601
FNUS76 KPDT 071149
FWSPDT

Spot Forecast for Marshall/Devine...U.S Forest Service
National Weather Service Pendleton OR
449 AM PDT Thu May 7 2026

Forecast is based on ignition time of 0700 PDT on May 07.
***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...Warm, dry conditions with low afternoon RH are
forecast today and Friday. Moderate RH recovery is anticipated
overnight. Winds will be mostly diurnally and terrain-driven,
gusty in the afternoon.

.TODAY...

Sky/weather.........Partly cloudy (15-45 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....70-73.
Min humidity........14-19 percent.
Wind (20 ft)........Northwest winds 4-8 mph with gusts of 10-15 mph
                    in the morning, increasing to 8-12 mph with gusts
                    of 15-20 mph in the afternoon.
Ridgetop wind.......Northwest winds 5-9 mph with gusts of 10-15 mph
                    in the morning, increasing to 10-14 mph with gusts
                    of 15-25 mph in the afternoon.
Mixing height.......Increasing to 5500-6000 ft AGL by late morning.
Transport winds.....Northwest 8-12 mph in the morning, increasing to
                    12-17 mph in the afternoon.
Ventilation Index...Low (130) increasing to very high (960) 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............46  49  56  61  63  65  66  68  70  70  70  71
RH..............61  52  41  33  27  25  23  21  19  17  17  17
20 FT wind dir..NW  NW  NW  NW  NW  NW  NW  NW  NW  NW  NW  NW
20 FT wind spd..4   8   8   9   10  11  12  11  11  11  11  10
20 FT wind gust.        14  14  18  18  18  18  18  18  18  18

.TONIGHT...

Sky/weather.........Mostly clear (15-25 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....40-43.
Max humidity........45-50 percent.
Wind (20 ft)........Northwest winds 7-10 mph with gusts of 15-20 mph
                    early evening, shifting to the north 5-8 mph late
                    evening, then shifting to the northwest to west
                    2-5 mph overnight.
Ridgetop wind.......Northwest winds 8-12 mph with gusts of 15-25 mph
                    early evening, shifting to the north 6-9 mph late
                    evening, then shifting to the northwest to west
                    2-5 mph overnight.
Mixing height.......Decreasing to 300-600 ft AGL overnight.
Transport winds.....Northwest 12-17 mph early evening, shifting to the
                    north 5-8 mph late evening, then becoming west to
                    northwest 5-8 mph overnight.
Ventilation Index...Decreasing to low (30) overnight.

.FRIDAY...

Sky/weather.........Partly to mostly cloudy (35-70 percent) then becoming
                    sunny (0-10 percent) late afternoon.
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....68-71.
Min humidity........14-19 percent.
Wind (20 ft)........West to northwest winds 4-8 mph winds with gusts
                    of 12-17 mph in the morning, increasing to 8-12 mph
                    with gusts of 15-25 mph afternoon.
Ridgetop wind.......West to northwest winds 5-9 mph winds with gusts
                    of 12-17 mph in the morning, increasing to 10-14 mph
                    with gusts of 15-25 mph afternoon.
Mixing height.......Increasing to 7000-7500 ft AGL by late morning.
Transport winds.....West to northwest 8-12 mph in the morning, increasing
                    to 15-20 mph in the afternoon.
Ventilation Index...Low (130) increasing to very high (1050) in the
                    afternoon.

$$
Forecaster...Plunkett
Requested by...Josh Cate
Type of request...PRESCRIBED
.TAG 2612856.1/PDT
.DELDT 05/07/26
.FormatterVersion 2.0.0
.EMAIL kevin.percy@usda.gov,joshua.Cate@usda.gov,jeffrey.hussey@usda.gov,orbic@firenet.gov