096 
FNUS76 KPDT 191903
FWSPDT

Spot Forecast for Sun Country...SE WA Type 3 IMT - Team 3
National Weather Service Pendleton OR
Issued by National Weather Service Spokane WA
1203 PM PDT Tue Aug 19 2025

Forecast is based on forecast start time of 0700 PDT on August 20. 
***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 Thursday. Breezy west to 
northwest winds will develop late Wednesday morning through 
Wednesday afternoon with gusts to 25 mph. Winds will subside 
late Wednesday night into Thursday. Minimum humidity values will 
start out in the 30 to 40 percent range on Wednesday and will 
trend drier, dropping into the 15 to 20 percent range Thursday and
Friday. Overnight recoveries will be moderate Wednesday night 
becoming poor Thursday night.

.WEDNESDAY...

Sky/weather.........Partly sunny (55-65 percent cloud cover) in 
                    the early morning becoming sunny (0-20 percent 
                    cloud cover) after 0900 PDT. 
CWR.................0 percent. 
Chance of lightning.0 percent. 
Max temperature.....76. 
Min humidity........35 percent. 
Wind (20 ft)........West winds 10 to 15 mph. Gusts up to 25 mph late 
                    in the morning through the evening. 
Ridgetop wind.......Northwest wind 15 to 20 mph. Gusts to 30 mph.
Mixing height.......Inversion breaking around 0900 PDT. Rising to
                    5000 ft AGL in the afternoon. 
Transport winds.....West 14 to 18 mph. 
Ventilation Index...Fair (320) increasing to good (620) 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............56  59  63  66  69  71  73  74  75  76  75  73  
RH..............80  74  63  55  50  45  41  38  36  35  36  40  
20 FT wind dir..W   W   W   WNW WNW WNW WNW WNW WNW WNW WNW WNW 
20 FT wind spd..6   7   7   9   10  11  13  14  15  15  14  14  
20 FT wind gust.11  12  12  14  16  18  23  24  25  25  24  24  

.WEDNESDAY NIGHT...

Sky/weather.........Clear (0-10 percent cloud cover). 
CWR.................0 percent. 
Chance of lightning.0 percent. 
Min temperature.....52. 
Max humidity........63 percent. 
Wind (20 ft)........West northwest winds 12 to 15 mph in the 
                    evening decreasing to 5 to 8 mph overnight. 
Ridgetop wind.......West northwest 15 to 18 mph in the evening 
                    becoming northwest 8 to 11 mph overnight. 
Mixing height.......Inversion setting in by 2100 PDT. Falling to
                    700 ft AGL overnight. 
Transport winds.....West 17 to 21 mph shifting to the northwest 
                    around 10 mph early in the morning. 
Ventilation Index...Fair (460) decreasing to poor (160) overnight. 

.THURSDAY...

Sky/weather.........Sunny (0-10 percent cloud cover). 
CWR.................0 percent. 
Chance of lightning.0 percent. 
Max temperature.....85. 
Min humidity........19 percent. 
Wind (20 ft)........Light winds becoming east 5 to 7 mph late in 
                    the morning. 
Ridgetop wind.......Northwest 4 to 6 mph becoming southeast 5 to 7
                    mph late in the morning. 
Mixing height.......Increasing to 4500 ft AGL in the afternoon. 
Transport winds.....Northwest 5 to 7 mph shifting to the southeast 
                    late in the morning. 
Ventilation Index...Poor (90) increasing to fair (290) in the 
                    afternoon. 

$$
Forecaster...NWS Spokane
Requested by...Ryan Scharnhorst
Type of request...WILDFIRE
.TAG 2520241.0/PDT
.DELDT 08/19/25
.FormatterVersion 2.0.0
.EMAIL ryan_scharnhorst@firenet.gov