101
FNUS76 KPDT 041649
FWSPDT
SPOT FORECAST FOR SUMMIT 18...USFS
NATIONAL WEATHER SERVICE PENDLETON OR
949 AM PDT SUN OCT 4 2026
FORECAST IS BASED ON IGNITION TIME OF 1000 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
SOUTH WINDS WILL BECOME LIGHT OVERNIGHT, THEN
REDEVELOP FROM THE NORTHWEST BY LATE MORNING TOMORROW. AFTERNOON
RH WILL BE IN THE LOWER TEENS TOMORROW, WITH GOOD OVERNIGHT
RECOVERY TONIGHT. LOW LEVEL INVERSION WILL LIFT AFTER 10AM
TOMORROW MORNING, AND IS EXPECTED TO REDEVELOP BEFORE 7PM TOMORROW
EVENING.
TONIGHT
SKY/WEATHER.........PARTLY CLOUDY (45-55 PERCENT) THEN BECOMING
MOSTLY CLOUDY (65-75 PERCENT) THEN BECOMING
PARTLY CLOUDY (35-45 PERCENT).
CWR.................0 PERCENT.
MIN TEMPERATURE.....AROUND 50.
MAX HUMIDITY........66-71 PERCENT.
WIND (20 FT)........SOUTH WINDS 4 TO 7 MPH BECOMING LIGHT DRAINAGE
WINDS AROUND 8PM.
RIDGETOP WIND.......SOUTH WINDS 4 TO 7 MPH BECOMING LIGHT WINDS
AROUND 8PM, THEN BECOMING NORTHWEST 4 TO 7 MPH
AROUND 1AM.
MIXING HEIGHT.......1800 FT AGL EARLY IN THE EVENING THEN 500 FT
AGL OVERNIGHT.
TRANSPORT WINDS.....SOUTHWEST AROUND 8 MPH SHIFTING TO THE
NORTHWEST 5 TO 8 MPH EARLY IN THE EVENING.
VENTILATION INDEX...LOW (50) DECREASING TO LOW (30) OVERNIGHT.
MONDAY
SKY/WEATHER.........SUNNY (15-25 PERCENT).
CWR.................0 PERCENT.
MAX TEMPERATURE.....82-85.
MIN HUMIDITY........12-17 PERCENT.
WIND (20 FT)........LIGHT DRAINAGE WINDS BECOMING NORTHWEST 5 TO
8 MPH LATE AROUND 11AM.
RIDGETOP WIND.......NORTHWEST WINDS 4 TO 7 MPH INCREASING TO
5 TO 11 MPH AROUND 11AM.
MIXING HEIGHT.......6600 FT AGL.
TRANSPORT WINDS.....WEST 7 TO 14 MPH.
VENTILATION INDEX...LOW (40) INCREASING TO HIGH (620) IN THE
AFTERNOON.
FORECASTER...LAWHORN
REQUESTED BY...JESSE RIGEL
TYPE OF REQUEST...PRESCRIBED
.TAG 2623044.0/PDT
.DELDT 10/04/26
.FORMATTERVERSION 2.0.0
.EMAIL JESSE.RIGEL@USDA.GOV
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page