167 FNUS76 KPDT 291652 FWSPDT Spot Forecast for Boulder...USFS National Weather Service Pendleton OR 952 AM PDT Tue Jul 29 2025 Forecast is based on forecast start time of 0900 PDT on July 29. ***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. ...RED FLAG WARNING IN EFFECT FROM 2 PM THIS AFTERNOON TO 11 PM PDT THIS EVENING FOR ABUNDANT LIGHTNING... ...FIRE WEATHER WATCH IN EFFECT FROM WEDNESDAY AFTERNOON THROUGH THURSDAY MORNING FOR ABUNDANT LIGHTNING... .DISCUSSION...A slight chance to chance of showers and thunderstorms is forecast each day through the remainder of the week. Highest chances will be Wednesday and Thursday during the afternoon, but there is a 30-40% chance of nocturnal showers and thunderstorms tonight and Wednesday night. Showers and thunderstorms will be capable of producing strong, gusty outflow winds of 40-60 mph. .REST OF TODAY... Sky/weather.........Sunny (20-30 percent) then becoming mostly cloudy (75-90 percent). Chance of showers and thunderstorms in the afternoon. CWR.................0 percent increasing to 25 percent in the afternoon. Chance of lightning.35 percent. Max temperature.....89-92. Min humidity........12-17 percent. Wind (20 ft)........Terrain-driven 2-5 mph in the morning, becoming northeast winds 4-8 mph with gusts up to 15 mph in the afternoon. Gusty and erratic winds expected near thunderstorms in the afternoon. Ridgetop wind.......Terrain-driven 2-5 mph in the morning, becoming northeast winds 4-8 mph with gusts up to 15 mph in the afternoon. Gusty and erratic winds expected near thunderstorms in the afternoon. Mixing height.......Increasing to 12500-13000 ft AGL by afternoon. Transport winds.....Light in the morning, becoming northeast 5-10 mph in the afternoon. Ventilation Index...Poor (60) increasing to good (610) in the afternoon. TIME (PDT) 9 AM 11 AM 1 PM 3 PM 5 PM 7 PM Chc of ltng (%).0 20 20 20 40 40 Temp............71 80 85 88 89 84 RH..............34 23 19 16 15 20 20 ft wind......NE 4 NE 5 NE 7 NE 8 N 10 N 10 20 ft wind gust. 15 15 15 15 .TONIGHT... Sky/weather.........Mostly cloudy (70-80 percent). Chance of showers and thunderstorms in the evening. CWR.................25 percent. Chance of lightning.35 percent. Min temperature.....56-59. Max humidity........56-61 percent. Wind (20 ft)........Northeast winds 8-12 mph with gusts of 15-20 mph in the early evening, becoming east 5-10 mph late evening, then terrain-driven 2-5 mph overnight. Gusty and erratic winds expected near thunderstorms. Ridgetop wind.......Northeast winds 8-12 mph with gusts of 15-20 mph in the early evening, becoming east 5-10 mph late evening, then terrain-driven 2-5 mph overnight. Gusty and erratic winds expected near thunderstorms. Mixing height.......Decreasing to 600-800 ft AGL overnight. Transport winds.....Northeast 10-15 mph in the early evening shifting to the east 10-15 mph late evening, then becoming northeast 4-6 mph overnight. Ventilation Index...Good (510) decreasing to poor (60) overnight. .WEDNESDAY... Sky/weather.........Partly to mostly cloudy (50-80 percent) then becoming mostly sunny (40-50 percent). Slight chance of showers and thunderstorms late in the morning. Chance of showers and thunderstorms late in the afternoon. CWR.................50 percent in the afternoon. Chance of lightning.35 percent. Max temperature.....89-92. Min humidity........14-19 percent. Wind (20 ft)........Terrain-driven winds 2-5 mph early morning, becoming northeast 5-8 mph with gusts up to 15 mph late morning and afternoon. Gusty and erratic winds expected near thunderstorms. Ridgetop wind.......Terrain-driven winds 2-5 mph early morning, becoming northeast 5-8 mph with gusts up to 15 mph late morning and afternoon. Gusty and erratic winds expected near thunderstorms. Mixing height.......Increasing to 10000-10500 ft AGL by afternoon. Transport winds.....Northeast 4-6 mph in the morning, becoming east 8-13 mph in the afternoon. Ventilation Index...Poor (40) increasing to good (520) in the afternoon. $$ Forecaster...Plunkett Requested by...Connolly Type of request...WILDFIRE .TAG 2518806.0/PDT .DELDT 07/29/25 .FormatterVersion 2.0.0 .EMAIL orcoc@firenet.gov