780
FNUS76 KPDT 081504
FWSPDT
SPOT FORECAST FOR BIG LAKE...USFS
NATIONAL WEATHER SERVICE PENDLETON OR
804 AM PDT MON SEP 8 2025
FORECAST IS BASED ON FORECAST START TIME OF 0900 PDT ON SEPTEMBER 08.
***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
COOLER TEMPERATURES WITH SHOWERS AND LOW (20 TO 30 PERCENT)
CHANCES OF THUNDERSTORMS ARE EXPECTED OVER THE NEXT FEW DAYS.
WINDS WILL BE RELATIVELY LIGHT OUTSIDE OF ANY THUNDERSTORMS. DUE TO THE
INCREASED RAIN CHANCES, RH VALUES WILL BE RISING AS WELL WITH MIN RH
VALUES AROUND 30 TO 35 PERCENT TODAY AND AROUND 50 TO 55 PERCENT ON TUESDAY,
WITH EXCELLENT RECOVERIES OVERNIGHT.
TODAY
SKY/WEATHER.........PARTLY SUNNY (50-60 PERCENT). CHANCE OF RAIN
SHOWERS (30%) AND SLIGHT CHANCE (20%) OF
THUNDERSTORMS LATE IN THE AFTERNOON.
CWR.................5 PERCENT.
CHANCE OF LIGHTNING.17 PERCENT.
MAX TEMPERATURE.....AROUND 80.
MIN HUMIDITY........31-36 PERCENT.
WIND (20 FT)........WEST WINDS 5 TO 8 MPH. GUSTY AND ERRATIC WINDS
EXPECTED NEAR THUNDERSTORMS LATE IN THE
AFTERNOON.
RIDGETOP WIND.......WEST TO NORTHWEST WIND 5 TO 10 MPH.
MIXING HEIGHT.......5600 FT AGL.
TRANSPORT WINDS.....WEST 6 TO 13 MPH.
VENTILATION INDEX...POOR (100) INCREASING TO FAIR (270) IN THE
AFTERNOON.
TIME (PDT) 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM 6PM 7PM 8PM
CHC OF LTNG (%).0 0 0 0 0 10 10 10 20 20 20 10
TEMP............55 62 66 72 74 76 77 76 75 73 69 66
RH..............80 66 57 47 41 37 37 39 40 46 51 60
20 FT WIND DIR..W W W W W W W W W W W W
20 FT WIND SPD..5 5 5 5 5 6 6 6 7 7 7 5
20 FT WIND GUST.7 7 10 10 10 11 11 11 11 11 11 10
TONIGHT
SKY/WEATHER.........MOSTLY CLOUDY (70-80 PERCENT). SLIGHT CHANCE OF
THUNDERSTORMS (20%) EARLY IN THE EVENING. CHANCE OF
RAIN SHOWERS (40%) THROUGH THE NIGHT.
CWR.................10 PERCENT.
CHANCE OF LIGHTNING.17 PERCENT.
MIN TEMPERATURE.....49-52.
MAX HUMIDITY........95-100 PERCENT.
WIND (20 FT)........WEST WINDS 5 TO 8 MPH IN THE EVENING AND
OVERNIGHT BECOMING LIGHT. GUSTY AND ERRATIC
WINDS EXPECTED NEAR THUNDERSTORMS EARLY IN THE
EVENING.
RIDGETOP WIND.......WEST TO NORTHWEST WIND 5 TO 10 MPH INCREASING TO AROUND
10 MPH AND BECOMING EAST BY MORNING.
MIXING HEIGHT.......1100 FT AGL.
TRANSPORT WINDS.....WEST 8 TO 14 MPH.
VENTILATION INDEX...FAIR (230) DECREASING TO POOR (90) OVERNIGHT.
TUESDAY
SKY/WEATHER.........MOSTLY CLOUDY (65-75 PERCENT) THEN BECOMING
MOSTLY SUNNY (45-55 PERCENT). SLIGHT CHANCE OF
THUNDERSTORMS (20%) IN THE MORNING. RAIN SHOWERS
LIKELY (70%) THROUGH THE DAY. CHANCE (30%) OF
THUNDERSTORMS IN THE AFTERNOON. HAZE LATE IN THE
MORNING.
CWR.................10 PERCENT INCREASING TO 42 PERCENT LATE IN THE
MORNING, THEN DECREASING TO 4 PERCENT LATE IN
THE AFTERNOON.
CHANCE OF LIGHTNING.30 PERCENT.
MAX TEMPERATURE.....70-73.
MIN HUMIDITY........53-58 PERCENT.
WIND (20 FT)........LIGHT WINDS BECOMING NORTHWEST 5 TO 8 MPH LATE
IN THE MORNING. GUSTY AND ERRATIC WINDS
EXPECTED NEAR THUNDERSTORMS LATE IN THE
MORNING. GUSTY AND ERRATIC WINDS EXPECTED NEAR
THUNDERSTORMS LATE IN THE AFTERNOON.
RIDGETOP WIND.......VARIABLE, BECOMING NORTHWEST 5 TO 10 MPH IN THE
AFTERNOON.
MIXING HEIGHT.......4000 FT AGL.
TRANSPORT WINDS.....WEST 5 TO 9 MPH.
VENTILATION INDEX...POOR (90) INCREASING TO POOR (150) IN THE
AFTERNOON.
FORECASTER...NIERENBERG
REQUESTED BY...LUIS SIERRA
TYPE OF REQUEST...WILDFIRE
.TAG 2521557.0/PDT
.DELDT 09/08/25
.FORMATTERVERSION 2.0.0
.EMAIL LUIS_SIERRA@FIRENET.GOV
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