393
FNUS76 KPDT 190642
FWSPDT

Spot Forecast for Columbia Way Fire...USFWS
National Weather Service Pendleton OR
1142 PM PDT Wed Jun 18 2025

Forecast is based on forecast start time of 0700 PDT on June 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 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...Excellent (70-75%) humidity recoveries Thursday
morning will lead to a 10% improvement in afternoon humidities and
cooler high temperatures than on Wednesday. Winds will stay light,
but will begin to increase overnight as a system approaches and
moves over the fire area Friday. Winds will peak Friday morning,
but will stay elevated through the day. This system will also
increase instability and mixing heights in the afternoon, with a
slight chance of a shower late in the afternoon.

.JUNETEENTH...

Sky/weather.........Mostly sunny (45-55 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Max temperature.....74-77.
Min humidity........25-30 percent.
Wind (20 ft)........Southwest winds 5 to 10 mph shifting to the
                    west 2 to 6 mph by 11 AM.
Mixing height.......5500 ft AGL.
Transport winds.....Southwest 8 to 10 mph.
Ventilation Index...Poor (140) increasing to fair (360) 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............57     59     63     65     70     73
RH..............71     64     51     43     33     31
20 ft wind......SW 9   SW 8   W 5    W 4    WNW 4  W 5
20 ft wind gust.12

.THURSDAY NIGHT...

Sky/weather.........Mostly cloudy (65-75 percent).
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....Around 60.
Max humidity........62-67 percent.
Wind (20 ft)........Breezy. West winds 2 to 6 mph becoming
                    southwest 12 to 20 mph with gusts up to 30 mph
                    after 10 PM, peaking after 2 AM.
Mixing height.......800 ft AGL.
Transport winds.....Southwest 10 to 16 mph increasing to around 30
                    mph.
Ventilation Index...Fair (360) decreasing to poor (160) overnight.

.FRIDAY...

Sky/weather.........Mostly cloudy (70-80 percent). Slight chance
                    (10-20 percent) of rain showers after 5 PM.
CWR.................2 percent.
Chance of lightning.4 percent.
Max temperature.....66-69.
Min humidity........37-42 percent.
Wind (20 ft)........Windy. Southwest winds 12 to 20 mph with gusts
                    up to 30 mph increasing 17 to 25 mph with
                    gusts up to 33 mph after 6 AM and peaking
                    through 10 AM. Winds drop slightly 15 to 20 mph
                    through the afternoon.
Mixing height.......7800 ft AGL.
Transport winds.....Southwest 24 to 31 mph.
Ventilation Index...Good (530) increasing to excellent (1050) in
                    the afternoon.

$$
Forecaster...Callihan
Requested by...Christian Meyer
Type of request...WILDFIRE
.TAG 2516166.1/PDT
.DELDT 06/19/25
.FormatterVersion 2.0.0
.EMAIL christian_meyer@fws.gov