589
FNUS76 KPDT 190710
FWSPDT

Spot Forecast for Sun Country...SE WA Type 3 IMT - Team 3
National Weather Service Pendleton OR
1210 AM PDT Tue Aug 19 2025

Forecast is based on forecast start time of 0700 PDT on August 19.
***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...Dry conditions are expected through Wednesday.
Gusty  west to northwest winds will develop on Tuesday, lessen
a bit Tuesday night and redevelop on Wednesday.  Winds should gust
to around 20 mph.

MIN RH values will be generally around 30 to 40 percent with excellent
overnight recoveries.



.TUESDAY...

Sky/weather.........Mostly sunny (35-45 percent).
CWR.................0 percent.
Chance of lightning.1 percent.
Max temperature.....76-79.
Min humidity........33-38 percent.
Wind (20 ft)........West to northwest winds 5 to 10 mph. Gusts up to 20 mph late
                    in the afternoon.
Ridgetop wind.......Northwest winds 10 to 15 mph.  Gusts to 20 mph in the afternoon.
Mixing height.......5200 ft AGL.
Transport winds.....West 9 to 17 mph.
Ventilation Index...Poor (180) increasing to fair (450) 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............53  57  61  64  68  71  73  74  75  74  73  72
RH..............81  71  61  53  45  41  39  38  38  40  41  43
20 FT wind dir..W   W   W   W   W   W   W   W   W   W   W   W
20 FT wind spd..6   6   6   6   7   7   7   8   8   8   8   8
20 FT wind gust.8   10  10  10  13  13  13  16  16  16  16  16

.TUESDAY NIGHT...

Sky/weather.........Partly cloudy (35-45 percent) then becoming
                    mostly cloudy (55-65 percent).
CWR.................0 percent.
Chance of lightning.1 percent.
Min temperature.....53-56.
Max humidity........75-80 percent.
Wind (20 ft)........West to northwest winds 5 to 8 mph. Gusts up to
                    20 mph in the evening.
Ridgetop wind.......Northwest winds 15 to 20 mph.
Mixing height.......1400 ft AGL.
Transport winds.....West 14 to 17 mph.
Ventilation Index...Fair (390) decreasing to poor (170) overnight.

.WEDNESDAY...

Sky/weather.........Partly sunny (55-65 percent) then becoming
                    sunny (5-15 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....74-77.
Min humidity........32-37 percent.
Wind (20 ft)........Northwest winds 5 to 10 mph. Gusts up to 20 mph
                    in the afternoon.
Ridgetop wind.......Northwest wind 10 to 15 mph.  Gusts to 20 mph.
                    Decreasing to 5 to 10 mph with gusts to 15 mph in the
                    evening.
Mixing height.......4700 ft AGL.
Transport winds.....West 14 to 18 mph.
Ventilation Index...Fair (260) increasing to good (540) in the
                    afternoon.

$$
Forecaster...Nierenberg
Requested by...Ryan Scharnhorst
Type of request...WILDFIRE
.TAG 2520198.0/PDT
.DELDT 08/19/25
.FormatterVersion 2.0.0
.EMAIL ryan_scharnhorst@pullman-wa.gov