507 
FNUS76 KPDT 200920
FWSPDT

Spot Forecast for Butte Creek_7/20/25...ORWSA
National Weather Service Pendleton OR
220 AM PDT Sun Jul 20 2025

Forecast is based on forecast start time of 0600 PDT on July 20. 
***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...Relaxing pressure gradient across the Cascades tonight
has resulted in west to northwest winds below 10 mph. An upper weather 
system approaching today will increase cloud cover over the fire site, 
cooling temperatures and keeping afternoon RHs in the upper 20s. 
Expect a return of increased winds this afternoon and evening, gusts 
15-20 mph. Good overnight recoveries early this morning and tonight. 
A slight chance of showers will develop late tonight, but chance of 
wetting rain will be less than 10%.

.TODAY...

Sky/weather.........Partly sunny (60-70 percent). Areas of smoke. 
CWR.................0 percent. 
Chance of lightning.4 percent. 
Max temperature.....78-82. 
Min humidity........27-34 percent. 
Wind (20 ft)........West winds 5 to 12 mph with gusts up to 15-20 
                    mph. 
Mixing height.......4300 ft AGL. 
Transport winds.....West 10 to 16 mph. 
Ventilation Index...Poor (170) increasing to good (510) in the 
                    afternoon. 

TIME (PDT)      6 AM   8 AM   10 AM  NOON   2 PM   4 PM   
Chc of ltng (%).0      0      0      0      0      0      
Temp............55     62     69     73     76     76     
RH..............75     56     41     34     33     33     
20 ft wind......W 5    W 7    W 7    W 10   NW 11  NW 12  
20 ft wind gust.7      10     10     13     15     18     

.TONIGHT...

Sky/weather.........Cloudy (85-95 percent) then becoming partly 
                    cloudy (40-50 percent). Areas of smoke through 
                    the night. Slight chance of rain showers late 
                    in the evening. 
CWR.................0 percent. 
Chance of lightning.4 percent. 
Min temperature.....53-56. 
Max humidity........70-76 percent. 
Wind (20 ft)........Northwest winds 5 to 10 mph with gusts up to 15 
                    mph around midnight. 
Mixing height.......800 ft AGL. 
Transport winds.....West 7 to 16 mph. 
Ventilation Index...Fair (290) decreasing to poor (50) overnight. 

$$
Forecaster...NWS Portland
Requested by...Antone Moody
Type of request...WILDFIRE
.TAG 2518299.0/PDT
.DELDT 07/20/25
.FormatterVersion 2.0.0
.EMAIL Antone.moody@ctwsbnr.org