361
FNUS76 KPDT 091542
FWSPDT

Spot Forecast for Minus 5 Rx Piles...Washington Department of Natural Resources
National Weather Service Pendleton OR
742 AM PST Tue Dec 9 2025

Forecast is based on ignition time of 0804 PST on December 09.
***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...

Light NW winds This Morning will continue to diminish  to light and south to
southeast by mid afternoon. Any breaks in rainfall This morning will
probably redevelop in the afternoon (90%). Strong winds will be redeveloping
for Wednesday.


.REST OF TODAY...

Sky/weather.........Cloudy (90-100 percent). Chance of rain early
                    in the morning, then rain in the late morning
                    and afternoon.
CWR.................65 percent increasing to 98 percent in the late
                    morning and afternoon.
Chance of lightning.2 percent.
Max temperature.....46-49.
Min humidity........92-97 percent.
Wind (20 ft)........West winds 5 to 17 mph with gusts to around 25
                    mph shifting to the south 5 to 8 mph in the
                    afternoon.
Ridgetop wind.......West winds 5 to 17 mph with gusts to around 25
                    mph shifting to the south 5 to 8 mph in the
                    afternoon.
Mixing height.......500-1000 ft AGL
Transport winds.....West 7 to 16 mph shifting to the southeast 6 to
                    7 mph in the afternoon.
Ventilation Index...Poor (30).

TIME (PST)      8 AM   10 AM  NOON   2 PM   4 PM   6 PM
Chc of ltng (%).0      0      0      0      0      0
Temp............41     40     43     44     43     43
RH..............94     99     98     100    100    100
20 ft wind......W 17   W 8    W 8    S 7    S 8    S 8
20 ft wind gust.25     11     11     10     13     13

.TONIGHT...

Sky/weather.........Cloudy (90-100 percent). Rain in the evening,
                    then rain likely overnight. Rain after 3 am.
CWR.................98 percent decreasing to 77 percent in the late
                    evening and overnight.
Chance of lightning.2 percent.
Min temperature.....41-44.
Max humidity........95-100 percent.
Wind (20 ft)........Breezy. South winds 5 to 8 mph increasing to
                    west 8 to 26 mph with gusts to around 38 mph in
                    the evening and overnight, then increasing to
                    18 to 27 mph with gusts to around 38 mph after
                    3 am.
Ridgetop wind.......South winds 5 to 8 mph increasing to
                    west 8 to 26 mph with gusts to around 38 mph in
                    the evening and overnight, then increasing to
                    18 to 27 mph with gusts to around 38 mph after
                    3 am.
Mixing height.......150-250 ft AGL
Transport winds.....East around 7 mph increasing to southwest 13 to
                    21 mph in the evening, then increasing to west
                    26 to 28 mph overnight.
Ventilation Index...Poor (30-50).

.WEDNESDAY...

Sky/weather.........Mostly cloudy (80-90 percent). Rain early in
                    the morning, then rain likely in the morning
                    and early afternoon. Rain late in the
                    afternoon.
CWR.................73 percent decreasing to 35 percent in the late
                    morning and afternoon.
Chance of lightning.0 percent.
Max temperature.....50-53.
Min humidity........88-93 percent.
Wind (20 ft)........Breezy. West winds 12 to 27 mph. Gusts up to 48
                    mph decreasing to 38 mph in the late morning
                    and afternoon.
Ridgetop wind.......Breezy. West winds 12 to 27 mph. Gusts up to 48
                    mph decreasing to 38 mph in the late morning
                    and afternoon.
Mixing height.......900 ft AGL in the late morning and afternoon.
Transport winds.....West 23 to 29 mph.
Ventilation Index...Poor (50-200) increasing to poor (60-200) in
                    the afternoon.

$$
Forecaster...Russell
Requested by...Adam Chatman
Type of request...PRESCRIBED
.TAG 2527033.1/PDT
.DELDT 12/09/25
.FormatterVersion 2.0.0
.EMAIL adam.chatman@dnr.wa.gov