846
FNUS76 KPDT 121156
FWSPDT

Spot Forecast for Duff...Bia-Or-Uma
National Weather Service Pendleton OR
Issued by National Weather Service Seattle WA
456 AM PDT Tue Aug 12 2025

Forecast is based on forecast start time of 0700 PDT on August 12.
***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 the
   transport wind multiplied by the mixing
   height in 100`s of feet. Index categories
   are a generalized indicator only.***

If you have questions or concerns with this forecast, please
contact our office at (541) 276-8134.

.DISCUSSION...Hot and dry conditions will persist at the site
today with high pressure over the region. Minimum humidity values
will drop to 15 to 20 percent by this afternoon. A disturbance
dropping in from the northwest on Wednesday will allow for westerly
winds to increase during the day, with gusts to 25 mph possible
in the vicinity of the site. Conditions will remain hot and dry,
with minimum relative humidity values dropping near 15 to 20
percent again by the afternoon.

.REST OF TODAY...

Sky/weather.........Sunny (0-10 percent).
CWR.................0 percent.
Chance of lightning.0 percent
Max temperature.....95-98.
Min humidity........15-20 percent.
Wind (20 ft)........South winds around 5 mph shifting to the west 5
                    to 8 mph early in the morning, then shifting to
                    the northwest late in the afternoon.
Ridgetop wind.......South around 6 mph shifting to west 5 to 10 mph
                    through the morning.
Mixing height.......7800 ft AGL.
Transport winds.....South around 6 mph shifting to the west 5 to 10
                    mph through the morning.
Ventilation Index...Poor (50) increasing to fair (430) in the
                    afternoon.

TIME (PDT)      7 AM   9 AM   11 AM  1 PM   3 PM   5 PM
Chc of ltng (%).0      0      0      0      0      0
Temp............71     79     84     89     93     93
RH..............39     32     26     23     20     19
20 ft wind......S 5    W 5    NW 7   NW 7   NW 8   NW 8
20 ft wind gust.6      6      10     10     13     13

.TONIGHT...

Sky/weather.........Mostly clear (0-10 percent).
CWR.................0 percent.
Chance of lightning.0 percent
Min temperature.....69-72.
Max humidity........44-49 percent.
Wind (20 ft)........Northwest winds 5 to 8 mph shifting to the
                    south late in the evening.
Ridgetop wind.......Northwest 6 to 10 mph shifting to the southwest
                    12 to 14 mph late this evening.
Mixing height.......700 ft AGL.
Transport winds.....Northwest 6 to 10 mph shifting to the southwest
                    12 to 14 mph late in the evening.
Ventilation Index...Fair (230) decreasing to poor (90) overnight.

.WEDNESDAY...

Sky/weather.........Sunny (0-10 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....89-92.
Min humidity........15-20 percent.
Wind (20 ft)........Southwest winds 5 to 14 mph shifting to the
                    west 10 to 19 mph with gusts to around 26 mph
                    late in the morning.
Ridgetop wind.......Southwest 13 to 20 mph shifting to west around
                    25 mph late in the morning.
Mixing height.......7800 ft AGL.
Transport winds.....Southwest 13 to 21 mph shifting to the west 25
                    to 26 mph late in the morning.
Ventilation Index...Fair (310) increasing to excellent (1050) in
                    the afternoon.

$$
Forecaster...NWS Seattle
Requested by...Sydney Thompson
Type of request...WILDFIRE
.TAG 2519754.0/PDT
.DELDT 08/12/25
.FormatterVersion 2.0.0
.EMAIL SydneyThompson@CTUIR.org,Thompson9076@gmail.com