919
FNUS76 KPDT 171437
FWSPDT

Spot Forecast for Brothers 15...BLM
National Weather Service Pendleton OR
637 AM PST Mon Nov 17 2025

Forecast is based on ignition time of 0700 PST on November 17.
***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 weather system will continue to move through
the region today, providing for slight chances for rain showers,
however any precipitation that occurs is expected to be minimal.
Drier conditions are then expected to prevail Tuesday into
Wednesday, before the next rain chances materialize around early
Thursday morning. Winds will be light, gradually shifting from the
south today to more northwesterly.

.TODAY...

Sky/weather.........Partly sunny (50-60 percent). Slight chance
                    of light rain showers throughout the day
                    (15-20 percent).
CWR.................4 percent.
Max temperature.....51-54.
Min humidity........54-59 percent.
Wind (20 ft)........South winds 5 to 10 mph.
Ridgetop wind.......South-Southwest winds 6 to 12 mph.
Mixing height.......3900 ft AGL.
Transport winds.....South 7 to 13 mph.
Ventilation Index...Poor to fair (80-400) decreasing to poor to
                    fair (40-400) in the afternoon.

TIME (PST)      7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM 6PM
Temp............37  39  43  45  48  49  49  51  50  49  46  42
RH..............94  88  81  73  68  65  60  57  57  60  67  75
20 FT wind dir..S   S   S   S   S   S   S   S   S   S   S   S
20 FT wind spd..8   8   8   10  10  10  8   8   8   6   6   6
20 FT wind gust.12  12  12  14  14  14  13  13  13  10  10  10

.TONIGHT...

Sky/weather.........Mostly cloudy (55-65 percent).
CWR.................0 percent.
Min temperature.....30-33.
Max humidity........92-97 percent.
Wind (20 ft)........Southwest 5 to 10 mph early in the evening,
                    shifting to the Northwest overnight.
Ridgetop wind.......Southwest winds 5 to 10 mph early in the evening,
                    shifting Northwest overnight.
Mixing height.......1000 ft AGL.
Transport winds.....Southwest around 8 mph shifting to the Northwest
                    overnight.
Ventilation Index...Poor (30-40).

.TUESDAY...

Sky/weather.........Partly sunny (55-65 percent).
CWR.................0 percent.
Max temperature.....45-48.
Min humidity........56-61 percent.
Wind (20 ft)........Northwest winds 5 to 8 mph.
Ridgetop wind.......North-Northwest winds 5 to 10 mph.
Mixing height.......1900 ft AGL.
Transport winds.....Northwest 5 to 8 mph.
Ventilation Index...Poor (30-110) increasing to poor (70-110) in
                    the afternoon.

$$
Forecaster...Evans
Requested by...Tavis Fenske
Type of request...PRESCRIBED
.TAG 2526117.0/PDT
.DELDT 11/17/25
.FormatterVersion 2.0.0
.EMAIL tfenske@blm.gov