045
FNUS76 KPDT 091903
FWSPDT

Spot Forecast for Grasshopper Fire...Western Washington Team 3
National Weather Service Pendleton OR
1203 PM PDT Fri Oct 9 2026

Forecast is based on forecast start time of 0700 PDT on October 10.
***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...A cold front passes through the fire area
today, bringing windy conditions through the afternoon and early
evening. Winds will shift from the west to the northeast later
this evening, becoming more from the west Saturday morning. A 10
degree drop in high temperatures expected on Saturday with morning
low temperatures Sunday in the mid-30s. Breezy winds out of the
north on Sunday, peaking around noon and slowly tapering off
through the afternoon and evening.

.REST OF TODAY...

TIME (PDT)      12P 1PM 2PM 3PM 4PM 5PM 6PM 7PM 8PM 9PM 10P 11P
Chc of ltng (%).0   0   0   0   0   0   0   0   0   0   0   0
Temp............66  65  65  62  61  59  55  51  48  46  45  44
RH..............53  55  58  59  59  59  55  52  52  54  56  57
20 FT wind dir..W   W   W   NW  NW  NW  NW  NW  N   N   NE  NE
20 FT wind spd..12  15  16  15  16  11  10  9   9   10  10  9
20 FT wind gust.20  22  24  24  22  19  20  20  19  21  19  17

.SATURDAY...

Sky/weather.........Mostly sunny (25-35 percent). Areas of frost
                    before 0800.
CWR.................0 percent.
Chance of lightning.3 percent.
Max temperature.....56-59.
Min humidity........39-44 percent.
Wind (20 ft)........West-southwest winds 4 to 8 mph, shifting to
                    the northwest after 1100, then being more
                    out of the north after 1600.
Ridgetop wind.......West-southwest winds 5 to 10 mph, shifting to
                    the northwest after 1100, then being more out
                    of the north after 1600.
Mixing height.......4400 ft AGL early in the morning.
Transport winds.....Northwest 6 to 8 mph shifting to the north 7 to
                    8 mph late in the afternoon.
Ventilation Index...Low (40-80) increasing to moderate (250-360) 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............37  38  42  48  51  53  55  55  56  56  55  53
RH..............83  89  77  64  54  49  45  43  41  41  43  43
20 FT wind dir..SW  W   SW  W   NW  NW  N   NW  NW  N   N   N
20 FT wind spd..5   5   5   5   5   6   6   6   6   6   7   4
20 FT wind gust.7   7   7   8   10  10  11  11  12  11  13  10

.SATURDAY NIGHT...

Sky/weather.........Partly cloudy (30-45 percent) then becoming
                    mostly cloudy (50-65 percent) after 1300.
                    Patchy frost before 1000.
CWR.................0 percent.
Chance of lightning.1 percent.
Min temperature.....35-38.
Max humidity........78-95 percent.
Wind (20 ft)........North-northwest winds 4 to 8 mph.
Ridgetop wind.......North-northwest winds 5 to 10 mph.
Mixing height.......2000 ft AGL early in the evening then 500 ft
                    AGL late in the evening.
Transport winds.....North 8 to 9 mph.
Ventilation Index...Low (90-100) decreasing to low (50-70)
                    overnight.

.SUNDAY...

Sky/weather.........Mostly sunny (40-50 percent). Patchy frost in
                    the morning.
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....56-59.
Min humidity........31-36 percent.
Wind (20 ft)........North winds 4 to 8 mph becoming northeast 8
                    to 14 mph with gusts to around 20 mph after
                    1000. Winds peak between 1100 and 1400.
Ridgetop wind.......North winds 5 to 10 mph becoming northeast
                    10 to 16 mph with gusts to around 24 mph
                    after 1000. Winds peak between 1100 and 1400.
Mixing height.......5400 ft AGL.
Transport winds.....Northeast 9 to 18 mph.
Ventilation Index...Low (90-140) increasing to very high (730-810)
                    in the afternoon.

.FORECAST DAYS 3 THROUGH 5...
.COLUMBUS DAY...
Mostly clear. Patchy frost in the morning. Lows in the mid 30s.
Highs around 60. Light winds.
.TUESDAY...
Mostly clear. Lows in the mid 30s. Highs in the mid 60s. Light
winds.
.WEDNESDAY...
Partly cloudy. Lows in the lower 40s. Highs in the upper 60s.
Light winds.

$$
Forecaster...Callihan
Requested by...Matt Kinnee
Type of request...WILDFIRE
.TAG 2622926.8/PDT
.DELDT 10/09/26
.FormatterVersion 2.0.0
.EMAIL 2026.grasshopper.situation@Firenet.gov,matt_kinnee@firenet.gov