365
FNUS76 KPDT 190314
FWSPDT

Spot Forecast for Bench 81926...ORWST
National Weather Service Pendleton OR
814 PM PDT Tue Aug 18 2026

Forecast is based on forecast start time of 0000 PDT on August 19.
***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.

...RED FLAG WARNING IN EFFECT UNTIL 10 PM PDT THIS EVENING...

.DISCUSSION...Dry conditions will persist through the forecast
period. Winds will be W at 5-7 mph becoming light and variable
overnight. Overnight recoveries will be in the low 40%. Winds
Wednesday will start light becoming W 5-7 after 1600 the light
and variable overnight. Daytime humidity will be in the mid
teens with overnight recoveries in the upper 30%. Thursday
will see light and variable winds through 1600 before becoming
NW 5-7 with humidity in the upper teens to low 20%.

.REST OF TONIGHT...

Sky/weather.........Mostly clear (15-25 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....52-56.
Max humidity........42-56 percent.
Wind (20 ft)........West winds 5 to 7 mph overnight becoming light.
Ridgetop wind.......West winds 7 to 9 mph overnight becoming variable
                    3 to 5 mph.
Mixing height.......500 ft AGL overnight.
Transport winds.....West 6 to 8 mph.
Ventilation Index...Low (30).

TIME (PDT)      MIDNGT 2 AM   4 AM   6 AM   8 AM   10 AM
Chc of ltng (%).0      0      0      0      0      0
Temp............60     58     56     55     59     71
RH..............47     49     47     45     40     29
20 ft wind......W 5    SW 5   W 4    W 4    W 4    SE 3
20 ft wind gust.6      6      6      5      6      4

.WEDNESDAY...

Sky/weather.........Sunny (15-25 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....78-91.
Min humidity........15-21 percent.
Wind (20 ft)........Light winds becoming west 5 to 7 mph after
                    1600.
Ridgetop wind.......Variable winds 3 to 5 mph becoming west 7 to
                    9 mph after 1600
Mixing height.......7000 ft AGL early in the morning.
Transport winds.....Southwest 5 to 10 mph.
Ventilation Index...Low (30) increasing to moderate (390-430) in
                    the afternoon.

.WEDNESDAY NIGHT...

Sky/weather.........Mostly clear (20-30 percent). Patchy smoke
                    early in the evening.
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....55-60.
Max humidity........38-49 percent.
Wind (20 ft)........West winds 5 to 7 mph early in the evening
                    becoming light.
Ridgetop wind.......West winds 7 to 9 mph early in the evening
                    becoming variable 3 to 5 mph overnight.
Mixing height.......3700 ft AGL early in the evening then 500 ft
                    AGL overnight.
Transport winds.....West 6 to 9 mph.
Ventilation Index...Low (180-200) decreasing to low (30) overnight.

.THURSDAY...

Sky/weather.........Sunny (10-20 percent). Patchy smoke early in
                    the morning.
CWR.................0 percent.
Chance of lightning.1 percent.
Max temperature.....80-94.
Min humidity........17-24 percent.
Wind (20 ft)........Light winds becoming northwest 5 to 7 mph after
                    1600.
Ridgetop wind.......Variable winds 3 to 5 mph becoming northwest
                    7 to 9 mph after 1600.
Mixing height.......500 ft AGL early in the morning then 8400 ft
                    AGL late in the morning.
Transport winds.....West 5 to 6 mph shifting to the south 7 to 12
                    mph late in the morning, then shifting to the
                    west around 10 mph late in the afternoon.
Ventilation Index...Low (30) increasing to moderate (430-470) in
                    the afternoon.

$$
Forecaster...Bennese
Requested by...PLANS
Type of request...WILDFIRE
.TAG 2619991.0/PDT
.DELDT 08/18/26
.FormatterVersion 2.0.0
.EMAIL antone.moody@ctwsbnr.org,josh.sohappy@ctwsbnr.org