468
FNUS76 KPDT 081237
FWSPDT

Spot Forecast for Cougar Fire...Prineville BLM
National Weather Service Pendleton OR
537 AM PDT Fri Aug 8 2025

Forecast is based on forecast start time of 0630 PDT on August 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...An upper level ridge of high pressure moves over the
fire area bringing sunny skies, dry conditions, and similar high
temperatures after a chilly night. Excellent humidity recoveries
Friday morning, with an inversion breaking around 8 AM. Expect dry
conditions and low winds, but a weak pressure gradient will set
up along the Cascades to elevate winds late in the afternoon.
Moderate overnight humidity recoveries Friday night.

.REST OF TODAY...

Sky/weather.........Sunny (5-15 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....79-82.
Min humidity........7-12 percent.
Wind (20 ft)........Light winds becoming north 5 to 8 mph late in
                    the afternoon.
Ridgetop wind.......
Mixing height.......6300 ft AGL.
Transport winds.....Light winds becoming northwest 5 to 9 mph late
                    in the morning.
Ventilation Index...Poor (30) increasing to fair (230) 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............41  45  51  56  61  65  69  71  74  76  78  79
RH..............81  70  61  50  38  30  24  19  16  14  13  12
20 FT wind dir..N   N   E   E   E   NE  NE  NE  N   N   N   N
20 FT wind spd..2   2   3   3   3   4   4   4   5   5   5   7
20 FT wind gust.        4   4   4   7   7   7   11  11  11  11

.TONIGHT...

Sky/weather.........Partly cloudy (25-35 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....Around 50.
Max humidity........41-46 percent.
Wind (20 ft)........North winds 5 to 8 mph in the evening becoming
                    light.
Ridgetop wind.......
Mixing height.......600 ft AGL.
Transport winds.....North 6 to 12 mph.
Ventilation Index...Fair (290) decreasing to poor (40) overnight.

.SATURDAY...

Sky/weather.........Mostly sunny (30-40 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....84-87.
Min humidity........10-15 percent.
Wind (20 ft)........Light winds becoming north 5 to 10 mph late in
                    the morning.
Ridgetop wind.......
Mixing height.......6800 ft AGL.
Transport winds.....North 5 to 10 mph.
Ventilation Index...Poor (40) increasing to fair (240) in the
                    afternoon.

$$
Forecaster...Callihan/NWS Portland
Requested by...Matthew Noss
Type of request...WILDFIRE
.TAG 2519399.2/PDT
.DELDT 08/08/25
.FormatterVersion 2.0.0
.EMAIL mnoss@blm.gov