166
FNUS76 KPDT 291528
FWSPDT

Spot Forecast for Smoke Report...USFS
National Weather Service Pendleton OR
828 AM PDT Fri Aug 29 2025

Forecast is based on forecast start time of 0900 PDT on August 29.
***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 dry and warming pattern is expected to take hold
of the region over the next week. Cloud cover will linger today,
before some clearing takes place heading into tomorrow, with
partly cloudy skies expected over the next several days. Winds
will be light and terrain-driven. RH recoveries will steadily
worsen as temperatures warm over the next week.

.TODAY...

Sky/weather.........Mostly cloudy (60-70 percent).
CWR.................0 percent.
Chance of lightning.2 percent.
Max temperature.....79-82.
Min humidity........27-32 percent.
Wind (20 ft)........Downslope winds around 5 mph early in the morning,
                    becoming Upslope around 5 to 8 mph in the afternoon.
Ridgetop wind.......Southeast winds 5 to 10 mph in the morning,
                    becoming Northwest in the afternoon.
Mixing height.......7500 ft AGL.
Transport winds.....Southeast 5 to 8 mph shifting to the Northwest
                    around 8 mph late in the afternoon.
Ventilation Index...Poor (50) increasing to fair (480) in the
                    afternoon.

TIME (PDT)      9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM 6PM 7PM 8PM
Chc of ltng (%).0   0   0   0   0   0   0   0   0   0   0   0
Temp............63  68  72  75  78  79  79  79  79  77  74  70
RH..............62  53  45  40  37  34  34  32  33  38  44  51
20 FT wind dir..SE  SE  W   NW  NW  NW  NW  NW  NW  NW  W   S
20 FT wind spd..2   2   4   4   4   5   5   5   4   4   4   3
20 FT wind gust.5   5   8   8   8   10  10  10  8   8   8

.TONIGHT...

Sky/weather.........Mostly cloudy (70-80 percent) then becoming
                    partly cloudy (30-40 percent).
CWR.................0 percent.
Chance of lightning.1 percent.
Min temperature.....59-62.
Max humidity........54-59 percent.
Wind (20 ft)........Upslope winds 5 to 8 mph early in the evening,
                    becoming Downslope around 5 mph overnight.
Ridgetop wind.......Northwest winds 5 to 10 mph.
Mixing height.......600 ft AGL.
Transport winds.....West 6 to 8 mph.
Ventilation Index...Poor (170) decreasing to poor (30) overnight.

.SATURDAY...

Sky/weather.........Mostly sunny (25-35 percent).
CWR.................0 percent.
Chance of lightning.4 percent.
Max temperature.....81-84.
Min humidity........21-26 percent.
Wind (20 ft)........Downslope winds around 5 mph early in the morning,
                    becoming Upslope around 5 to 8 mph in the afternoon.
Ridgetop wind.......Northwest winds 6 to 12 mph.
Mixing height.......8000 ft AGL.
Transport winds.....West-Southwest 6 to 12 mph.
Ventilation Index...Poor (40) increasing to fair (430) in the
                    afternoon.

$$
Forecaster...Evans
Requested by...Cle Elum Ranger District
Type of request...WILDFIRE
.TAG 2520938.0/PDT
.DELDT 08/29/25
.FormatterVersion 2.0.0
.EMAIL katelyn.page@usda.gov