FNUS76 KPDT 181545 FWSPDT Spot Forecast for Porcupine Ridge Fire...NW CIMT 10 National Weather Service Pendleton OR 845 AM PDT Sat Jul 18 2026 Forecast is based on forecast start time of 0800 PDT on July 18. ***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 10 PM PDT THIS EVENING... .DISCUSSION...High pressure strengthens over the fire area this weekend, keeping skies clear as a warming and drying continues. Inversion sets up around 2200 and breaks up between 0700-0800 Sunday morning. .REST OF TODAY... Sky/weather.........Sunny (0-5 percent). Patchy smoke. CWR.................0 percent. Chance of lightning.0 percent. Max temperature.....84-88. Min humidity........18-23 percent. Wind (20 ft)........West winds 5 to 10 mph with gusts to around 18 mph shifting to the northwest 10 to 15 mph with gusts up to 25 mph after 1400. Winds peak between 1700-1900. Ridgetop wind.......West winds 6 to 12 mph with gusts to around 22 mph shifting to the northwest 12 to 18 mph with gusts up to 28 mph after 1400. Winds peak between 1700-1900. Mixing height.......4700 ft AGL. Transport winds.....West 9 to 16 mph shifting to the northwest around 17 mph late in the afternoon. Ventilation Index...Low (60-70) increasing to moderate (480-490) in the afternoon. TIME (PDT) 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM 6PM 7PM Chc of ltng (%).0 0 0 0 0 0 0 0 0 0 0 0 Temp............61 65 71 75 79 82 85 85 85 85 84 80 RH..............57 49 41 35 30 25 23 22 22 23 25 27 20 FT wind dir..W W W W W W NW NW NW NW NW NW 20 FT wind spd..7 7 8 9 9 9 10 11 12 13 14 13 20 FT wind gust.10 11 13 14 15 16 18 20 21 22 23 23 .TONIGHT... Sky/weather.........Clear (0-10 percent). Patchy smoke. CWR.................0 percent. Chance of lightning.0 percent. Min temperature.....54-57. Max humidity........56-61 percent. Wind (20 ft)........Northwest winds 10 to 15 mph with gusts to up to 25 mph decreasing to around 5 mph after 2200. Ridgetop wind.......Northwest winds 12 to 18 mph with gusts up to 28 mph decreasing to around 5 mph after 2200. Mixing height.......500 ft AGL in the evening and overnight. Transport winds.....Northwest 16 to 17 mph becoming west 6 to 7 mph late in the evening, then shifting to the south around 5 mph early in the morning. Ventilation Index...Moderate (300-310) decreasing to low (30) overnight. .SUNDAY... Sky/weather.........Sunny (15-25 percent). CWR.................0 percent. Chance of lightning.0 percent. Max temperature.....86-91. Min humidity........14-19 percent. Wind (20 ft)........Light terrain driven winds, shifting to the north 5 to 10 mph after 1400. Winds peak between 1700-1900. Ridgetop wind.......Light terrain driven winds, shifting to the north 7 to 13 mph after 1400. Winds peak between 1700-1900. Mixing height.......4900 ft AGL early in the morning. Transport winds.....Southwest around 5 mph shifting to the north late in the afternoon. Ventilation Index...Low (30-40) increasing to moderate (250-270) in the afternoon. $$ Forecaster...Callihan Requested by...Matt Provencher Type of request...WILDFIRE .TAG 2617663.0/PDT .DELDT 07/18/26 .FormatterVersion 2.0.0 .EMAIL matt_provencher@firenet.gov