276 
FNUS76 KPDT 050348
FWSPDT

Spot Forecast for Bridge Fire...US Forest Service
National Weather Service Pendleton OR
848 PM PDT Thu Sep 4 2025

Forecast is based on forecast start time of 0600 PDT on September 05. 
***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.

...FIRE WEATHER WATCH IN EFFECT FROM FRIDAY AFTERNOON THROUGH
FRIDAY EVENING...

.DISCUSSION...Hot, dry and unstable conditions will persist over 
the fire area through Friday evening. Chc of lightning is 15-25% 
through Sat. T-storms will be dry with little precip increasing 
in chcs in the afternoon and are expected to be wetter Sat. Fri min 
RHs will be below 30% increasing to 40% Saturday with overnight 
recoveries being below 60%. Winds will be mostly variable below 10 
mph (see below). The inversion Friday is expected to break around 
1030AM and instability will quickly follow.

.FRIDAY...

Sky/weather.........Sunny (20-30 percent) then becoming partly 
                    sunny (55-65 percent). Areas of smoke through 
                    the day. Slight chance of showers and 
                    thunderstorms late in the morning. 
CWR.................5 percent. 
Chance of lightning.17 percent. 
Max temperature.....74-77. 
Min humidity........23-28 percent. 
Wind (20 ft)........Downslope/down-valley becoming east around 5 mph 
                    around 11 AM. Gusty and erratic winds expected near 
                    thunderstorms beginning around 11 AM. 
Ridgetop wind.......Downslope/down-valley becoming east around 7 mph 
                    around 2 PM. Gusty and erratic winds expected near 
                    thunderstorms beginning around 11 AM. 
Mixing height.......6200 ft AGL late in the morning. 
Transport winds.....Northeast around 5 mph early in the morning 
                    becoming light, then becoming southeast around 
                    5 mph late in the morning becoming light 
                    becoming northwest around 5 mph late in the 
                    afternoon. 
Ventilation Index...Poor (30) increasing to fair (210) in the 
                    afternoon. 

TIME (PDT)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM 
Chc of ltng (%).0   0   0   0   0   20  20  20  20  20  20  20  
Temp............62  61  63  66  69  72  74  74  74  72  71  71  
RH..............41  40  37  36  33  29  29  28  28  31  33  33  
20 FT wind dir..NW  NW  N   N   N   E   E   E   E   E   E   E   
20 FT wind spd..4   4   4   4   4   4   4   4   4   4   4   5   
20 FT wind gust.5   5   5   5   5   7   7   7   8   8   8   7   

.FRIDAY NIGHT...

Sky/weather.........Mostly cloudy (50-60 percent) then becoming 
                    partly cloudy (40-50 percent) then becoming 
                    mostly cloudy (55-65 percent). Areas of smoke 
                    in the evening. Haze early in the evening, then 
                    areas of smoke overnight. Slight chance of 
                    showers and thunderstorms in the evening. 
                    Slight chance of rain showers early in the 
                    morning. 
CWR.................3 percent. 
Chance of lightning.17 percent. 
Min temperature.....Around 60. 
Max humidity........50-55 percent. 
Wind (20 ft)........East winds 5 to 7 mph shifting to the northwest 
                    around 8 PM, then becoming downslope/down-valley
                    around 11 PM. Gusty and erratic winds expected 
                    near thunderstorms through 11 PM. 
Ridgetop wind.......East winds 7 to 9 mph shifting to the northwest 
                    around 8 PM, then becoming downslope/down-valley
                    around 11 PM. Gusty and erratic winds expected 
                    near thunderstorms through 11 PM. 
Mixing height.......1000 ft AGL early in the evening. 
Transport winds.....Northwest 5 to 12 mph. 
Ventilation Index...Poor (40) decreasing to poor (30) overnight. 

.SATURDAY...

Sky/weather.........Partly sunny (60-70 percent). Areas of smoke in 
                    the morning. Haze early in the morning. Slight 
                    chance of rain showers in the morning. Chance 
                    of rain showers and slight chance of 
                    thunderstorms late in the morning. 
CWR.................3 percent increasing to 18 percent late in the 
                    morning, then decreasing to 1 percent late in 
                    the afternoon. 
Chance of lightning.24 percent. 
Max temperature.....69-72. 
Min humidity........39-44 percent. 
Wind (20 ft)........Northwest winds 5 to 7 mph shifting to the east 
                    around 8 AM, then shifting to the south around 11 
                    AM shifting to the north around 5 mph around 5 PM.
                    Gusty and erratic winds expected near thunderstorms 
                    beginning around 11 AM. 
Ridgetop wind.......Northwest winds 7 to 9 mph shifting to the east 
                    around 8 AM, then shifting to the south around 11 
                    AM shifting to the north around 7 mph around 5 PM.
                    Gusty and erratic winds expected near thunderstorms 
                    beginning around 11 AM. 
Mixing height.......4600 ft AGL late in the morning. 
Transport winds.....Northwest around 6 mph shifting to the east 
                    around 5 mph early in the morning, then 
                    shifting to the southeast around 8 mph late in 
                    the morning. 
Ventilation Index...Poor (30) increasing to fair (310) in the 
                    afternoon. 

$$
Forecaster...Bennese
Requested by...Colleen Malaney
Type of request...WILDFIRE
.TAG 2521360.0/PDT
.DELDT 09/04/25
.FormatterVersion 2.0.0
.EMAIL colleen.malaney@usda.gov,chad.lauer@usda.gov,eric.miller@usda.gov,orjdcc@firenet.gov