FNUS76 KPDT 202351 FWSPDT Spot Forecast for Flank 1 RX...USFS National Weather Service Pendleton OR 451 PM PDT Mon Apr 20 2026 Forecast is based on ignition time of 0600 PDT on April 21. ***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...Incoming system is expected to bring a wind shift from the south to the northwest around or after 5PM Tuesday afternoon. Winds are expected to shift to the west and strengthen around 12AM Tuesday night. Shower chances will increase to between 60-70% after 2PM, with a slight chance (~15%) of an isolated thunderstorm impacting the burn site. Heaviest precip will be expected Tuesday afternoon, with much lighter showers Tuesday night and Wednesday. .TUESDAY... Sky/weather.........Mostly cloudy (80-90 percent). Chance of rain in the morning, then rain showers likely and slight chance of thunderstorms in the afternoon. CWR.................0 percent increasing to 48 percent. Chance of lightning.15 percent. Max temperature.....53-56. Min humidity........47-52 percent. Wind (20 ft)........South winds 5 to 11 mph shifting to the west after 4PM, then shifting to the northwest after 5PM. Gusty and erratic winds expected near thunderstorms late in the afternoon. Mixing height.......3900 ft AGL. Transport winds.....South 13 to 20 mph shifting to the west around 10 mph late in the afternoon. TIME (PDT) 6 AM 8 AM 10 AM NOON 2 PM 4 PM Chc of ltng (%).0 0 0 10 20 20 Temp............42 43 48 50 51 50 RH..............67 68 56 51 52 56 20 ft wind......S 6 S 8 S 11 S 11 SW 8 SW 7 20 ft wind gust.10 12 15 17 16 13 .TUESDAY NIGHT... Sky/weather.........Mostly cloudy (80-90 percent). Rain likely in the evening. Chance of snow through the night. Chance of rain overnight. CWR.................48 percent decreasing to 9 percent late in the evening, then increasing to 21 percent early in the morning. Chance of lightning.12 percent. Min temperature.....32-35. Max humidity........85-90 percent. Wind (20 ft)........Northwest winds 5 to 10 mph shifting to the west 10 to 15 mph with gusts up to 33 mph after midnight. Mixing height.......1300 ft AGL. Transport winds.....Northwest 10 to 16 mph increasing to west 28 to 32 mph overnight. .WEDNESDAY... Sky/weather.........Mostly cloudy (70-80 percent). Chance of snow in the morning, then snow likely late in the morning. Slight chance of rain and snow late in the afternoon. CWR.................21 percent decreasing to 2 percent late in the afternoon. Chance of lightning.5 percent. Max temperature.....44-47. Min humidity........56-61 percent. Wind (20 ft)........West winds 12 to 19 mph with gusts increasing from 27 mph to around 40 mph around 9AM, then gusts decreasing to around 31 mph after 12PM. Mixing height.......4700 ft AGL. Transport winds.....West 32 to 35 mph. $$ Forecaster...Lawhorn Requested by...Sean Carroll Type of request...PRESCRIBED.TAG 2610576.1/PDT .DELDT 04/20/26 .FormatterVersion 2.0.0 .EMAIL sean.carroll@usda.gov