972 
FNUS76 KPDT 100152
FWSPDT

Spot Forecast for Big Hole Fire...US Forest Service
National Weather Service Pendleton OR
652 PM PDT Tue Sep 9 2025

Forecast is based on forecast start time of 0800 PDT on September 10. 
***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...Shower and thunderstorm chances will continue for
the region as a low pressure system moves into the Pacific 
Northwest. Rain chances will be at their greatest during the day 
Wednesday, before shower chances generally start to shift 
eastward. Isolated storms are possible, but are expected to be 
wetting in nature should any occur. Winds will generally remain 
light out of the west-northwest over the next couple of days.


.WEDNESDAY...

Sky/weather.........Mostly cloudy (75-85 percent). Rain showers 
                    likely (70-80 percent) and a chance of 
                    thunderstorms (25-35 percent) throughout the
                    day. 
CWR.................31 percent increasing to 70 percent late in the 
                    morning. 
Chance of lightning.35 percent. 
Max temperature.....64-67. 
Min humidity........59-64 percent. 
Wind (20 ft)........Northwest winds 5 to 8 mph. Gusty and erratic 
                    winds expected near thunderstorms. 
Mixing height.......2600 ft AGL. 
Transport winds.....North around 7 mph shifting to the West 
                    late in the afternoon. 
Ventilation Index...Poor (40) increasing to poor (100) in the 
                    afternoon. 

TIME (PDT)      8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM 6PM 7PM 
Chc of ltng (%).10  10  10  30  30  30  40  40  40  20  20  20  
Temp............45  50  55  60  63  64  64  61  64  63  63  58  
RH..............99  98  84  74  66  64  64  68  64  69  65  73  
20 FT wind dir..W   W   W   NW  NW  NW  NW  NW  NW   W   W   W   
20 FT wind spd..4   4   4   4   4   4   5   5   5   5   5   5   
20 FT wind gust.6   6   6   8   8   8   10  10  10  10  10  10  

.WEDNESDAY NIGHT...

Sky/weather.........Mostly cloudy (80-90 percent). Rain showers
                    likely (60-70 percent) with a slight chance
                    of thunderstorms (15-25 percent) early in 
                    the evening, then chance of showers (35-
                    45 percent) overnight. 
CWR.................70 percent decreasing to 8 percent. 
Chance of lightning.22 percent. 
Min temperature.....40-43. 
Max humidity........95-100 percent. 
Wind (20 ft)........West-Northwest winds 5 to 8 mph. Gusty and 
                    erratic winds expected near thunderstorms. 
Mixing height.......500 ft AGL. 
Transport winds.....West-Northwest 5 to 12 mph. 
Ventilation Index...Poor (130) decreasing to poor (60) overnight. 

.THURSDAY...

Sky/weather.........Mostly cloudy (65-75 percent). Chance of showers
                    (45-55 percent) with a slight chance of 
                    thunderstorms (15-25 percent). 
CWR.................8 percent increasing to 43 percent late in the 
                    morning, then decreasing to 3 percent late in 
                    the afternoon. 
Chance of lightning.29 percent. 
Max temperature.....66-69. 
Min humidity........51-56 percent. 
Wind (20 ft)........Northwest winds 5 to 8 mph. Gusty and erratic 
                    winds expected near thunderstorms. 
Mixing height.......3400 ft AGL. 
Transport winds.....Northwest 9 to 13 mph. 
Ventilation Index...Poor (90) increasing to fair (300) in the 
                    afternoon. 

$$
Forecaster...Evans
Requested by...Ella Nichols
Type of request...WILDFIRE
.TAG 2521684.0/PDT
.DELDT 09/10/25
.FormatterVersion 2.0.0
.EMAIL ella.nichols12@gmail.com,thomas.alvut@usda.gov