595
FNUS76 KPDT 202125
FWSPDT

Spot Forecast for Bowman Creek Rx...Washington DNR
National Weather Service Pendleton OR
225 PM PDT Sun Sep 20 2026

Forecast is based on ignition time of 1800 PDT on September 20.
***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...

Light winds out of the east This Evening will become more light
and variable and down valley late Tonight and overnight. Winds will
gradually increase out of the west to around 5 to 15 mph during
the afternoon on Monday. No Thunder risk. Humidity overnight around
60 percent falling to about 33 percent Monday.

.TONIGHT...

Sky/weather.........Mostly clear (0-10 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....54-57.
Max humidity........60-65 percent.
Wind (20 ft)........Southeast winds around 5 mph becoming light
                    early in the evening, then becoming east 5 to 7
                    mph early in the evening shifting to the north
                    late in the evening becoming light.
Ridgetop wind.......Southeast winds around 5 mph becoming light
                    early in the evening, then becoming east 5 to 7
                    mph early in the evening shifting to the north
                    late in the evening becoming light.
Mixing height.......2100 ft AGL early in the evening then 500 ft
                    AGL overnight.
Transport winds.....East 6 to 7 mph shifting to the north 5 to 6
                    mph late in the evening.
Ventilation Index...Low (60) decreasing to low (30) overnight.

TIME (PDT)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Chc of ltng (%).0   0   0   0   0   0   0   0   0   0   0   0
Temp............82  77  70  67  65  63  62  60  59  58  56  56
RH..............29  34  41  46  48  50  53  55  57  58  60  59
20 FT wind dir..SE  SE  E   E   N   N   N   N   N   N   N   NE
20 FT wind spd..5   4   5   5   6   5   4   4   4   4   4   3
20 FT wind gust.6   5   6   6       6   5   5   5   5       4

.MONDAY...

Sky/weather.........Mostly sunny (25-35 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....84-87.
Min humidity........30-35 percent.
Wind (20 ft)........Light winds becoming southwest 5 to 10 mph late
                    in the morning.
Ridgetop wind.......Light winds becoming southwest 10 to 15 mph late
                    in the morning.
Mixing height.......3100 ft AGL.
Transport winds.....North around 5 mph early in the morning
                    becoming light, then becoming west 6 to 14 mph
                    late in the morning.
Ventilation Index...Low (30) increasing to low (190) in the
                    afternoon.

.MONDAY NIGHT...

Sky/weather.........Partly cloudy (35-45 percent) then becoming
                    mostly cloudy (65-75 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....49-52.
Max humidity........88-93 percent.
Wind (20 ft)........West winds 4 to 8 mph.
Ridgetop wind.......West winds up to 10 mph.
Mixing height.......500 ft AGL in the evening and overnight.
Transport winds.....West 7 to 14 mph.
Ventilation Index...Low (80) decreasing to low (30) overnight.

.TUESDAY...

Sky/weather.........Mostly cloudy (80-90 percent) then becoming
                    mostly sunny (25-35 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....73-76.
Min humidity........35-40 percent.
Wind (20 ft)........West winds 5 to 15 mph.
Ridgetop wind.......West winds 10 to 23 mph.
Mixing height.......3200 ft AGL early in the morning.
Transport winds.....West 7 to 16 mph increasing to around 18 mph
                    late in the afternoon.
Ventilation Index...Low (40) increasing to moderate (340) in the
                    afternoon.

$$
Forecaster...Russell
Requested by...Adam Lieberg
Type of request...PRESCRIBED
.TAG 2622141.0/PDT
.DELDT 09/20/26
.FormatterVersion 2.0.0
.EMAIL alieberg@columbialandtrust.org