FNUS76 KPDT 240103 FWSPDT Spot Forecast for Sandbox...Forest Service National Weather Service Pendleton OR Issued by National Weather Service Spokane WA 603 PM PDT Thu Oct 23 2025 Forecast is based on ignition time of 1900 PDT on October 23. ***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... Passing mid and high clouds tonight with mild temperatures and poor recoveries. Southeast winds increase on Friday ahead of an approaching cold front which is expected to pass through between 2000-2200 delivering a brief wind shift to the southwest along with gusty winds and rain. Winds could become northwest for a short period with the rain falling. A wetter system arrives Saturday with a similar wind shift around 1700. Temperatures will be crashing Saturday into Sunday with highs in the 30s by Sunday and chance for snow showers. Rainfall amounts for Friday night: 0.05 - 0.15". Rainfall amounts for Saturday: 0.30-0.50". Liquid equivalent for snow showers Sunday: 0.05-0.15" .TONIGHT... Sky/weather.........Partly cloudy (35-45 percent) then becoming mostly cloudy (60-70 percent). CWR.................0 percent. Chance of lightning.0 percent. Min temperature.....42-45. Max humidity........40-45 percent. Wind (20 ft)........Southeast winds 5 to 8 mph. Mixing height.......500 ft AGL early in the evening. Transport winds.....East around 11 mph. Ventilation Index...Poor (30). .FRIDAY... Sky/weather.........Mostly cloudy (65-75 percent). CWR.................0 percent. Chance of lightning.0 percent. Max temperature.....53-56. Min humidity........30-35 percent. Wind (20 ft)........Southeast winds 10 to 14 mph with gusts 20-25 mph. Mixing height.......1900 ft AGL between 1200-1300. Transport winds.....Southeast around 20 mph. Ventilation Index...Poor (70) increasing to fair to good (350) in the afternoon. .FRIDAY NIGHT... Sky/weather.........Cloudy (90-100 percent). Chance of rain in the evening, then rain overnight. CWR.................50 percent. Chance of lightning.2 percent. Min temperature.....40-42. Max humidity........92-97 percent. Wind (20 ft)........Southeast winds 8 to 14 mph gusts up to 25 mph becoming southwest 10-15 mph gusts 28 mph briefly 2000-2200 with frontal passage. Winds decreasing to south 5 to 10 mph after midnight. Mixing height.......1000 ft AGL early in the evening then 1100 ft AGL overnight. Transport winds.....Southwest around 15 mph becoming southeast . Ventilation Index...Poor (110) decreasing to poor (90) overnight. .SATURDAY... Sky/weather.........Cloudy (90-100 percent). Rain. CWR.................98 percent. Chance of lightning.10 percent. Max temperature.....41-44. Min humidity........74-79 percent. Wind (20 ft)........Southeast to south winds 8 to 13 mph gusts 25 mph shifting to the southwest around 1700 with similar speeds. Mixing height.......1800 ft AGL. Transport winds.....South around 18 mph becoming southwest 18 mph. Ventilation Index...Poor (140) increasing to fair (360) in the afternoon. .SUNDAY... Snow, showers likely. Lows in the upper 20s. Highs in the mid 30s. South to southeast winds 5 to 11 mph. $$ Forecaster...NWS Spokane Requested by...Scott Gallagher Type of request...PRESCRIBED .TAG 2524389.0/PDT .DELDT 10/23/25 .FormatterVersion 2.0.0 .EMAIL scott.gallagher@usda.gov