725
FNUS76 KPDT 170542
FWSPDT

Spot Forecast for Three Forks...USFS
National Weather Service Pendleton OR
1042 PM PDT Thu Oct 16 2025

Forecast is based on ignition time of 0600 PDT on October 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 upper-level weather system will move through
the region through early Friday morning, making for low-end chances
for showers at the site, with winds expected to pick up behind
this system heading into the weekend. Winds may gust to around 20
mph at times out of the west during the day Friday, before
decreasing and becoming more easterly by early Saturday morning. A
better chance for area-wide precipitation will arrive around
Saturday afternoon.

.FRIDAY...

Sky/weather.........Mostly cloudy (60-70 percent) then becoming
                    mostly sunny (20-30 percent). Chance of rain showers
                    in the morning (25-35 percent).
CWR.................11 percent decreasing to 0 percent late in the
                    morning.
Chance of lightning.0 percent.
Max temperature.....46-49.
Min humidity........62-67 percent.
Wind (20 ft)........West-Northwest winds 6 to 12 mph with gusts to
                    around 20 mph.
Ridgetop wind.......West-Southwest winds 12 to 20 mph.
Mixing height.......2700 ft AGL.
Transport winds.....West 15 to 22 mph.
Ventilation Index...Fair (230) increasing to good (510) 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............39     40     42     44     44     44
RH..............92     95     89     76     67     70
20 ft wind......W 10   W 11   W 11   W 12   NW 13  NW 13
20 ft wind gust.20     21     21     20     22     22

.FRIDAY NIGHT...

Sky/weather.........Partly cloudy (35-45 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....32-35.
Max humidity........79-84 percent.
Wind (20 ft)........West winds 6 to 12 mph with gusts to
                    around 20 mph early in the evening, becoming
                    South 5 to 8 mph overnight.
Ridgetop wind.......West-Southwest winds 10 to 18 mph, becoming
                    Southeast overnight.
Mixing height.......500 ft AGL.
Transport winds.....Northwest 14 to 20 mph decreasing to around 9
                    mph late in the evening, then shifting to the
                    south around 6 mph by the early morning.
Ventilation Index...Fair (220) decreasing to poor (50) overnight.

.SATURDAY...

Sky/weather.........Partly sunny (60-70 percent). Chance of rain
                    showers late in the morning (30-40 percent),
                    becoming likely by the late afternoon.
CWR.................0 percent increasing to 91 percent late in the
                    afternoon.
Chance of lightning.2 percent.
Max temperature.....50-53.
Min humidity........41-46 percent.
Wind (20 ft)........South-Southeast winds 5 to 8 mph.
Ridgetop wind.......East-Southeast winds 6 to 12 mph.
Mixing height.......1600 ft AGL.
Transport winds.....Southwest 6 to 8 mph.
Ventilation Index...Poor (30) increasing to poor (80) in the
                    afternoon.

$$
Forecaster...Evans
Requested by...JC
Type of request...PRESCRIBED
.TAG 2523794.0/PDT
.DELDT 10/17/25
.FormatterVersion 2.0.0
.EMAIL jonathon.l.campbell@usda.gov