503
FNUS76 KPDT 032327
FWSPDT
SPOT FORECAST FOR GRASSHOPPER FIRE...WESTERN WASHINGTON TEAM 3
NATIONAL WEATHER SERVICE PENDLETON OR
427 PM PDT SAT OCT 3 2026
FORECAST IS BASED ON FORECAST START TIME OF 0700 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
AN UPPER-LEVEL RIDGE OF HIGH PRESSURE WILL CONTINUE
THROUGH THE WEEKEND, RESULTING IN LIGHT, TERRAIN-DRIVEN WINDS AND
WARM, DRY CONDITIONS. FAIR TO GOOD RH RECOVERY IS FORECAST OVERNIGHT,
FOLLOWED BY LOW AFTERNOON RH.
SUNDAY
SKY/WEATHER.........MOSTLY SUNNY (10-25 PERCENT), BECOMING PARTLY
CLOUDY (25-55 PERCENT) IN THE AFTERNOON.
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MAX TEMPERATURE.....81-84.
MIN HUMIDITY........25-30 PERCENT.
WIND (20 FT)........TERRAIN-DRIVEN WINDS 1-4 MPH IN THE MORNING,
BECOMING 3-6 MPH IN THE AFTERNOON.
RIDGETOP WIND.......SOUTH TO SOUTHEAST WINDS 2-5 MPH IN THE MORNING,
BECOMING NORTHEAST 4-8 MPH LATE AFTERNOON.
MIXING HEIGHT.......INCREASING TO 2200-2600 FT AGL BY AFTERNOON.
TRANSPORT WINDS.....SOUTH 4-6 MPH SHIFTING TO THE NORTH 4-6
MPH LATE IN THE AFTERNOON.
VENTILATION INDEX...LOW (30) INCREASING TO LOW (60-100) 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 54 59 67 71 75 78 80 81 82 81 77
RH..............65 66 56 47 40 36 33 31 29 29 29 35
20 FT WIND DIR..SW SW S S SE SE SE SE E NE NE NE
20 FT WIND SPD..3 3 3 3 4 4 3 3 3 4 4 3
20 FT WIND GUST.
SUNDAY NIGHT
SKY/WEATHER.........MOSTLY CLOUDY (55-65 PERCENT) THEN BECOMING
MOSTLY CLEAR (20-30 PERCENT).
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MIN TEMPERATURE.....52-57.
MAX HUMIDITY........51-64 PERCENT.
WIND (20 FT)........TERRAIN-DRIVEN WINDS 1-4 MPH.
RIDGETOP WIND.......NORTH TO NORTHEAST WINDS 3-7 MPH IN THE EVENING,
BECOMING WEST TO NORTHWEST 1-4 MPH OVERNIGHT.
MIXING HEIGHT.......DECREASING TO 200-500 FT AGL OVERNIGHT.
TRANSPORT WINDS.....NORTH 4-6 MPH EARLY EVENING, SHIFTING TO THE
WEST 4-6 MPH OVERNIGHT.
VENTILATION INDEX...LOW (30).
MONDAY
SKY/WEATHER.........SUNNY (5-15 PERCENT).
CWR.................0 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MAX TEMPERATURE.....84-87.
MIN HUMIDITY........16-21 PERCENT.
WIND (20 FT)........TERRAIN-DRIVEN WINDS 1-4 MPH.
RIDGETOP WIND.......TERRAIN-DRIVEN WINDS 1-4 MPH.
MIXING HEIGHT.......INCREASING TO 4000-4400 FT AGL BY AFTERNOON.
TRANSPORT WINDS.....WEST TO NORTHWEST 4-8 MPH.
VENTILATION INDEX...LOW (30) INCREASING TO LOW TO MODERATE
(140-200) IN THE AFTERNOON.
FORECASTER...PLUNKETT
REQUESTED BY...MATT KINNEE
TYPE OF REQUEST...WILDFIRE
.TAG 2622926.1/PDT
.DELDT 10/03/26
.FORMATTERVERSION 2.0.0
.EMAIL MATT_KINNEE@FIRENET.GOV,2026.GRASSHOPPER.SITUATION@FIRENET.GOV
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