647 
FNUS76 KPDT 090430
FWSPDT

Spot Forecast for Rocky Flat...FS
National Weather Service Pendleton OR
930 PM PDT Mon Sep 8 2025

Forecast is based on forecast start time of 2200 PDT on September 08. 
***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...A few light showers are currently lingering near the
fire site, though mostly dry conditions are expected overnight. A
few showers are possible Tuesday morning, but chances are better
for showers and thunderstorms Tuesday afternoon into the early
evening. The primary threats from thunderstorms will be gusty
winds, small hail, lightning, and heavy downpours. Cloudy and
moist conditions are keeping humidity high and temperatures
seasonable.

.REST OF TONIGHT...

Sky/weather.........Mostly cloudy (60-70 percent). Slight chance of 
                    rain showers late in the evening.
CWR.................24 percent decreasing to 4 percent late in the 
                    evening. 
Chance of lightning.10 percent. 
Min temperature.....54-57. 
Max humidity........72-77 percent. 
Wind (20 ft)........Northwest winds 5 to 7 mph in the late evening 
                    and overnight becoming light. 
Ridgetop wind.......South around 10 mph. 
Mixing height.......100 ft AGL. 
Transport winds.....Northwest 6 to 13 mph. 
Ventilation Index...Poor (30) overnight. 

TIME (PDT)      10 PM  MIDNGT 2 AM   4 AM   6 AM   8 AM   
Chc of ltng (%).10     10     10     10     10     0      
Temp............59     58     57     55     54     56     
RH..............66     65     69     73     76     73     
20 ft wind......NW 6   NW 6   NW 5   NW 5   W 4    W 5    
20 ft wind gust.10     10     8      8      6      6      

.TUESDAY...

Sky/weather.........Partly sunny (55-65 percent). Slight chance of rain 
                    showers in the morning, then chance of showers
					and thunderstorms in the afternoon.
CWR.................0 percent increasing to 22 percent. 
Chance of lightning.25 percent. 
Max temperature.....70-73. 
Min humidity........38-50 percent. 
Wind (20 ft)........Northwest 5 to 8 mph. 
                    Gusty and erratic winds expected near 
                    thunderstorms. 
Ridgetop wind.......South 10 to 15 mph.
Mixing height.......5000 ft AGL by the afternoon. 
Transport winds.....Northwest 6 to 10 mph. 
Ventilation Index...Poor (40) increasing to fair (260) in the 
                    afternoon. 

.TUESDAY NIGHT...

Sky/weather.........Mostly cloudy (50-70%) Slight chance of 
                    thunderstorms in the evening. Chance of rain 
                    showers through the night. 
CWR.................22 percent decreasing to 2 percent late in the 
                    evening. 
Chance of lightning.19 percent. 
Min temperature.....54-57. 
Max humidity........73-78 percent. 
Wind (20 ft)........North winds 5 to 7 mph early in the evening 
                    becoming light. Gusty and erratic winds 
                    expected near thunderstorms. 
Ridgetop wind.......Southeast 5 to 10 mph. 
Mixing height.......2100 ft AGL becoming 200 ft AGL overnight. 
Transport winds.....Northwest 7 to 9 mph. 
Ventilation Index...Poor (100) decreasing to poor (30) overnight. 

$$
Forecaster...NWS Seattle
Requested by...IC
Type of request...WILDFIRE
.TAG 2521611.0/PDT
.DELDT 09/08/25
.FormatterVersion 2.0.0
.EMAIL orjdcc@firenet.gov,Brian.Pickard@USDA.gov