FNUS76 KPDT 150008 FWSPDT Spot Forecast for Muddy Run RX...OR- WSA National Weather Service Pendleton OR 508 PM PDT Wed Oct 14 2026 Forecast is based on ignition time of 1800 PDT on October 14. ***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...Winds will be light and diurnally driven through tomorrow night, then becoming southerly winds by Friday morning. Afternoon RHs will be in the mid 30s tomorrow, then low 20s Friday afternoon. Overnight recoveries will be good to excellent. Low level inversion will lift around 10AM, but mid level inversion persisting into the afternoon will limit any smoke ventilation. The low level inversion is expected to redevelop around 6PM, then lift again around 11AM, but once again ventilation will be limited due to persistent mid level inversion. .TONIGHT... Sky/weather.........Mostly clear (0-10 percent). CWR.................0 percent. Chance of lightning.0 percent. Min temperature.....41-44. Max humidity........83-88 percent. Wind (20 ft)........Light upslope winds becoming west winds 4 to 7 mph around 8PM. Mixing height.......1300 ft AGL early in the evening. Transport winds.....Northeast around 6 mph shifting to the northwest 5 to 6 mph early in the evening, then becoming light early in the morning. Ventilation Index...Low (40) 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............63 59 54 52 51 50 48 48 47 46 44 43 RH..............49 58 64 68 70 73 74 76 77 79 80 81 20 FT wind dir..E N W W W W W W W W W W 20 FT wind spd..3 3 5 5 5 5 5 4 5 6 5 2 20 FT wind gust. .THURSDAY... Sky/weather.........Sunny (5-15 percent). CWR.................0 percent. Chance of lightning.0 percent. Max temperature.....66-69. Min humidity........34-39 percent. Wind (20 ft)........Northwest winds 4 to 7 mph shifting to the southeast after 11AM, then shifting northeast after 3PM. Mixing height.......2700 ft AGL early in the morning. Transport winds.....Light winds becoming southeast 8 to 10 mph late in the morning, then shifting to the northeast around 8 mph late in the afternoon. Ventilation Index...Low (30) increasing to low (190) in the afternoon. .THURSDAY NIGHT... Sky/weather.........Mostly clear (15-25 percent). CWR.................0 percent. Chance of lightning.0 percent. Min temperature.....40-43. Max humidity........66-71 percent. Wind (20 ft)........North winds 4 to 8 mph shifting to the northwest around 8PM, then shifting to the southwest after 12AM. Mixing height.......1200 ft AGL early in the evening then 500 ft AGL late in the evening. Transport winds.....North around 8 mph in the evening becoming light, then becoming south around 6 mph early in the morning. Ventilation Index...Low (50) decreasing to low (30) overnight. .FRIDAY... Sky/weather.........Sunny (15-25 percent). CWR.................0 percent. Chance of lightning.0 percent. Max temperature.....74-77. Min humidity........20-25 percent. Wind (20 ft)........Southwest winds 4 to 7 mph shifting to the south 5 to 11 mph around 9AM. Mixing height.......2800 ft AGL late in the morning. Transport winds.....South 6 to 10 mph shifting to the east around 7 mph late in the afternoon. Ventilation Index...Low (30) increasing to low (180) in the afternoon. $$ Forecaster...Lawhorn Requested by...Lilian Libokmeto Type of request...PRESCRIBED .TAG 2623745.1/PDT .DELDT 10/14/26 .FormatterVersion 2.0.0 .EMAIL joshua.sohappy@ctwsbnr.org