FNUS76 KPDT 221156 FWSPDT Spot Forecast for TANEUM CREEK...USFS National Weather Service Pendleton OR 456 AM PDT Sat Aug 22 2026 Forecast is based on forecast start time of 0600 PDT on August 22. ***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. ...RED FLAG WARNING IN EFFECT UNTIL NOON PDT TODAY FOR ABUNDANT LIGHTNING... .DISCUSSION...A weather system moving through the region will bring a slight chance (15-25%) of thunderstorms to the fire area this afternoon with chances diminishing in the evening. Breezy winds from the northwest will develop late in the morning, and persist into the evening before weakening overnight. Expect winds to increase again tomorrow afternoon, but are not expected to be as strong as today. Cooler, moist air from west of the Cascade crest will bring RHs into the mid 40s today and Sunday, with good overnight recovery. .TODAY... Sky/weather.........Partly sunny (55-65 percent) then becoming sunny (15-25 percent). Chance of showers. Slight chance of thunderstorms late in the morning. CWR.................4 percent. Chance of lightning.18 percent. Max temperature.....74-77. Min humidity........43-48 percent. Wind (20 ft)........West winds 5 to 8 mph shifting to the northwest around 8AM, then increasing to 9 to 15 mph with gusts to around 24 mph around 11AM. Gusty and erratic winds expected near thunderstorms late in the morning. Ridgetop wind.......West winds 5 to 10 mph shifting to the northwest around 8AM, then increasing to 14 to 19 mph with gusts up to 28 mph around 11AM. Gusty and erratic winds expected near thunderstorms late in the morning Mixing height.......2500 ft AGL. Transport winds.....West 8 to 16 mph increasing to around 21 mph late in the afternoon. Ventilation Index...Low (50) increasing to moderate (270) in the afternoon. TIME (PDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM Chc of ltng (%).10 10 10 10 10 20 20 20 20 20 20 0 Temp............63 62 63 64 66 69 72 72 73 72 70 68 RH..............62 67 67 63 60 55 52 49 47 45 50 53 20 FT wind dir..W W NW NW NW NW NW NW NW NW NW NW 20 FT wind spd..7 7 8 8 9 10 12 12 13 13 14 14 20 FT wind gust. 15 18 19 21 21 23 24 .TONIGHT... Sky/weather.........Partly cloudy (20-30 percent) then becoming mostly cloudy (45-55 percent) then becoming partly cloudy (45-55 percent) then becoming mostly cloudy (45-55 percent). CWR.................0 percent. Chance of lightning.2 percent. Min temperature.....52-55. Max humidity........73-78 percent. Wind (20 ft)........Northwest winds 9 to 15 mph with gusts to around 24 mph decreasing to 6 to 11 mph after 1AM. Ridgetop wind.......Northwest winds 14 to 19 mph with gusts to around 28 mph decreasing to 9 to 15 mph after 1AM. Mixing height.......500 ft AGL. Transport winds.....West 16 to 21 mph. Ventilation Index...Moderate (290) decreasing to low (80) overnight. .SUNDAY... Sky/weather.........Partly sunny (45-55 percent) then becoming sunny (15-25 percent).CWR.................0 percent. Chance of lightning.2 percent. Max temperature.....Around 70. Min humidity........43-48 percent. Wind (20 ft)........Northwest winds 5 to 11 mph increasing to 8 to 13 mph with gusts up to 21 mph around 9AM. Ridgetop wind.......Northwest winds 9 to 15 mph with gusts to around 24 mph. Mixing height.......3900 ft AGL. Transport winds.....Northwest 16 to 18 mph. Ventilation Index...Moderate (290) increasing to high (530) in the afternoon. $$ Forecaster...Lawhorn Requested by...CERD Type of request...WILDFIRE .TAG 2619886.4/PDT .DELDT 08/22/26 .FormatterVersion 2.0.0 .EMAIL michael.barajas@usda.gov