401
FNUS76 KPDT 052203
FWSPDT

Spot Forecast for Mutton RX...WSA
National Weather Service Pendleton OR
303 PM PDT Tue May 5 2026

Forecast is based on ignition time of 1500 PDT on May 05.
***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...

Winds will be out of the north and becoming more northwest after sunset
as relative humidities recover from the mid 20`s (percent) to around 75
percent overnight. The winds become more down valley and light
(less than 5 mph) after midnight toward the river and then light
southwesterly by Wednesday morning.


.REST OF TODAY...

Sky/weather.........Sunny (0-10 percent).
CWR.................0 percent.
Chance of lightning.1 percent.
Max temperature.....85-88.
Min humidity........21-26 percent.
Wind (20 ft)........North winds 5 to 11 mph.
Ridgetop wind.......North winds 10 to 14 mph.
Mixing height.......8900 ft AGL.
Transport winds.....North 12 to 13 mph.
Ventilation Index...Very high (710).

TIME (PDT)      3 PM   5 PM   7 PM   9 PM   11 PM  1 AM
Chc of ltng (%).0      0      0      0      0      0
Temp............85     85     83     75     66     62
RH..............26     26     30     42     54     65
20 ft wind......N 10   N 11   N 11   N 8    NW 6   NW 6
20 ft wind gust.13     17     17     12

.TONIGHT...

Sky/weather.........Mostly clear (5-15 percent).
CWR.................0 percent.
Chance of lightning.1 percent.
Min temperature.....50-53.
Max humidity........74-79 percent.
Wind (20 ft)........North winds 5 to 11 mph shifting to the
                    northwest 5 to 7 mph late in the evening, then
                    shifting to the south overnight.
Ridgetop wind.......
Mixing height.......1600 ft AGL.
Transport winds.....North 5 to 13 mph in the evening and overnight
                    becoming light, then becoming southwest around
                    5 mph early in the morning.
Ventilation Index...Moderate (410) decreasing to low (40)
                    overnight.

.WEDNESDAY...

Sky/weather.........Sunny (10-20 percent) then becoming partly
                    sunny (60-70 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....Around 90.
Min humidity........20-25 percent.
Wind (20 ft)........South winds 5 to 8 mph shifting to the west 7
                    to 17 mph with gusts to around 22 mph late in
                    the afternoon.
Ridgetop wind.......South winds 7 to 10 mph shifting to the west 9
                    to 20 mph with gusts to around 28 mph late in
                    the afternoon.
Mixing height.......9300 ft AGL.
Transport winds.....Southwest 5 to 6 mph increasing to west around
                    20 mph.
Ventilation Index...Low (100) increasing to very high (780) in the
                    afternoon.

$$
Forecaster...Russell
Requested by...Jeff Casey
Type of request...PRESCRIBED
.TAG 2612844.0/PDT
.DELDT 05/05/26
.FormatterVersion 2.0.0
.EMAIL jeff.casey@ctwsbnr.org,jpndsampson@gmail.com