FNUS76 KPDT 191514 FWSPDT Spot Forecast for McNary Windblown Piles...U.S.W.F.S National Weather Service Pendleton OR 814 AM PDT Thu Mar 19 2026 Forecast is based on ignition time of 0700 PDT on March 19. ***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... Partly sunny conditions and warm temperatures and dry air this afternoon will yield lower relative humidity as low as 20 percent. .REST OF TODAY... Sky/weather.........Mostly cloudy (80-90 percent). CWR.................0 percent. Chance of lightning.1 percent. Max temperature.....75-78. Min humidity........23-28 percent. Wind (20 ft)........South winds 5 to 11 mph shifting to the southwest 5 to 13 mph late in the afternoon. Ridgetop wind.......South winds 5 to 11 mph shifting to the southwest 5 to 13 mph late in the afternoon. Mixing height.......2400 ft AGL. Transport winds.....Southwest 10 to 16 mph increasing to 10 to 18 mph late in the afternoon. Ventilation Index...Poor (70) increasing to fair (320) in the afternoon. TIME (PDT) 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM 6PM Chc of ltng (%).0 0 0 0 0 0 0 0 0 0 0 0 Temp............55 55 59 63 67 70 71 75 74 74 75 73 RH..............51 51 46 45 42 32 31 31 28 28 29 30 20 FT wind dir..S S S S SW SW SW SW SW SW SW SW 20 FT wind spd..8 8 8 8 11 11 11 13 13 13 10 10 20 FT wind gust.10 11 11 11 14 14 14 14 14 14 14 14 .TONIGHT... Sky/weather.........Mostly cloudy (75-85 percent) then becoming partly cloudy (35-45 percent) then becoming mostly cloudy (70-80 percent). CWR.................0 percent. Chance of lightning.1 percent. Min temperature.....55-58. Max humidity........61-66 percent. Wind (20 ft)........South winds 5 to 10 mph. Ridgetop wind.......South winds 8 to 14 mph. Mixing height.......600 ft AGL. Transport winds.....Southwest 10 to 13 mph. Ventilation Index...Poor (70). .FRIDAY... Sky/weather.........Mostly cloudy (75-85 percent). CWR.................0 percent. Chance of lightning.2 percent. Max temperature.....76-79. Min humidity........36-41 percent. Wind (20 ft)........South winds 5 to 12 mph shifting to the southwest 9 to 15 mph late in the afternoon. Ridgetop wind.......South winds 7 to 14 mph shifting to the southwest 11 to 18 mph late in the afternoon. Mixing height.......3000 ft AGL. Transport winds.....South 12 to 16 mph shifting to the west 17 to 22 mph late in the afternoon. Ventilation Index...Poor (70) increasing to fair (360) in the afternoon. $$ Forecaster...Russell Requested by...Brennan Type of request...PRESCRIBED .TAG 2606409.0/PDT .DELDT 03/19/26 .FormatterVersion 2.0.0 .EMAIL benjamin_brennan@fws.gov