643
FNUS76 KPDT 041133
FWSPDT
SPOT FORECAST FOR GRASSHOPPER FIRE...WESTERN WASHINGTON TEAM 3
NATIONAL WEATHER SERVICE PENDLETON OR
433 AM PDT SUN OCT 4 2026
FORECAST IS BASED ON FORECAST START TIME OF 0701 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 SOUTH WINDS UNDER 4 MPH WILL BE THE PREVAILING
CONDITIONS UNTIL AROUND 1600 WHEN WINDS TURN EASTERLY
AT 4 TO 7 MPH THOUGH ABOUT 2000. NO RISK FOR DRY THUNDER.
MINIMUM RELATIVE HUMIDITY AROUND 28 PERCENT WILL RECOVER
OVERNIGHT TO NEAR 60 PERCENT.
TODAY
SKY/WEATHER.........SUNNY (5-15 PERCENT).
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MAX TEMPERATURE.....81-84.
MIN HUMIDITY........26-31 PERCENT.
WIND (20 FT)........LIGHT WINDS.
RIDGETOP WIND.......LIGHT WINDS.
MIXING HEIGHT.......2300 FT AGL EARLY IN THE MORNING.
TRANSPORT WINDS.....LIGHT WINDS BECOMING SOUTH AROUND 6 MPH LATE IN
THE MORNING, THEN SHIFTING TO THE WEST AROUND 5
MPH LATE IN THE AFTERNOON SHIFTING TO THE NORTH
AROUND 6 MPH LATE IN THE AFTERNOON.
VENTILATION INDEX...LOW (30) INCREASING TO LOW (50-90) IN THE
AFTERNOON.
TIME (PDT) 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM 6PM
CHC OF LTNG (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............53 53 59 66 71 74 78 80 80 81 80 77
RH..............65 66 57 47 40 36 33 31 29 28 31 36
20 FT WIND DIR..SW S S S SE SE E E NE NE NE NE
20 FT WIND SPD..3 3 3 3 4 4 3 3 3 3 3 2
20 FT WIND GUST.5 6 6 6 6 6 6 6 6 6 6 5
TONIGHT
SKY/WEATHER.........PARTLY CLOUDY (30-40 PERCENT).
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MIN TEMPERATURE.....51-55.
MAX HUMIDITY........50-64 PERCENT.
WIND (20 FT)........LIGHT WINDS.
RIDGETOP WIND.......LIGHT WINDS.
MIXING HEIGHT.......900 FT AGL EARLY IN THE EVENING THEN 500 FT AGL
LATE IN THE EVENING.
TRANSPORT WINDS.....NORTH AROUND 6 MPH SHIFTING TO THE WEST 5 TO 6
MPH EARLY IN THE EVENING.
VENTILATION INDEX...LOW (30).
MONDAY
SKY/WEATHER.........SUNNY (20-30 PERCENT).
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MAX TEMPERATURE.....84-87.
MIN HUMIDITY........16-21 PERCENT.
WIND (20 FT)........LIGHT WINDS BECOMING NORTHWEST UP TO 5 MPH LATE
IN THE AFTERNOON.
RIDGETOP WIND.......LIGHT WINDS BECOMING NORTHWEST UP TO 5 MPH LATE
IN THE AFTERNOON.
MIXING HEIGHT.......3900 FT AGL EARLY IN THE MORNING.
TRANSPORT WINDS.....WEST 5 TO 9 MPH.
VENTILATION INDEX...LOW (30) INCREASING TO LOW TO MODERATE
(160-220) IN THE AFTERNOON.
FORECASTER...RUSSELL
REQUESTED BY...MATT KINNEE
TYPE OF REQUEST...WILDFIRE
.TAG 2622926.2/PDT
.DELDT 10/04/26
.FORMATTERVERSION 2.0.0
.EMAIL 2026.GRASSHOPPER.SITUATION@FIRENET.GOV,MATT_KINNEE@FIRENET.GOV
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page