081
FNUS76 KPDT 282104
FWSPDT

Spot Forecast for Grasshoper...WACCC
National Weather Service Pendleton OR
204 PM PDT Tue Jul 28 2026

Forecast is based on forecast start time of 0600 PDT on July 29.
***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 winds up to 10 mph sustained expected,
with gusty winds up to 20 mph developing late Wednesday
afternoon through the evening. Winds remain roughly light
and variable through the morning hours during the daytime.
Otherwise, good to excellent overnight recoveries.

.WEDNESDAY...

Sky/weather.........Sunny (0-10 percent). Areas of smoke.
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....69-74.
Min humidity........34-39 percent.
Wind (20 ft)........West winds 3 to 8 mph becoming light by 9 AM,
                    then becoming west 3 to 8 mph by 2 PM.
Ridgetop wind.......West winds 5 to 10 mph becoming light by 9 AM,
                    then becoming west 5 to 10 mph by 2 PM.
Mixing height.......4400 ft AGL.
Transport winds.....Southwest 5 to 10 mph.
Ventilation Index...Low (50) increasing to moderate (250-260) in
                    the afternoon.

TIME (PDT)      6 AM   8 AM   10 AM  NOON   2 PM   4 PM
Chc of ltng (%).0      0      0      0      0      0
Temp............46     52     61     66     70     71
RH..............83     67     50     42     36     38
20 ft wind......NW 5   W 3    SW 2   SW 3   SW 4   W 5
20 ft wind gust.8      6      6      7      10     10

.WEDNESDAY NIGHT...

Sky/weather.........Mostly clear (10-20 percent). Areas of smoke.
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....45-50.
Max humidity........60-65 percent.
Wind (20 ft)........West winds 5 to 10 mph. Gusts up to 20 mph
                    through 11 PM.
Ridgetop wind.......West winds 7 to 12 mph. Gusts up to 25 mph
                    through 11 PM.
Mixing height.......500 ft AGL.
Transport winds.....West 9 to 14 mph.
Ventilation Index...Low (170-180) decreasing to low (50) overnight.

.THURSDAY...

Sky/weather.........Sunny (15-25 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....68-73.
Min humidity........30-35 percent.
Wind (20 ft)........West winds 5 to 10 mph in the morning becoming
                    light by 9 AM, then becoming west 3 to 8 mph
                    by 2 PM.
Ridgetop wind.......West winds 7 to 12 mph in the morning becoming
                    light by 9 AM, then becoming west 5 to 10 mph
                    by 2 PM.
Mixing height.......4000 ft AGL.
Transport winds.....West 9 to 14 mph.
Ventilation Index...Low (40) increasing to moderate (260-270) in
                    the afternoon.

$$
Forecaster...Day
Requested by...IC Dave Bihr
Type of request...WILDFIRE
.TAG 2618141.7/PDT
.DELDT 07/28/26
.FormatterVersion 2.0.0
.EMAIL waccc@firenet.gov,shane.d.clifton@usda.gov,david.bihr@usda.gov,2026.grasshopper.plans@firenet.gov