370
FNUS76 KPDT 210534
FWSPDT

Spot Forecast for Butte_creek_072125...ORWSA
National Weather Service Pendleton OR
1034 PM PDT Sun Jul 20 2025

Forecast is based on forecast start time of 0700 PDT on July 21.
***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...West to northwest winds up to 10 mph will impact
the fire site Monday and Tuesday, with light downslope winds
overnight. A weather system arriving to the area will bring a
slight chance showers through Monday afternoon, but chances of
wetting rain will be less than 10%. Cloudy conditions will result
in cooler conditions, but will result in poor dispersion of
smoke during the day.

.MONDAY...

Sky/weather.........Partly sunny (50-60 percent) then becoming
                    sunny (10-20 percent). Slight chance of rain
                    showers in the morning and early afternoon.
                    Areas of smoke through the day.
CWR.................4 percent.
Chance of lightning.10 percent.
Max temperature.....74-77.
Min humidity........34-39 percent.
Wind (20 ft)........West winds 5 to 10 mph.
Mixing height.......4900 ft AGL.
Transport winds.....West 8 to 14 mph.
Ventilation Index...Poor (130) increasing to fair (450) in the
                    afternoon.

TIME (PDT)      7 AM   9 AM   11 AM  1 PM   3 PM   5 PM
Chc of ltng (%).0      0      10     10     10     0
Temp............54     61     64     70     73     74
RH..............73     62     55     45     40     39
20 ft wind......W 5    W 7    W 8    W 8    W 10   NW 10
20 ft wind gust.6      8      11     11     13     13

.MONDAY NIGHT...

Sky/weather.........Mostly clear (15-25 percent). Areas of smoke.
CWR.................0 percent.
Chance of lightning.4 percent.
Min temperature.....51-54.
Max humidity........80-85 percent.
Wind (20 ft)........West winds 5 to 10 mph becoming light downslope
winds.
Mixing height.......800 ft AGL.
Transport winds.....West 8 to 14 mph.
Ventilation Index...Fair (390) decreasing to poor (90) overnight.

.TUESDAY...

Sky/weather.........Sunny (10-20 percent). Areas of smoke in the
                    morning and early afternoon. Haze early in the
                    morning.
CWR.................0 percent.
Chance of lightning.6 percent.
Max temperature.....82-85.
Min humidity........27-32 percent.
Wind (20 ft)........Light downslope winds becoming west 4 to 7 mph
                    around 11AM, then shifting to the northwest 5
                    to 10 mph after 2PM.
Mixing height.......7700 ft AGL.
Transport winds.....West 5 to 8 mph in the morning becoming light,
                    then becoming northwest 6 to 8 mph late in the
                    afternoon.
Ventilation Index...Poor (70) increasing to fair (240) in the
                    afternoon.

$$
Forecaster...Lawhorn
Requested by...Antone Moody
Type of request...WILDFIRE
.TAG 2518335.0/PDT
.DELDT 07/20/25
.FormatterVersion 2.0.0
.EMAIL antone.moody@ctwsbnr.org