005
FNUS76 KPDT 031156
FWSPDT
SPOT FORECAST FOR SUMMIT 18 RX...USFS
NATIONAL WEATHER SERVICE PENDLETON OR
456 AM PDT SAT OCT 3 2026
FORECAST IS BASED ON IGNITION TIME OF 0800 PDT ON OCTOBER 03.
***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
NO DRY THUNDERSTORM/CONVECTIVE RISK OVER THIS FORECAST PERIOD.
LIGHT WINDS WILL BE OUT OF THE SOUTH AS MINIMUM RELATIVE
HUMIDITY GETS AS LOW AS 17 PERCENT THIS AFTERNOON. LOOK FOR
AN OVERNIGHT RECOVERY TO AS MUCH AS 50 PERCENT RELATIVE HUMIDITY.
TODAY
SKY/WEATHER.........SUNNY (0-10 PERCENT).
CWR.................0 PERCENT.
MAX TEMPERATURE.....74-77.
MIN HUMIDITY........17-22 PERCENT.
WIND (20 FT)........LIGHT WINDS BECOMING SOUTH 5 TO 8 MPH IN THE
LATE MORNING AND AFTERNOON.
RIDGETOP WIND.......LIGHT WINDS BECOMING SOUTH 7 TO 10 MPH IN THE
LATE MORNING AND AFTERNOON.
MIXING HEIGHT.......4500 FT AGL.
TRANSPORT WINDS.....SOUTH 7 TO 10 MPH.
VENTILATION INDEX...LOW (40) INCREASING TO MODERATE (310) IN THE
AFTERNOON.
TIME (PDT) 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM 6PM 7PM
TEMP............45 52 62 67 71 72 73 74 73 72 69 64
RH..............57 47 37 30 28 25 23 21 21 22 28 31
20 FT WIND DIR..SE SE SE S S S S S S S S SE
20 FT WIND SPD..4 4 5 7 7 8 8 7 6 5 4 3
20 FT WIND GUST.5 5 6 8 10 11 11 10 8 7 6 5
TONIGHT
SKY/WEATHER.........MOSTLY CLEAR (10-20 PERCENT).
CWR.................0 PERCENT.
MIN TEMPERATURE.....45-48.
MAX HUMIDITY........44-49 PERCENT.
WIND (20 FT)........LIGHT WINDS.
RIDGETOP WIND.......LIGHT WINDS.
MIXING HEIGHT.......2100 FT AGL EARLY IN THE EVENING.
TRANSPORT WINDS.....SOUTHEAST 7 TO 8 MPH.
VENTILATION INDEX...LOW (70) DECREASING TO LOW (30) OVERNIGHT.
SUNDAY
SKY/WEATHER.........SUNNY (20-30 PERCENT).
CWR.................0 PERCENT.
MAX TEMPERATURE.....AROUND 80.
MIN HUMIDITY........14-19 PERCENT.
WIND (20 FT)........LIGHT WINDS BECOMING SOUTH 5 TO 8 MPH LATE IN
THE MORNING, THEN BECOMING LIGHT LATE IN THE
AFTERNOON.
RIDGETOP WIND.......LIGHT WINDS BECOMING SOUTH 7 TO 10 MPH LATE IN
THE MORNING, THEN BECOMING LIGHT LATE IN THE
AFTERNOON.
MIXING HEIGHT.......6000 FT AGL.
TRANSPORT WINDS.....SOUTHEAST AROUND 8 MPH SHIFTING TO THE
SOUTHWEST 9 TO 14 MPH LATE IN THE MORNING.
VENTILATION INDEX...LOW (40) INCREASING TO HIGH (510) IN THE
AFTERNOON.
FORECASTER...RUSSELL
REQUESTED BY...JESSE RIGEL
TYPE OF REQUEST...PRESCRIBED
.TAG 2622922.1/PDT
.DELDT 10/03/26
.FORMATTERVERSION 2.0.0
.EMAIL JESSE.RIGEL@USDA.GOV
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