992
FNUS76 KPDT 012150
FWSPDT

Spot Forecast for Deer 123B...USFS
National Weather Service Pendleton OR
250 PM PDT Wed Oct 1 2025

Forecast is based on ignition time of 1600 MDT on October 02.
***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 cool weather system moving through the region will
bring cooler temperatures and higher RHs to the burn area. A
slight chance of isolated thunderstorms (10-20%) will be possible
tomorrow afternoon as the system passes overhead. Otherwise,
there will be a chance of rain showers (30-45%). Winds will be
light and terrain driven, then increasing from the north Friday.

.THURSDAY...

Sky/weather.........Cloudy (85-95 percent). Chance of rain showers
                    and slight chance of thunderstorms.
CWR.................26 percent.
Chance of lightning.15 percent.
Max temperature.....62-65.
Min humidity........33-38 percent.
Wind (20 ft)........Light downslope winds becoming light upslope
winds around 11AM. Gusty and erratic winds expected
                    near thunderstorms.
Ridgetop wind.......Southwest winds 4 to 7 mph shifting to the south
5 to 8 mph around 11AM.
Mixing height.......6400 ft AGL.
Transport winds.....South around 13 mph.
Ventilation Index...Poor (20) increasing to excellent (704) in the
afternoon.

TIME (MDT)      5 PM   7 PM   9 PM   11 PM  1 AM   3 AM
Chc of ltng (%).20     20     20     20     0      0
Temp............M      M      48     M      M      39
RH..............M      M      67     M      M      100
20 ft wind......SW 4   NW 4   N 3    N 3    N 3    N 3
20 ft wind gust.8      6      4      4      5      5

.THURSDAY NIGHT...

Sky/weather.........Mostly cloudy (80-90 percent). Slight chance of
                    thunderstorms in the evening. Chance of rain
                    showers. Slight chance of rain showers early in
                    the morning. Patchy fog late in the evening.
                    Areas of fog overnight.
CWR.................26 percent decreasing to 15 percent late in the
                    evening.
Chance of lightning.15 percent.
Min temperature.....33-36.
Max humidity........95-100 percent.
Wind (20 ft)........Light downslope winds. Gusty and erratic winds expected
                    near thunderstorms in the evening.
Ridgetop wind.......South winds 5 to 8 mph, shifting to the west then to
the north 4 to 7 mph between 7PM to 9PM.
Mixing height.......600 ft AGL.
Transport winds.....South around 13 mph shifting to the north
                    around 6 mph in the late evening and overnight.
Ventilation Index...Excellent (704) in the early evening, decreasing to
poor (28) overnight.

.FRIDAY...

Sky/weather.........Partly sunny (55-65 percent). Areas of fog
                    early in the morning. Slight chance of rain
                    showers in the morning.
CWR.................10 percent.
Chance of lightning.2 percent.
Max temperature.....Around 60.
Min humidity........38-43 percent.
Wind (20 ft)........Light downslope winds becoming northwest 5 to 8 mph
around 10AM.
Ridgetop wind.......North winds 4 to 10 mph.
Mixing height.......4600 ft AGL.
Transport winds.....North 6 to 12 mph.
Ventilation Index...Poor (28) increasing to fair (464) in the late
morning.

$$
Forecaster...Lawhorn
Requested by...Brett Johnson
Type of request...PRESCRIBED
.TAG 2522807.0/PDT
.DELDT 10/01/25
.FormatterVersion 2.0.0
.EMAIL Brett.johnson@usda.gov,Kira.santulli@usda.gov