364
FNUS76 KPDT 281117
FWSPDT

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

Forecast is based on forecast start time of 0500 PDT on July 28.
***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...Dry and smokey conditions will persist over the
fire through the period. Winds will be from the west 5-8 mph
becoming gusty after 1600 with gusts to 21 mph. Humidity will
be in the mid 40% with excellent overnight recoveries. Wednesday
will see continued west winds 5-7 mph with daytime humidity of
upper 20% to low 30%.

.REST OF TONIGHT...

Sky/weather.........Mostly clear (5-15 percent). Areas of smoke.
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....50-53.
Max humidity........75-80 percent.
Wind (20 ft)........West winds 5 to 8 mph.
Ridgetop wind.......West winds 7 to 10 mph.
Mixing height.......500 ft AGL.
Transport winds.....West around 12 mph.
Ventilation Index...Low (110).

TIME (PDT)      5 AM   7 AM   9 AM   11 AM  1 PM   3 PM
Chc of ltng (%).0      0      0      0      0      0
Temp............50     50     56     62     65     66
RH..............80     78     60     52     49     49
20 ft wind......W 8    W 7    W 7    W 7    W 8    W 8
20 ft wind gust.11     11     12     13     13     14

.TODAY...

Sky/weather.........Sunny (0-10 percent). Areas of smoke in the
                    morning and early afternoon, then smoke late in
                    the afternoon.
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....66-69.
Min humidity........43-48 percent.
Wind (20 ft)........West winds 5 to 11 mph. Gusts up to 21 mph after
                    1600.
Ridgetop wind.......West winds 7 to 13 mph. Gusts up to 26 mph after
                    1600.
Mixing height.......2900 ft AGL.
Transport winds.....West 12 to 16 mph.
Ventilation Index...Low (110) increasing to moderate (360) in the
                    afternoon.

.TONIGHT...

Sky/weather.........Mostly clear (10-20 percent). Smoke early in
                    the evening.
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....46-49.
Max humidity........81-86 percent.
Wind (20 ft)........West winds 5 to 11 mph. Gusts up to 21 mph.
Ridgetop wind.......West winds 8 to 14 mph. Gusts up to 28 mph.
Mixing height.......500 ft AGL.
Transport winds.....West 7 to 16 mph.
Ventilation Index...Low (160) decreasing to low (40) overnight.

.WEDNESDAY...

Sky/weather.........Sunny (10-20 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....71-74.
Min humidity........29-34 percent.
Wind (20 ft)........West winds 5 to 7 mph after 0800 becoming light,
                    then becoming west 5 to 7 mph after 1600.
Ridgetop wind.......West winds 8 to 10 mph after 0800 becoming light,
                    then becoming west 7 to 9 mph after 1600.
Mixing height.......5200 ft AGL.
Transport winds.....West 6 to 12 mph.
Ventilation Index...Low (60) increasing to moderate (340) in the
                    afternoon.

$$
Forecaster...Bennese
Requested by...IC Dave Bihr
Type of request...WILDFIRE
.TAG 2618141.6/PDT
.DELDT 07/28/26
.FormatterVersion 2.0.0
.EMAIL 2026.grasshopper.plans@firenet.gov,shane.d.clifton@usda.gov,david.bihr@usda.gov,waccc@firenet.gov