FNUS76 KPDT 190227 FWSPDT Spot Forecast for Flank #4...USFS National Weather Service Pendleton OR 727 PM PDT Wed Mar 18 2026 Forecast is based on ignition time of 0900 PDT on March 20. ***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...Moderate (40-50%) overnight humidity recoveries Friday morning as afternoon humidities improve about 10% from Thursday due to an approaching cold front. The front is poised to pass the fire area mid-afternoon, leading to wind gusts peaking near 30 mph and shifting from southwest to west Friday, and eventually northwest on Saturday behind the front. High temperatures will cool considerably on Saturday (-20 degrees) with similar afternoon humidities to Friday. .FRIDAY... Sky/weather.........Mostly sunny (40-50 percent). CWR.................0 percent. Chance of lightning.0 percent. Max temperature.....71-74. Min humidity........23-28 percent. Wind (20 ft)........Southwest winds 5 to 10 mph shifting to the west 10 to 15 mph with gusts up to 27 mph after 1300, peaking between 1400 and 1700. Mixing height.......6500 ft AGL. Transport winds.....Southwest 17 to 24 mph increasing to 28 to 32 mph late in the afternoon. Ventilation Index...Poor (90) increasing to excellent (1050) in the afternoon. TIME (PDT) 9 AM 11 AM 1 PM 3 PM 5 PM 7 PM Chc of ltng (%).0 0 0 0 0 0 Temp............54 64 70 71 68 58 RH..............40 33 28 27 32 48 20 ft wind......S 7 SW 8 SW 12 W 14 W 13 W 9 20 ft wind gust.10 14 23 26 25 18 .FRIDAY NIGHT... Sky/weather.........Mostly cloudy (65-75 percent). CWR.................1 percent. Chance of lightning.0 percent. Min temperature.....Around 40. Max humidity........72-77 percent. Wind (20 ft)........West winds 4 to 8 mph with gusts to around 14 mph. Mixing height.......800 ft AGL. Transport winds.....Southwest around 28 mph becoming west 14 to 15 mph early in the evening. Ventilation Index...Good (630) decreasing to poor (120) overnight. .SATURDAY... Sky/weather.........Partly sunny (50-60 percent). CWR.................1 percent. Chance of lightning.0 percent. Max temperature.....52-55. Min humidity........22-27 percent. Wind (20 ft)........West winds 5 to 10 mph becoming northwest 6 to 12 mph with gusts up to 20 mph after 1000. Mixing height.......4500 ft AGL. Transport winds.....West 14 to 16 mph shifting to the north around 13 mph late in the afternoon. Ventilation Index...Poor (170) increasing to good (520) in the afternoon. $$ Forecaster...Callihan Requested by...Natalie Kuntz Type of request...PRESCRIBED .TAG 2606443.0/PDT .DELDT 03/18/26 .FormatterVersion 2.0.0 .EMAIL natalie.kuntz@usda.gov,peter.trask@usda.gov