351 
FNUS76 KPDT 060709
FWSPDT

Spot Forecast for Cougar Fire...Prineville BLM
National Weather Service Pendleton OR
1209 AM PDT Wed Aug 6 2025

Forecast is based on forecast start time of 0600 PDT on August 06. 
***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 weak inversion will set up tonight, breaking
around 0800. A surface cold front will pass the fire area 
Wednesday evening around 1800, elevating winds and shifting from 
the west to the northwest. As a result, excellent overnight 
humidity recoveries are expected Thursday morning. Winds will 
subside overnight but will increase mid-morning on Thursday 
before peaking through the afternoon as pressure gradients 
tighten across the Cascades. 

.WEDNESDAY...

Sky/weather.........Mostly cloudy (70-80 percent) then becoming 
                    partly cloudy (50-60 percent) after 2 PM. 
CWR.................0 percent. 
Chance of lightning.4 percent. 
Max temperature.....Around 80. 
Min humidity........21-26 percent. 
Wind (20 ft)........Light winds becoming west 5 to 10 mph after 11
                    AM then becoming northwest 6 to 12 mph with
                    gusts up to 18 mph after 3 PM. 
Mixing height.......8500 ft AGL. 
Transport winds.....Northwest 6 to 7 mph shifting to the west 12 to 
                    14 mph late in the morning. 
Ventilation Index...Poor (80) increasing to excellent (760) 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............51  54  59  63  66  69  71  73  75  76  76  77  
RH..............60  55  49  45  40  35  32  29  27  25  26  25  
20 FT wind dir..W   W   W   W   W   W   W   W   W   NW  NW  NW  
20 FT wind spd..3   3   3   4   5   6   7   7   8   8   10  11  
20 FT wind gust.                    12  13  13  15  15  16  17  

.WEDNESDAY NIGHT...

Sky/weather.........Partly cloudy (40-50 percent). 
CWR.................0 percent. 
Chance of lightning.4 percent. 
Min temperature.....Around 50. 
Max humidity........87-92 percent. 
Wind (20 ft)........Northwest winds 6 to 12 mph with gusts up to 
                    20 mph becoming light after midnight. Winds
                    peak between 6 PM and 9 PM.
Mixing height.......800 ft AGL. 
Transport winds.....Northwest 7 to 16 mph. 
Ventilation Index...Good (510) decreasing to poor (70) overnight. 

.THURSDAY...

Sky/weather.........Partly cloudy (50-65 percent) becoming mostly
                    sunny (25-35 percent) after 11 AM. 
CWR.................0 percent. 
Chance of lightning.0 percent. 
Max temperature.....76-79. 
Min humidity........15-20 percent. 
Wind (20 ft)........Light winds becoming northwest 10 to 15 mph
                    with gusts up to 23 mph after 11 AM, peaking
                    between 2 PM and 7 PM. 
Mixing height.......6900 ft AGL. 
Transport winds.....West 6 to 12 mph increasing to around 21 mph 
                    late in the afternoon. 
Ventilation Index...Poor (80) increasing to excellent (780) in the 
                    afternoon. 

$$
Forecaster...Callihan
Requested by...Matthew Noss
Type of request...WILDFIRE
.TAG 2519399.0/PDT
.DELDT 08/06/25
.FormatterVersion 2.0.0
.EMAIL mnoss@blm.gov