205 
FNUS76 KPDT 150713
FWSPDT

Spot Forecast for Black Rock...OR-PRD BLM
National Weather Service Pendleton OR
1213 AM PDT Mon Sep 15 2025

Forecast is based on forecast start time of 0600 PDT on September 15. 
***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...The region will enter a dry and quiet pattern this
week as high pressure moves over the Pacific Northwest. Expect
generally clear skies and light winds following the slope of the
terrain. 

.TODAY...

Sky/weather.........Sunny (5-15 percent). 
CWR.................0 percent. 
Chance of lightning.0 percent. 
Max temperature.....73-76. 
Min humidity........23-28 percent. 
Wind (20 ft)........South-Southeast winds 5 to 8 mph, shifting to
                    the Northeast by the afternoon. 
Ridgetop wind.......Southwest winds 5 to 10 mph early, shifting to
                    the Northeast by the afternoon.  
Mixing height.......4300 ft AGL. 
Transport winds.....Southwest around 5 mph in the morning, becoming 
                    Northeast 5 to 8 mph late in the afternoon. 
Ventilation Index...Poor (60) increasing to poor (90) in the 
                    afternoon. 

TIME (PDT)      6 AM   8 AM   10 AM  NOON   2 PM   4 PM   
Chc of ltng (%).0      0      0      0      0      0      
Temp............47     50     58     65     69     73     
RH..............79     72     53     42     31     27     
20 ft wind......S 6    S 5    S 5    SE 5   NE 6   NE 6   
20 ft wind gust.       6      6      6      10     10     

.TONIGHT...

Sky/weather.........Mostly clear (5-15 percent). 
CWR.................0 percent. 
Chance of lightning.0 percent. 
Min temperature.....50-53. 
Max humidity........53-58 percent. 
Wind (20 ft)........West winds around 5 mph. 
Ridgetop wind.......East-Northeast winds 6 to 12 mph.  
Mixing height.......1100 ft AGL. 
Transport winds.....Northeast 5 to 8 mph shifting to the southeast 
                    around 5 mph early in the morning. 
Ventilation Index...Poor (160) decreasing to poor (60) overnight. 

.TUESDAY...

Sky/weather.........Sunny (0-10 percent). 
CWR.................0 percent. 
Chance of lightning.0 percent. 
Max temperature.....82-85. 
Min humidity........22-27 percent. 
Wind (20 ft)........East winds 5 to 8 mph. 
Ridgetop wind.......East-Southeast winds 5 to 10 mph.  
Mixing height.......3900 ft AGL. 
Transport winds.....Southeast 5 to 8 mph shifting to the northeast 
                    late in the afternoon. 
Ventilation Index...Poor (50) increasing to fair (210) in the 
                    afternoon. 

$$
Forecaster...Evans
Requested by...ICT4
Type of request...WILDFIRE
.TAG 2521927.1/PDT
.DELDT 09/15/25
.FormatterVersion 2.0.0
.EMAIL jluebbers@blm.gov