FNUS76 KPDT 231911 FWSPDT Spot Forecast for McCully and North Pole Fires...RIST National Weather Service Pendleton OR 1211 PM PDT Sun Aug 23 2026 Forecast is based on forecast start time of 1800 PDT on August 23. ***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 transport wind multiplied by the mixing height in 100's of ft. Categories are a generalized indicator only: low (< 200), moderate (200-500), high (500-700), and very high (> 700). *** If you have questions or concerns with this forecast, please contact our office at (541) 276-8134. .DISCUSSION... High pressure will be building over the region over then next 24 hours, with no chances for wetting rains, and dry lightning a less than 5% chance over the burn area. Relative humidity in the afternoon Tonight recovers to about 55% before returning to around 15% by Monday afternoon. .TONIGHT... Sky/weather.........Mostly clear (5-15 percent). Patchy smoke overnight. Smoke early in the morning. CWR.................0 percent. Chance of lightning.0 percent. Min temperature.....Around 50. Max humidity........51-56 percent. Wind (20 ft)........Northwest winds 5 to 7 mph shifting to the north early in the evening, then becoming light late in the evening becoming southeast around 5 mph early in the morning. Ridgetop wind.......Northwest winds 10 to 15 mph shifting to the north early in the evening, then becoming light late in the evening becoming southeast around 8 mph early in the morning. Mixing height.......500 ft AGL in the evening and overnight then 500 ft AGL early in the morning. Transport winds.....West around 9 mph shifting to the north 6 to 8 mph early in the evening, then shifting to the southeast 5 to 6 mph overnight. Ventilation Index...Low (140) decreasing to low (30) overnight. TIME (PDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM Chc of ltng (%).0 0 0 0 0 0 0 0 0 0 0 0 Temp............66 63 56 55 53 52 52 51 51 50 50 49 RH..............26 36 47 52 54 55 52 52 50 49 49 47 20 FT wind dir..NW NW N N NE NE NE E E E SE SE 20 FT wind spd..6 6 6 5 5 4 4 4 4 4 4 5 20 FT wind gust.10 8 7 6 6 5 5 6 .MONDAY... Sky/weather.........Sunny (20-30 percent) then becoming partly sunny (50-60 percent). Smoke in the morning, then areas of smoke late in the morning. CWR.................0 percent. Chance of lightning.3 percent. Max temperature.....Around 80. Min humidity........14-19 percent. Wind (20 ft)........Southeast winds 5 to 7 mph early in the morning becoming light, then becoming southwest 5 to 7 mph in the late morning and afternoon shifting to the north around 5 mph. Ridgetop wind.......Southeast winds 6 to 9 mph early in the morning then becoming southwest 6 to 9 mph in the late morning and afternoon shifting to the north around 8 mph. Mixing height.......9100 ft AGL. Transport winds.....South 6 to 14 mph shifting to the west around 5 mph late in the afternoon. Ventilation Index...Low (50) increasing to very high (880) in the afternoon. .MONDAY NIGHT... Sky/weather.........Mostly cloudy (55-65 percent) then becoming partly cloudy (25-35 percent). Areas of smoke early in the evening, then patchy smoke early in the evening. Areas of smoke late in the evening. CWR.................0 percent. Chance of lightning.3 percent. Min temperature.....56-59. Max humidity........35-40 percent. Wind (20 ft)........North winds 5 to 7 mph shifting to the southeast 5 to 8 mph late in the evening. Ridgetop wind.......North winds 6 to 9 mph shifting to the southeast 6 to 9 mph late in the evening. Mixing height.......5400 ft AGL early in the evening then 500 ft AGL late in the evening. Transport winds.....West around 5 mph shifting to the northeast around 7 mph early in the evening, then shifting to the southeast 8 to 9 mph late in the evening. Ventilation Index...Low (60) decreasing to low (40) overnight. .TUESDAY... Sky/weather.........Sunny (15-25 percent) then becoming partly sunny (55-65 percent). Areas of smoke early in the morning. CWR.................0 percent. Chance of lightning.8 percent. Max temperature.....79-82. Min humidity........17-22 percent. Wind (20 ft)........Southeast winds 5 to 8 mph shifting to the south late in the morning. Ridgetop wind.......Southeast winds 7 to 10 mph shifting to the south late in the morning. Mixing height.......11200 ft AGL. Transport winds.....South 9 to 15 mph. Ventilation Index...Low (40) increasing to very high (1050) in the afternoon. $$ Forecaster...Russell Requested by...Jessi Ouzts Type of request...WILDFIRE .TAG 2620317.0/PDT .DELDT 08/23/26 .FormatterVersion 2.0.0 .EMAIL jessi_ouzts@firenet.gov,melania_stoeber@firenet.gov