176
FNUS76 KPDT 140259
FWSPDT

Spot Forecast for Bench Fire...OR-WSA
National Weather Service Pendleton OR
759 PM PDT Thu Aug 13 2026

Forecast is based on forecast start time of 0700 PDT on August 14.
***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 9 PM PDT THIS EVENING...

.DISCUSSION...Chances of rain showers over the next couple of
days, with slight chances of thunderstorm development Saturday
afternoon. Greatest chance of a storm developing is late morning
Saturday through the afternoon. Winds overall will be light with
some gusty erratic winds near/at thunderstorm development.
Overnight recoveries going into Friday night will be good to
excellent ranging from 60 to 70 percent.

.FRIDAY...

Sky/weather.........Sunny (55-65 percent). Areas of smoke.
                    Slight chance of rain showers late in the
                    afternoon.
CWR.................4 percent.
Chance of lightning.10 percent.
Max temperature.....80-85.
Min humidity........25-30 percent.
Wind (20 ft)........Light terrain driven winds in the morning,
                    then becoming northeast at 4 to 9 mph by
                    10 AM. Shifting to the northwest 4 to 9 mph
                    by 2 PM.
Ridgetop wind.......Light winds in the morning, then becoming
                    northeast at 10 to 15 mph by 10 AM. Shifting
                    to the northwest 10 to 15 mph by 2 PM.
Mixing height.......8200 ft AGL early in the morning.
Transport winds.....Northwest 5 to 10 mph shifting to the north
                    early in the morning, then shifting to the
                    southwest 5 to 10 mph late in the morning
                    shifting to the northwest 7 to 12 mph late in
                    the afternoon.
Ventilation Index...Low (40-50) increasing to moderate (310-410) in
                    the afternoon.

TIME (PDT)      7 AM   9 AM   11 AM  1 PM   3 PM   5 PM
Chc of ltng (%).0      0      0      0      10     10
Temp............58     64     73     79     82     83
RH..............70     60     47     36     32     33
20 ft wind......W 4    N 5    NE 7   NE 5   NW 5   NW 7
20 ft wind gust.5      6      10     8      10     12

.FRIDAY NIGHT...

Sky/weather.........Mostly cloudy (70-80 percent). Slight chance of
                    rain showers early in the evening. Patchy smoke
                    in the evening.
CWR.................4 percent.
Chance of lightning.9 percent.
Min temperature.....55-60.
Max humidity........65-70 percent.
Wind (20 ft)........Northwest winds 5 to 10 mph in the evening and
                    overnight becoming light and terrain driven by
                    2 AM.
Ridgetop wind.......Northwest winds 5 to 10 mph in the evening and
                    overnight becoming light by 2 AM.
Mixing height.......700 ft AGL in the evening then 500 ft AGL early
                    in the morning.
Transport winds.....Northwest 5 to 10 mph in the evening and
                    overnight becoming light.
Ventilation Index...Moderate (220-250) decreasing to low (30)
                    overnight.

.SATURDAY...

Sky/weather.........Mostly cloudy (70-80 percent). Slight chance of
                    rain showers late in the morning. Slight chance
                    of thunderstorms late in the afternoon.
CWR.................0 percent.
Chance of lightning.15 percent.
Max temperature.....84-89.
Min humidity........32-37 percent.
Wind (20 ft)........Light and terrain driven winds becoming northeast
                    at 5 to 10 mph by 10 AM. Gusty and erratic winds
                    expected near thunderstorms late in the afternoon.
Ridgetop wind.......Light winds in the morning becoming northeast
                    at 5 to 10 mph by 10 AM. Gusty and erratic winds
                    expected near thunderstorms late in the afternoon.
Mixing height.......7500 ft AGL.
Transport winds.....Light winds becoming east around 5 mph late in
                    the morning, then shifting to the south around
                    8 mph late in the afternoon shifting to the
                    northwest late in the afternoon.
Ventilation Index...Low (30) increasing to low to moderate
                    (200-300) in the afternoon.

$$
Forecaster...Day
Requested by...Gary Sampson
Type of request...WILDFIRE
.TAG 2619668.0/PDT
.DELDT 08/13/26
.FormatterVersion 2.0.0
.EMAIL antone.moody@ctwsbnr.org,gary.sampson@ctwsbnr.org,charles.hudson@ctwsbnr.org,micah.david@ctwsbnr.org