FNUS76 KPDT 190058

FWSPDT



Spot Forecast for Sun Country...USFS

National Weather Service Pendleton OR

558 PM PDT Mon Aug 18 2025



Forecast is based on forecast start time of 1800 PDT on August 18. 

***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. 

West winds will be relatively light night but are expected to 

increase on Tuesday and continue through Wednesday, with gusts to

around 20 mph.



MIN RH values will be around 30 to 35 percent on Tuesday, and slightly

higher 35 to 40 percent on Wednesday with excellent overnight recoveries.





.TONIGHT...



Sky/weather.........Partly cloudy (30-40 percent) then becoming 

                    mostly cloudy (50-60 percent). 

CWR.................0 percent. 

Chance of lightning.1 percent. 

Min temperature.....52-55. 

Max humidity........77-82 percent. 

Wind (20 ft)........West winds 5 to 8 mph in the evening and 

                    overnight becoming light. 

Ridgetop wind.......Northwest winds 10 to 15 mph early then around 10 mph.  

Mixing height.......1600 ft AGL. 

Transport winds.....West 10 to 14 mph. 

Ventilation Index...Fair (340) decreasing to poor (150) overnight. 



TIME (PDT)      6 PM   8 PM   10 PM  MIDNGT 2 AM   4 AM   

Chc of ltng (%).0      0      0      0      0      0      

Temp............74     67     63     60     55     54     

RH..............41     52     64     69     79     80     

20 ft wind......W 7    W 6    W 6    W 5    W 4    W 4    

20 ft wind gust.14     12     12     11     10     10     



.TUESDAY...



Sky/weather.........Partly sunny (45-55 percent) then becoming 

                    sunny (20-30 percent). 

CWR.................0 percent. 

Chance of lightning.2 percent. 

Max temperature.....Around 80. 

Min humidity........31-36 percent. 

Wind (20 ft)........Light winds becoming west 5 to 10 mph in the afternoon

                    with gusts to around 20 mph. 

Ridgetop wind.......Northwest wind 10 to 15 mph. 

Mixing height.......5500 ft AGL. 

Transport winds.....West 10 to 17 mph. 

Ventilation Index...Poor (190) increasing to fair (460) in the 

                    afternoon. 



.TUESDAY NIGHT...



Sky/weather.........Partly cloudy (30-40 percent). 

CWR.................0 percent. 

Chance of lightning.1 percent. 

Min temperature.....54-57. 

Max humidity........74-79 percent. 

Wind (20 ft)........West winds 5 to 10 mph. Gusts up to 20 mph. 

Ridgetop wind.......Northwest wind 15 to 20 mph. 

Mixing height.......1600 ft AGL. 

Transport winds.....West 13 to 17 mph. 

Ventilation Index...Fair (450) decreasing to poor (200) overnight. 



.WEDNESDAY...



Sky/weather.........Sunny (15-25 percent). 

CWR.................0 percent. 

Chance of lightning.0 percent. 

Max temperature.....76-79. 

Min humidity........34-39 percent. 

Wind (20 ft)........West winds 5 to 10 mph. Gusts up to 20. 

Ridgetop wind.......Northwest wind 10 to 15 mph with gusts to 20 mph. 

Mixing height.......5300 ft AGL. 

Transport winds.....West 13 to 18 mph. 

Ventilation Index...Fair (220) increasing to good (650) in the 

                    afternoon. 



$$

Forecaster...Nierenberg

Requested by...CWICC

Type of request...WILDFIRE

.TAG 2520181.0/PDT

.DELDT 08/18/25

.FormatterVersion 2.0.0

.EMAIL wacwc@firenet.gov