828
FNUS76 KPDT 201857
FWSPDT

Spot Forecast for Sun Country...SE WA Type 3 IMT - Team 3
National Weather Service Pendleton OR
1157 AM PDT Wed Aug 20 2025

Forecast is based on forecast start time of 0800 PDT on August 21.
***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 the
   transport wind multiplied by the mixing
   height in 100`s of feet. Index categories
   are a generalized indicator only.***

If you have questions or concerns with this forecast, please
contact our office at (541) 276-8134.

.DISCUSSION...Warming, drying tomorrow through the weekend. Hot
and dry with fair-poor overnight recovery starting Thursday night
with worst recovery expected Friday-Sunday. Terrain-driven winds
early morning Thursday and Thursday night, however, east wind
regime forecast to take hold as an upper-level ridge builds late
Thursday through the weekend overhead. East winds with gusts as
high as 10-15 mph Friday and Saturday afternoon/early evening.

.THURSDAY...

Sky/weather.........Sunny (0-10 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....83-85.
Min humidity........18-22 percent.
Wind (20 ft)........Light drainage winds 2 to 4 mph becoming east 4
                    to 6 mph by mid-late morning.
Ridgetop wind.......Northwest around 5 mph becoming southeast by late
                    morning.
Mixing height.......6400 ft AGL.
Transport winds.....Southeast around 5 mph.
Ventilation Index...Poor (30) increasing to fair (280) in the
                    afternoon.

.THURSDAY NIGHT...

Sky/weather.........Clear (0-10 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....54-57.
Max humidity........41-46 percent.
Wind (20 ft)........East winds around 5 mph in the evening
                    becoming light drainage winds 2 to 4 mph.
Ridgetop wind.......East winds around 2 to 5 mph.
Mixing height.......1000 ft AGL.
Transport winds.....Northeast around 5 mph.
Ventilation Index...Poor (30) increasing to poor (50) overnight.

.FRIDAY...

Sky/weather.........Sunny (0-5 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....Around 90.
Min humidity........15-20 percent.
Wind (20 ft)........East winds 5 to 8 mph.
Ridgetop wind.......East winds 5 to 10 mph.
Mixing height.......6900 ft AGL.
Transport winds.....East around 10 mph.
Ventilation Index...Poor (50) increasing to good (620) in the
                    afternoon.

$$
Forecaster...Townsend
Requested by...Ryan Scharnhorst
Type of request...WILDFIRE
.TAG 2520314.0/PDT
.DELDT 08/20/25
.FormatterVersion 2.0.0
.EMAIL ryan_scharnhorst@pullman-wa.gov