109
FNUS76 KPDT 271926
FWSPDT

Spot Forecast for Bird Track 623...USFS
National Weather Service Pendleton OR
1226 PM PDT Sun Sep 27 2026

Forecast is based on ignition time of 1300 PDT on September 27.
***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...Dry air with excellent overnight recoveries tonight
with relative humidity values as high as 80 percent. Will see
dry air return tomorrow with RH values dropping down to 20 percent.
Winds overall will be light and variable in nature with typical
diurnal driven speeds.

.REST OF TODAY...

Sky/weather.........Cloudy (85-95 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....67-72.
Min humidity........24-29 percent.
Wind (20 ft)........Light winds.
Ridgetop wind.......Light winds.
Mixing height.......2800 ft AGL.
Transport winds.....Southeast 5 to 10 mph shifting to the north
                    5 to 10 mph late in the afternoon.
Ventilation Index...Low (110).

TIME (PDT)      1PM 2PM 3PM 4PM 5PM 6PM 7PM 8PM 9PM 10P 11P MID
Chc of ltng (%).0   0   0   0   0   0   0   0   0   0   0   0
Temp............64  63  65  63  63  61  55  52  49  47  45  43
RH..............31  32  32  34  35  40  47  53  59  62  66  71
20 FT wind dir..NE  NE  N   N   N   N   N   N   N   N   W   W
20 FT wind spd..4   4   4   4   4   2   2   2   2   2   3   3
20 FT wind gust.6   6   6   6   6   4

.TONIGHT...

Sky/weather.........Mostly cloudy (70-80 percent). Patchy frost
                    overnight.
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....34-37.
Max humidity........75-80 percent.
Wind (20 ft)........Light winds.
Ridgetop wind.......Light winds.
Mixing height.......1000 ft AGL early in the evening.
Transport winds.....Northwest 5 to 10 mph shifting to the west 5 to
                    10 mph late in the evening.
Ventilation Index...Low (40).

.MONDAY...

Sky/weather.........Sunny (5-15 percent). Widespread frost early in
                    the morning.
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....67-72.
Min humidity........20-25 percent.
Wind (20 ft)........Light winds becoming northwest 3 to 8 mph by
                    1 PM.
Ridgetop wind.......Light winds becoming northwest 5 to 10 mph by
                    1 PM.
Mixing height.......4300 ft AGL early in the morning.
Transport winds.....West 5 to 9 mph.
Ventilation Index...Low (40) increasing to moderate (280) in the
                    afternoon.

$$
Forecaster...Day
Requested by...Trevor Durr
Type of request...PRESCRIBED
.TAG 2622616.0/PDT
.DELDT 09/27/26
.FormatterVersion 2.0.0
.EMAIL Trevor.durr@usda.gov,scott.gallagher@usda.gov