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