305
FNUS76 KPDT 300431
FWSPDT

Spot Forecast for Pendleton KOA Fire...Umatilla Sheriffs Office
National Weather Service Pendleton OR
931 PM PDT Fri Aug 29 2025

Forecast is based on forecast start time of 2200 PDT on August 29.
***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...Winds will be less than 10 mph through tomorrow night,
with winds from the south overnight, then shifting to the north
in the afternoons. Local terrain influences may result in winds
more west southwest in the overnight period, and northeast in the
daytime. Thunderstorm/shower chances will be near zero through
tomorrow. Moderate relative humidity recovery overnight, with
afternoon RHs in the mid teens tomorrow.

.REST OF TONIGHT...

Sky/weather.........Mostly clear (10-20 percent). Haze.
CWR.................0 percent.
Chance of lightning.2 percent.
Min temperature.....Around 60.
Max humidity........47-52 percent.
Wind (20 ft)........East winds around 5 mph shifting to the south 4
                    to 7 mph after 11PM.
Mixing height.......700 ft AGL.
Transport winds.....Northeast around 5 mph shifting to the south 6
                    to 7 mph late in the evening.
Ventilation Index...Poor (40) overnight.

TIME (PDT)      10 PM  MIDNGT 2 AM   4 AM   6 AM   8 AM
Chc of ltng (%).0      0      0      0      0      0
Temp............71     67     64     60     58     68
RH..............42     46     47     52     52     39
20 ft wind......E 5    S 5    S 5    S 5    S 5    SW 5
20 ft wind gust.6      6      6      6      6      6

.SATURDAY...

Sky/weather.........Sunny (10-20 percent). Haze early in the
                    morning.
CWR.................0 percent.
Chance of lightning.1 percent.
Max temperature.....95-98.
Min humidity........14-19 percent.
Wind (20 ft)........South winds 4 to 7 mph shifting to the west after
8AM, then shifting to the north 5 to 8 mph after
                    11AM.
Mixing height.......5300 ft AGL.
Transport winds.....Southwest 5 to 7 mph shifting to the north
                    around 7 mph late in the afternoon.
Ventilation Index...Poor (60) increasing to fair (240) in the
                    afternoon.

.SATURDAY NIGHT...

Sky/weather.........Partly cloudy (30-40 percent). Haze overnight.
CWR.................0 percent.
Chance of lightning.1 percent.
Min temperature.....62-65.
Max humidity........49-54 percent.
Wind (20 ft)........North winds 5 to 8 mph shifting to the south 5
                    to 7 mph after 11PM.
Mixing height.......700 ft AGL.
Transport winds.....North 6 to 7 mph shifting to the south 5 to 6
                    mph late in the evening.
Ventilation Index...Poor (130) decreasing to poor (30) overnight.

$$
Forecaster...Lawhorn
Requested by...Karen Primmer
Type of request...WILDFIRE
.TAG 2520979.0/PDT
.DELDT 08/29/25
.FormatterVersion 2.0.0
.EMAIL karen.primmer@umatillacounty.gov