@USDA.GOV
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