834 
FNUS76 KPDT 300541
FWSPDT

Spot Forecast for Stafford Creek...USFS
National Weather Service Pendleton OR
1041 PM PDT Fri Aug 29 2025

Forecast is based on forecast start time of 0600 PDT on August 30. 
***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...Winds will be light and terrain/diurnally driven
through Sunday. Afternoon RHs will be in the lower 20s, with
moderate overnight recoveries. Inversions will develop shortly
after sunset, then lifting shortly after 9AM.

.SATURDAY...

Sky/weather.........Sunny (20-30 percent). Haze late in the 
                    afternoon. 
CWR.................0 percent. 
Chance of lightning.4 percent. 
Max temperature.....80-83. 
Min humidity........21-26 percent. 
Wind (20 ft)........Down valley winds around 5 mph becoming up 
					valley after 11AM. 
Ridgetop wind.......West winds around 5 mph shifting to the south
					around 11AM, then shifting to the west 
					4 to 7 mph around 4PM. 
Mixing height.......7600 ft AGL. 
Transport winds.....West around 6 mph shifting to the southwest 8 
                    to 10 mph late in the morning. 
Ventilation Index...Poor (50) increasing to fair (480) in the 
                    afternoon. 

TIME (PDT)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM 
Chc of ltng (%).0   0   0   0   0   0   0   0   0   0   0   0   
Temp............59  58  60  63  68  72  76  77  79  79  79  78  
RH..............55  56  55  50  41  33  30  28  26  25  26  28  
20 FT wind dir..N   N   W   W   W   SW  SW  SW  SW  SW  SW  SW  
20 FT wind spd..3   3   3   3   3   4   4   4   4   4   4   4   
20 FT wind gust.        5   5   5   7   7   7   8   8   8   7   

.SATURDAY NIGHT...

Sky/weather.........Partly cloudy (35-45 percent) then becoming 
                    mostly cloudy (50-60 percent) then becoming 
                    partly cloudy (40-50 percent). Haze. 
CWR.................0 percent. 
Chance of lightning.3 percent. 
Min temperature.....63-66. 
Max humidity........47-52 percent. 
Wind (20 ft)........Up valley winds around 5 mph becoming down
					valley after 8PM. 
Ridgetop wind.......West winds 4 to 7 mph shifting to the north
					after 8PM, then shifting to the east after
					1AM.  
Mixing height.......500 ft AGL. 
Transport winds.....West around 8 mph shifting to the northeast 
                    early in the morning. 
Ventilation Index...Poor (120) decreasing to poor (30) overnight. 

.SUNDAY...

Sky/weather.........Mostly sunny (25-35 percent). Haze early in the 
                    morning. 
CWR.................0 percent. 
Chance of lightning.4 percent. 
Max temperature.....82-85. 
Min humidity........22-27 percent. 
Wind (20 ft)........Downvalley winds around 5 mph becoming east winds
					4 to 7 mph after 10AM, then shifting to the
					southeast after 2PM.
Ridgetop wind.......East winds 4 to 8 mph. 
Mixing height.......8700 ft AGL. 
Transport winds.....Northeast 8 to 14 mph shifting to the southeast 
                    around 14 mph late in the afternoon. 
Ventilation Index...Poor (50) increasing to good (600) in the 
                    afternoon. 

$$
Forecaster...Lawhorn
Requested by...Cle Elum Ranger District
Type of request...WILDFIRE
.TAG 2520975.0/PDT
.DELDT 08/30/25
.FormatterVersion 2.0.0
.EMAIL katelyn.page@usda.gov