027 FNUS76 KPDT 091749 CCA FWSPDT Spot Forecast for Waptus Lake...CWICC. CORRECTED FORMATTING. National Weather Service Pendleton OR 1040 AM PDT Tue Sep 9 2025 Forecast is based on forecast start time of 1000 PDT on September 09. ***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...Unsettled weather the next 30 hours with low storm chances today and tomorrow afternoon/evening. Elevated daytime RH and high overnight recovery anticipate at the incident. Winds largely sheltered within the complex terrain; forecast an increase in speed in the afternoon out of the northwest but under 10 mph. While best storm chances are south and north of the fire, risk for storms exist with emphasis on lightning, brief downpours, and gusty winds from developing or approaching storms. .TODAY... Sky/weather.........Mostly cloudy (65-75 percent) then becoming partly sunny (40-50 percent). Scattered rain showers and a slight chance of thunderstorms through late in the morning. Rain showers likely (60%) and chance of thunderstorms in the afternoon. CWR.................25 percent. Chance of lightning.15 percent increasing to 30 percent after noon. Max temperature.....Around 67. Min humidity........53-58 percent. Wind (20 ft)........Light and variable winds 2 to 4 mph becoming northwest 5 to 8 mph by late in the morning. Gusty and erratic winds expected near any thunderstorms. Ridgetop wind.......Northwest winds 5 to 8 mph. Mixing height.......3300 ft AGL. Transport winds.....Northwest 5 to 10 mph. Ventilation Index...Poor (190). TIME (PDT) 10A 11A 12P 1PM 2PM 3PM 4PM 5PM 6PM 7PM 8PM 9PM Chc of ltng (%).10 20 20 20 30 30 30 20 20 20 10 10 Temp............54 57 60 64 66 66 67 65 63 60 56 55 RH..............78 71 67 60 56 56 59 63 71 79 84 80 20 FT wind dir..W NW NW NW NW NW NW NW NW NW NW NW 20 FT wind spd..3 3 4 4 5 5 5 6 6 6 5 5 20 FT wind gust. 8 8 8 6 6 .TONIGHT... Sky/weather.........Mostly cloudy (40-50 percent). Chance of rain showers and slight chance of thunderstorms in the evening. Slight chance of rain showers after midnight (dropping under 15%). CWR.................5 percent. Chance of lightning.19 percent. Min temperature.....51-54. Max humidity........80-90 percent. Wind (20 ft)........Northwest winds 4 to 7 mph in the evening and overnight becoming light drainage winds 1 to 3 mph. Gusty and erratic winds expected near any thunderstorms. Ridgetop wind.......Northwest wind around 5 mph becoming north by 5 am. Mixing height.......250 ft AGL. Transport winds.....North 3 to 6 mph. Ventilation Index...Poor (60-100). .WEDNESDAY... Sky/weather.........Mostly sunny (30-40 percent). Chance of rain showers and a slight chance of thunderstorms in the afternoon. CWR.................5 percent increasing to 20 percent by late in the morning. Chance of lightning.19 percent. Max temperature.....67-69. Min humidity........52-57 percent. Wind (20 ft)........Light 1 to 3 mph becoming northwest 5 to 8 mph late in the afternoon. Gusty and erratic winds expected near any thunderstorms. Ridgetop wind.......North around 5 mph becoming northwest 5 to 8 mph by early afternoon. Mixing height.......3700 ft AGL. Transport winds.....North 6 to 8 mph. Ventilation Index...Poor (60 increasing to 160 in the afternoon). $$ Forecaster...Townsend Requested by...Luis Sierra Type of request...WILDFIRE .TAG 2521637.0/PDT .DELDT 09/09/25 .FormatterVersion 2.0.0 .EMAIL cacwc@firenet.gov