347
FNUS76 KPDT 041140
FWSPDT
SPOT FORECAST FOR SUMMIT 18 RX...USFS
NATIONAL WEATHER SERVICE PENDLETON OR
440 AM PDT SUN OCT 4 2026
FORECAST IS BASED ON IGNITION TIME OF 0800 PDT ON OCTOBER 04.
***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 TRANSPORT WIND
MULTIPLIED BY THE MIXING HEIGHT IN 100'S OF FT.
CATEGORIES ARE A GENERALIZED INDICATOR ONLY:
LOW (< 200), MODERATE (200-500), HIGH (500-700),
AND VERY HIGH (> 700). ***
IF YOU HAVE QUESTIONS OR CONCERNS WITH THIS FORECAST, PLEASE
CONTACT OUR OFFICE AT (541) 276-8134.
DISCUSSION
LIGHT WINDS ARE EXPECTED THROUGH THE FORECAST WITH MINIMUM
RELATIVE HUMIDITY THIS AFTERNOON AS LOW AS 15 PERCENT.
RELATIVE HUMIDITY WILL RECOVER TO AROUND 43 PERCENT
OVERNIGHT.
TODAY
SKY/WEATHER.........SUNNY (10-20 PERCENT).
CWR.................0 PERCENT.
MAX TEMPERATURE.....AROUND 80.
MIN HUMIDITY........14-19 PERCENT.
WIND (20 FT)........LIGHT WINDS BECOMING SOUTH 5 TO 7 MPH IN THE
LATE MORNING AND AFTERNOON.
RIDGETOP WIND.......LIGHT WINDS BECOMING SOUTH 6 TO 8 MPH IN THE
LATE MORNING AND AFTERNOON.
MIXING HEIGHT.......5200 FT AGL.
TRANSPORT WINDS.....SOUTH 7 TO 9 MPH SHIFTING TO THE SOUTHWEST 8 TO
12 MPH LATE IN THE AFTERNOON.
VENTILATION INDEX...LOW (40) INCREASING TO MODERATE (340) IN THE
AFTERNOON.
TIME (PDT) 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM 6PM 7PM
TEMP............53 59 69 74 77 78 78 78 77 76 73 68
RH..............47 40 31 25 23 20 19 18 17 19 24 26
20 FT WIND DIR..SE SE S S S S S S S S SW N
20 FT WIND SPD..4 4 5 6 7 7 7 7 6 5 4 2
20 FT WIND GUST.5 6 6 7 10 10 10 10 10 7 5
TONIGHT
SKY/WEATHER.........PARTLY CLOUDY (40-50 PERCENT) THEN BECOMING
MOSTLY CLOUDY (50-60 PERCENT).
CWR.................0 PERCENT.
MIN TEMPERATURE.....50-53.
MAX HUMIDITY........41-46 PERCENT.
WIND (20 FT)........LIGHT WINDS.
RIDGETOP WIND.......LIGHT WINDS.
MIXING HEIGHT.......1700 FT AGL EARLY IN THE EVENING.
TRANSPORT WINDS.....SOUTHWEST AROUND 8 MPH SHIFTING TO THE
NORTHWEST 6 TO 9 MPH EARLY IN THE EVENING.
VENTILATION INDEX...LOW (50) DECREASING TO LOW (30) OVERNIGHT.
MONDAY
SKY/WEATHER.........PARTLY SUNNY (50-60 PERCENT) THEN BECOMING
SUNNY (10-20 PERCENT).
CWR.................0 PERCENT.
MAX TEMPERATURE.....AROUND 80.
MIN HUMIDITY........13-18 PERCENT.
WIND (20 FT)........LIGHT WINDS BECOMING NORTHWEST 4 TO 7 MPH LATE
IN THE MORNING.
RIDGETOP WIND.......LIGHT WINDS BECOMING NORTHWEST 5 TO 9 MPH LATE
IN THE MORNING.
MIXING HEIGHT.......6500 FT AGL EARLY IN THE MORNING.
TRANSPORT WINDS.....WEST 9 TO 14 MPH.
VENTILATION INDEX...LOW (60) INCREASING TO HIGH (650) IN THE
AFTERNOON.
FORECASTER...RUSSELL
REQUESTED BY...JESSE RIGEL
TYPE OF REQUEST...PRESCRIBED
.TAG 2622922.2/PDT
.DELDT 10/04/26
.FORMATTERVERSION 2.0.0
.EMAIL JESSE.RIGEL@USDA.GOV
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page