474
FNUS76 KPDT 200217
FWSPDT

Spot Forecast for Butte Creek_0720...ORWSA
National Weather Service Pendleton OR
717 PM PDT Sat Jul 19 2025

Forecast is based on forecast start time of 1900 PDT on July 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...Pressure gradient across the Cascades will relax
tonight, reducing west to northwest winds below 10 mph. Lighter
winds will continue tomorrow and Sunday night. An upper weather
system approaching Sunday will increase cloud cover over the fire
site, while temperatures will cool and afternoon RHs in the upper
20s. Overnight recoveries will good tonight and tomorrow night. A
slight chance of showers will develop late Sunday night, but chance
of wetting rain will be less than 10%.

.REST OF TONIGHT...

Sky/weather.........Partly cloudy (25-35 percent) then becoming
                    mostly cloudy (60-70 percent). Haze early in
                    the evening.
CWR.................0 percent.
Chance of lightning.0 percent.
Min temperature.....53-56.
Max humidity........65-70 percent.
Wind (20 ft)........Northwest winds 10 to 15 mph with gusts to
around 25 mph shifting to the west 5 to 10 mph
around 11PM.
Mixing height.......800 ft AGL.
Transport winds.....West 13 to 20 mph decreasing to around 10 mph
                    early in the morning.
Ventilation Index...Fair (450) decreasing to poor (100) overnight.

TIME (PDT)      7 PM   9 PM   11 PM  1 AM   3 AM   5 AM
Chc of ltng (%).0      0      0      0      0      0
Temp............74     66     61     58     56     55
RH..............39     50     57     60     64     68
20 ft wind......NW 14  NW 11  W 7    W 7    W 5    W 5
20 ft wind gust.23     19     13     13     10     6

.SUNDAY...

Sky/weather.........Partly sunny (60-70 percent) then becoming
                    cloudy (85-95 percent). Haze late in the
                    afternoon.
CWR.................0 percent.
Chance of lightning.3 percent.
Max temperature.....79-82.
Min humidity........28-33 percent.
Wind (20 ft)........West winds 5 to 10 mph.
Mixing height.......4800 ft AGL.
Transport winds.....West 10 to 16 mph.
Ventilation Index...Poor (170) increasing to good (600) in the
                    afternoon.

.SUNDAY NIGHT...

Sky/weather.........Mostly cloudy (70-80 percent) then becoming
                    partly cloudy (35-45 percent). Haze early in
                    the evening.
CWR.................0 percent.
Chance of lightning.4 percent.
Min temperature.....52-55.
Max humidity........68-73 percent.
Wind (20 ft)........West winds 5 to 10 mph decreasing to 3 to 7 mph
after 11PM.
Mixing height.......800 ft AGL.
Transport winds.....West 7 to 15 mph.
Ventilation Index...Fair (250) decreasing to poor (80) overnight.

$$
Forecaster...Lawhorn
Requested by...Antone Moody
Type of request...WILDFIRE
.TAG 2518292.0/PDT
.DELDT 07/19/25
.FormatterVersion 2.0.0
.EMAIL antone.moody@ctwsbnr.org