060 
FNUS76 KPDT 151203
FWSPDT

Spot Forecast for Black Rock...OR-PRD BLM
National Weather Service Pendleton OR
503 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...Clear and dry conditions today and tomorrow. Minimum 
RH values lowering to the 20s each day with moderate overnight 
recoveries into the 50s. Mainly diurnally driven winds, light from 
the south to southeast in the mornings, shifting from the north to 
northeast in the late afternoon and overnight hours, increasing to 
up to 8 to 10 mph.

.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 to southeast winds 4 to 6 mph shifting to   
                    the northeast 5 to 8 mph late in the afternoon. 
Ridgetop wind.......South to southeast winds 5 to 10 mph shifting to   
                    the northeast late in the afternoon.
Mixing height.......4300 ft AGL. 
Transport winds.....Southwest around 5 mph in the morning becoming 
                    light, then 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)........North to northeast winds 5 to 8 mph shifting to  
                    the southeast around 5 mph early in the morning. 
Ridgetop wind.......North to northeast winds 5 to 10 mph shifting to  
                    the southeast 4 to 6 mph early in the morning.
Mixing height.......1100 ft AGL. 
Transport winds.....Northeast 5 to 9 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)........Southeast winds 4 to 7 mph shifting to the 
                    northeast 5 to 11 mph late in the afternoon. 
Ridgetop wind.......Southeast winds 5 to 8 mph shifting to the 
                    northeast 10 to 15 mph late in the afternoon.
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...NWS Portland
Requested by...ICT4
Type of request...WILDFIRE
.TAG 2521927.1/PDT
.DELDT 09/15/25
.FormatterVersion 2.0.0
.EMAIL jluebbers@blm.gov