051
FNUS76 KPDT 212235
FWSPDT

Spot Forecast for Bowman Creek Rx...Washington DNR
National Weather Service Pendleton OR
335 PM PDT Mon Sep 21 2026

Forecast is based on ignition time of 1800 PDT on September 21.
***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...

Maximum humidity overnight will reach around 95 percent
as winds remain steady around 10 mph. Warming temperatures
Tuesday will drive RH back down to around 40 percent in the
Afternoon. There is no probability for thunderstorms during
period. Breezy to gusty conditions are expected Tuesday afternoon.


.TONIGHT...

Sky/weather.........Mostly cloudy (45-55 percent) then becoming.
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....Around 50.
Max humidity........93-98 percent.
Wind (20 ft)........West winds 5 to 10 mph.
Ridgetop wind.......West winds 7 to 14 mph.
Mixing height.......500 ft AGL in the evening and overnight.
Transport winds.....West 10 to 13 mph.
Ventilation Index...Low (100) decreasing to low (40) 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............78  74  66  63  61  59  57  55  53  52  49  49
RH..............43  52  61  64  68  71  76  81  84  87  92  93
20 FT wind dir..W   W   W   W   W   W   W   W   W   W   W   W
20 FT wind spd..12  10  8   8   8   10  8   8   8   7   7   8
20 FT wind gust.14  13  11  11  11  12  11  11  10  10  10  10

.TUESDAY...

Sky/weather.........Mostly sunny (40-50 percent) then becoming
                    mostly sunny (35-45 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....73-76.
Min humidity........37-42 percent.
Wind (20 ft)........West winds 10 to 20 mph.
Ridgetop wind.......West winds 20 to 30 mph.
Mixing height.......3200 ft AGL early in the morning.
Transport winds.....West 10 to 16 mph increasing to 18 to 20 mph
                    late in the afternoon.
Ventilation Index...Low (80) increasing to moderate (460) in the
                    afternoon.

.TUESDAY NIGHT...

Sky/weather.........Mostly clear (15-25 percent) then becoming
                    mostly cloudy (50-60 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....44-47.
Max humidity........83-88 percent.
Wind (20 ft)........West winds 5 to 15 mph with gusts to around 20
                    mph decreasing to 5 to 7 mph late in the
                    evening.
Ridgetop wind.......West winds 8 to 18 mph with gusts to around 23
                    mph decreasing to 5 to 7 mph late in the
                    evening.
Mixing height.......500 ft AGL in the evening.
Transport winds.....West 12 to 18 mph shifting to the northwest 6
                    to 8 mph late in the evening.
Ventilation Index...Low (180) decreasing to low (30) overnight.

.WEDNESDAY...

Sky/weather.........Mostly sunny (35-45 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....74-77.
Min humidity........28-33 percent.
Wind (20 ft)........West winds 4 to 8 mph increasing to 5 to 9 mph
                    late in the afternoon.
Ridgetop wind.......West winds 6 to 9 mph increasing to 9 to 10 mph
                    late in the afternoon.
Mixing height.......4500 ft AGL late in the morning.
Transport winds.....West 5 to 8 mph increasing to 9 to 10 mph late
                    in the afternoon.
Ventilation Index...Low (30) increasing to moderate (250) in the
                    afternoon.

$$
Forecaster...Russell
Requested by...Adam Lieberg
Type of request...PRESCRIBED
.TAG 2622141.2/PDT
.DELDT 09/21/26
.FormatterVersion 2.0.0
.EMAIL alieberg@columbialandtrust.org