951
FNUS76 KPDT 281555
FWSPDT

Spot Forecast for Bird Track 622...USFS
National Weather Service Pendleton OR
855 AM PDT Mon Sep 28 2026

Forecast is based on ignition time of 0000 PDT on September 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 transport wind
   multiplied by the mixing height in 100`s of ft.
   Categories are a generalized indicator only:
   low (< 200), moderate (200-500), high (500-700),
   and very high (> 700).                           ***

If you have questions or concerns with this forecast, please
contact our office at (541) 276-8134.

.DISCUSSION...Excellent overnight recoveries tonight and Tuesday
night. Relative humidities drop to the 25 to 35 percent range
tomorrow with improvements Wednesday with values up to 45 percent.
Otherwise winds will be generally light and variable in nature
with mostly terrain driven direction overnight.

.REST OF TONIGHT...

Sky/weather.........Partly cloudy (25-35 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....37-42.
Max humidity........70-75 percent.
Wind (20 ft)........Light winds.
Ridgetop wind.......Light winds.
Mixing height.......1500 ft AGL decreasing to 450 ft overnight.
Transport winds.....West 5 to 10 mph.
Ventilation Index...Low (30).

TIME (PDT)      MID 1AM 2AM 3AM 4AM 5AM 6AM 7AM 8AM 9AM 10A 11A
Chc of ltng (%).0   0   0   0   0   0   0   0   0   0   0   0
Temp............44  43  42  40  40  40  38  39  42  48  56  62
RH..............69  69  70  71  71  72  73  72  64  54  46  39
20 FT wind dir..W   W   W   W   W   W   W   W   SW  SW  SW  W
20 FT wind spd..3   3   3   3   3   3   3   3   3   3   4   5
20 FT wind gust.4                               4   4   6   8

.TUESDAY...

Sky/weather.........Mostly sunny (25-35 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....72-77.
Min humidity........29-34 percent.
Wind (20 ft)........Light winds becoming west 5 to 10 mph by 11 AM,
                    then shifting to the northwest 5 to 10 mph by
                    2 PM.
Ridgetop wind.......Light winds becoming west 7 to 12 mph by 11 AM,
                    then shifting to the northwest 7 to 12 mph by
                    2 PM.
Mixing height.......4300 ft AGL early in the morning.
Transport winds.....West 10 to 20 mph.
Ventilation Index...Low (60) increasing to high (570) in the
                    afternoon.

.TUESDAY NIGHT...

Sky/weather.........Partly cloudy (35-45 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....40-45.
Max humidity........95-100 percent.
Wind (20 ft)........Northwest winds 5 to 10 mph becoming light by
                    10 PM.
Ridgetop wind.......Northwest winds 7 to 12 mph becoming light by
                    10 PM.
Mixing height.......500 ft AGL.
Transport winds.....West 10 to 15 mph.
Ventilation Index...Low (140) decreasing to low (40) overnight.

.WEDNESDAY...

Sky/weather.........Mostly cloudy (80-90 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....69-74.
Min humidity........38-43 percent.
Wind (20 ft)........Light winds becoming northwest 5 to 10 mph by
                    11 AM.
Ridgetop wind.......Light winds becoming northwest 7 to 12 mph by
                    11 AM.
Mixing height.......3800 ft AGL.
Transport winds.....Northwest 10 to 15 mph decreasing to around 8
                    mph late in the afternoon.
Ventilation Index...Low (60) increasing to moderate (300) in the
                    afternoon.

$$
Forecaster...Day
Requested by...Trevor Durr
Type of request...PRESCRIBED
.TAG 2622613.1/PDT
.DELDT 09/28/26
.FormatterVersion 2.0.0
.EMAIL trevor.durr@usda.gov