989
FNUS76 KPDT 110243
FWSPDT

Spot Forecast for Forth RTRL RX...BIA
National Weather Service Pendleton OR
743 PM PDT Fri Oct 10 2025

Forecast is based on ignition time of 2000 PDT on October 10.
***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...Showers will develop late this evening and early
tomorrow morning over the burn site, with a slight chance of
light snow showers early in the morning. Another round of showers
will be possible tomorrow and tomorrow night. Best chance of wetting
rains (55-70%) will be between 5pm and 11pm tomorrow. Winds will be
light tonight, but will steadily increase from the west early tomorrow
through the overnight hours. Strongest winds expected after 10PM
Saturday night. Overnight temperatures may approach or reach freezing
both nights.

.REST OF TONIGHT...

Sky/weather.........Mostly cloudy (70-80 percent). Chance of rain
                    showers early in the evening, then rain showers
                    likely and slight chance of snow showers
overnight.
CWR.................8 percent.
Chance of lightning.6 percent.
Min temperature.....36-39.
Max humidity........89-94 percent.
Wind (20 ft)........West winds 5 to 8 mph early in the decreasing to
3 to 6 mph after 11PM.
Ridgetop wind.......West winds 5 to 10 mph.
Mixing height.......800 ft AGL.
Transport winds.....West 12 to 15 mph.
Ventilation Index...Poor (140) increasing to poor (170) overnight.

TIME (PDT)      8 PM   10 PM  MIDNGT 2 AM   4 AM   6 AM
Chc of ltng (%).10     10     0      0      0      10
Temp............45     42     41     40     38     37
RH..............79     88     91     91     93     93
20 ft wind......W 7    W 7    W 4    W 5    W 5    W 5
20 ft wind gust.13     13     7      10     10     10

.SATURDAY...

Sky/weather.........Mostly cloudy (65-75 percent). Rain showers
                    likely and slight chance of snow showers in the
morning, then rain showers in the afternoon.
CWR.................5 percent increasing to 62 percent late in the
                    afternoon.
Chance of lightning.6 percent.
Max temperature.....Around 50.
Min humidity........52-57 percent.
Wind (20 ft)........West winds 3 to 6 mph increasing to 6 to 11 mph
after 11AM.
Ridgetop wind.......West winds 5 to 10 mph increasing to 8 to 13 mph
after 11AM.
Mixing height.......4200 ft AGL.
Transport winds.....West 14 to 18 mph.
Ventilation Index...Fair (210) increasing to good (590) in the
                    afternoon.

.SATURDAY NIGHT...

Sky/weather.........Mostly cloudy (80-90 percent). Rain showers,
                    then rain showers likely and slight chance of
                    snow showers early in the morning.
CWR.................62 percent decreasing to 18 percent.
Chance of lightning.6 percent.
Min temperature.....35-38.
Max humidity........95-100 percent.
Wind (20 ft)........West winds 7 to 12 mph with gusts to around 22
                    mph.
Ridgetop wind.......West winds 8 to 13 mph increasing to 10 to 15
mph with gusts to around 23 mph after 8PM.
Mixing height.......1300 ft AGL.
Transport winds.....West 17 to 23 mph.
Ventilation Index...Fair (280) decreasing to fair (210) overnight.

.SUNDAY...

Sky/weather.........Cloudy (85-95 percent). Slight chance of snow
                    showers. Rain showers likely through the day.
CWR.................18 percent decreasing to 7 percent late in the
                    morning.
Chance of lightning.7 percent.
Max temperature.....42-45.
Min humidity........69-74 percent.
Wind (20 ft)........West winds 5 to 10 mph with gusts up to 20 mph
in the morning shifting to the southwest after
11AM.
Ridgetop wind.......West winds 10 to 15 mph with gusts to around
23 mph shifting to the southwest 6 to 11 mph
after 10AM.
Mixing height.......3200 ft AGL.
Transport winds.....West 18 to 23 mph shifting to the southwest 10
                    to 13 mph late in the afternoon.
Ventilation Index...Fair (370-380).

$$
Forecaster...Lawhorn
Requested by...Joseph Winckler
Type of request...PRESCRIBED
.TAG 2523182.2/PDT
.DELDT 10/10/25
.FormatterVersion 2.0.0
.EMAIL joseph.winckler@bia.gov