481
FNUS76 KPDT 052349
FWSPDT

Spot Forecast for 781...USFS/BLM
National Weather Service Pendleton OR
449 PM PDT Tue Aug 5 2025

Forecast is based on forecast start time of 1700 PDT on August 05.
***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...Back-to-back weather systems will move across the
region tonight through Thursday, ushering in below-normal temperatures
and partly to mostly cloudy skies. Rain chances are very low (10%)
for the burn site, though.

.TONIGHT...

Sky/weather.........Partly cloudy (40-50 percent) then becoming
                    mostly cloudy (65-75 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....53-56.
Max humidity........57-62 percent.
Wind (20 ft)........Northwest winds 8-12 mph shifting to the
                    southeast 4-6 mph around midnight, then
                    shifting to the southwest 6-9 mph around 3-4 am.
Ridgetop wind.......Northwest winds 8-12 mph shifting to the
                    southeast 4-6 mph around midnight, then
                    shifting to the southwest 6-9 mph around 3-4 am.
Mixing height.......Decreasing to 500-700 ft AGL overnight.
Transport winds.....Northwest 8-12 mph in the evening becoming
                    southwest 5-8 mph overnight.
Ventilation Index...Fair (350) decreasing to poor (30) overnight.

.WEDNESDAY...

Sky/weather.........Mostly cloudy (70-80 percent) then becoming
                    mostly sunny (35-45 percent) then becoming
                    mostly cloudy (70-80 percent).
CWR.................0 percent.
Chance of lightning.5 percent.
Max temperature.....77-80.
Min humidity........27-32 percent.
Wind (20 ft)........Southwest winds 5-8 mph with gusts up to 15 mph
                    in the morning, shifting to the northwest
                    6-10 mph with gusts up to 15 mph in the
                    mid-afternoon.
Ridgetop wind.......Southwest winds 5-8 mph with gusts up to 15 mph
                    in the morning, shifting to the northwest
                    6-10 mph with gusts up to 15 mph in the
                    mid-afternoon.
Mixing height.......Increasing to 8000-8500 ft AGL by afternoon.
Transport winds.....West 8-12 mph shifting to the northwest
                    8-12 mph late in the afternoon.
Ventilation Index...Poor (100) increasing to excellent (790) in the
                    afternoon.

$$
Forecaster...Plunkett
Requested by...IC
Type of request...WILDFIRE
.TAG 2519391.0/PDT
.DELDT 08/05/25
.FormatterVersion 2.0.0
.EMAIL suvi.rova@usda.gov