574
FNUS76 KPDT 041640
FWSPDT

Spot Forecast for Minus 5 Rx Piles...Washington Department of Natural Resources
National Weather Service Pendleton OR
840 AM PST Thu Dec 4 2025

Forecast is based on forecast start time of 0700 PST on December 08.
***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 wet system will bring in increased chances of
rain with CWRs in the mid 20% increasing to 64% overnight an
into Tuesday morning. (50-80% probabilities). Rain amounts will
be between 0.10-0.50 with 65-85% probabilities. RHs will be
excellent through the period above 80% with west and southwest
winds between 5-12 mph and gusts to near 20 mph possible Monday
increasing to 8-17 mph with gusts to near 35 mph possible.

.MONDAY...

Sky/weather.........Mostly cloudy (80-90 percent). Chance of rain
                    early in the morning, then rain likely in the
                    late morning and afternoon.
CWR.................23 percent increasing to 52 percent.
Chance of lightning.3 percent.
Max temperature.....46-49.
Min humidity........88-93 percent.
Wind (20 ft)........Southwest winds 5 to 12 mph. Gusts up to 20 mph
                    late in the afternoon.
Mixing height.......100ft AGL in the morning.
Transport winds.....Southwest 7 to 8 mph.
Ventilation Index...Poor (30).

TIME (PST)      7 AM   9 AM   11 AM  1 PM   3 PM   5 PM
Chc of ltng (%).0      0      0      0      0      0
Temp............42     42     43     45     45     45
RH..............92     97     100    100    99     98
20 ft wind......W 12   W 12   SW 10  SW 8   SW 8   W 8
20 ft wind gust.17     17     14     14     14     16

.MONDAY NIGHT...

Sky/weather.........Mostly cloudy (80-90 percent). Rain likely
                    early in the evening, then rain in the late
                    evening and overnight.
CWR.................59 percent increasing to 64 percent after 3 am.
Chance of lightning.3 percent.
Min temperature.....43-46.
Max humidity........95-100 percent.
Wind (20 ft)........West winds 8 to 17 mph with gusts to around 33
                    mph.
Mixing height.......100ft AGL in the afternoon.
Transport winds.....West 8 to 14 mph increasing to 20 to 23 mph in
                    the late evening and overnight.
Ventilation Index...Poor (30).

.TUESDAY...

Sky/weather.........Mostly cloudy (75-85 percent). Rain.
CWR.................64 percent.
Chance of lightning.3 percent.
Max temperature.....Around 50.
Min humidity........91-96 percent.
Wind (20 ft)........West winds 9 to 21 mph. Gusts up to 41 mph
                    decreasing to 30 morning.mph in the late morning and
                    afternoon.
Mixing height.......700 ft AGL late in the morning.
Transport winds.....West 15 to 23 mph decreasing to 12 to 13 mph in
                    the afternoon.
Ventilation Index...Poor (30-50).

$$
Forecaster...Bennese
Requested by...Adam Chatman
Type of request...WILDFIRE
.TAG 2527033.0/PDT
.DELDT 12/04/25
.FormatterVersion 2.0.0
.EMAIL adam.chatman@dnr.wa.gov