776
FNUS76 KPDT 232317
FWSPDT

Spot Forecast for Triple Butte RX...OR-WSA
National Weather Service Pendleton OR
417 PM PDT Fri Oct 23 2026

Forecast is based on ignition time of 1800 PDT on October 23.
***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...

West winds in the late afternoon around 5 to 7 mph will be higher at around
10 to 12 mph on the ridgetops through sunset. Winds will become terrain
driven overnight under 5 mph and increasing upvalley to around 10 mph
Saturday morning. Minimum relative humidity on Saturday afternoon will
reach around 33 percent. Dry conditions with no risk for dry lightning.
Another weak weather system will bring slight chances for rain or snow
showers on Sunday (20 to 30 percent confidence).


.TONIGHT...

Sky/weather.........Mostly clear (20-30 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....29-32.
Max humidity........82-87 percent.
Wind (20 ft)........West winds 5 to 8 mph shifting to the southeast
                    5 to 7 mph late in the evening.
Ridgetop wind.......West winds 7 to 10 mph shifting to the southeast
                    5 to 7 mph late in the evening.
Mixing height.......800 ft AGL early in the evening.
Transport winds.....West 5 to 9 mph shifting to the southeast 7 to
                    8 mph late in the evening.
Ventilation Index...Low (30).

TIME (PDT)      6 PM   8 PM   10 PM  MIDNGT 2 AM   4 AM
Chc of ltng (%).0      0      0      0      0      0
Temp............35     32     31     32     31     31
RH..............86     96     91     82     79     72
20 ft wind......W 7    W 6    NW 6   SE 6   SE 6   S 6
20 ft wind gust.10     7

.SATURDAY...

Sky/weather.........Mostly sunny (40-50 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....49-52.
Min humidity........30-35 percent.
Wind (20 ft)........Southeast winds 5 to 7 mph in the morning
                    becoming light.
Ridgetop wind.......Southeast winds 6 to 10 mph in the morning
                    becoming light.
Mixing height.......1900 ft AGL late in the morning.
Transport winds.....South 5 to 8 mph.
Ventilation Index...Low (30) increasing to low (70) in the
                    afternoon.

.SATURDAY NIGHT...

Sky/weather.........Mostly cloudy (75-85 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....36-39.
Max humidity........54-59 percent.
Wind (20 ft)........Light winds becoming south 5 to 7 mph early in
                    the evening.
Ridgetop wind.......Light winds becoming south 5 to 7 mph early in
                    the evening.
Mixing height.......500 ft AGL early in the evening then 500 ft AGL
                    late in the evening, then then 500 ft AGL early
                    in the morning.
Transport winds.....South 6 to 8 mph.
Ventilation Index...Low (30).

.SUNDAY...

Sky/weather.........Cloudy (95-100 percent) then becoming partly
                    sunny (60-70 percent). Slight chance of snow
                    showers late in the morning. Chance of rain
                    showers late in the morning.
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....45-48.
Min humidity........53-58 percent.
Wind (20 ft)........Southwest winds 5 to 8 mph decreasing to around
                    5 mph.
Ridgetop wind.......Southwest winds 6 to 10 mph decreasing to around
                    7 mph.
Mixing height.......500 ft AGL early in the morning then 3900 ft
                    AGL late in the morning.
Transport winds.....Southwest 7 to 13 mph.
Ventilation Index...Low (30) increasing to moderate (290) in the
                    afternoon.

$$
Forecaster...Russell
Requested by...Gary Sampson
Type of request...PRESCRIBED
.TAG 2624164.4/PDT
.DELDT 10/23/26
.FormatterVersion 2.0.0
.EMAIL gary.sampson@ctwsbnr.org