FNUS75 KBOI 121303 FWSBOI Spot Forecast for Boise Experimental Forest Machine Piles...USFS National Weather Service Boise ID 603 AM MST Fri Dec 12 2025 Forecast is based on ignition time of 0700 MST on December 12. If conditions become unrepresentative...contact the National Weather Service. Please contact our office at (208)334-9060, if you have questions or concerns with this forecast. ...AIR STAGNATION ADVISORY THROUGH MONDAY 0700 MST... ...WARM, DRY, AND STABLE THIS WEEKEND WITH COOLER AND WETTER CONDITIONS NEXT WEEK... .DISCUSSION... High pressure will bring an inversion over the region through Monday. Stable air will trap smoke and aid in overnight fog development due to low mixing heights and light winds in sheltered areas. Temperatures will remain above normal through Monday, with midslope and ridgetop temperatures remaining much higher with lower relative humidity than valley floors. A significant shift to a cool and wet pattern is anticipated next week. .REST OF TODAY... Sky/weather.........Partly cloudy. Patchy fog in the morning. Max temperature.....52 to 57. Min humidity........54 to 59 percent. CWR.................0 percent. Wind - 20 foot......Less than 3 mph. Mixing height.......2000 ft AGL. Transport winds.....West around 5 mph. Ventilation Index...100 poor. .TONIGHT... Sky/weather.........Mostly clear. Min temperature.....25 to 30. Max humidity........80 to 85 percent. CWR.................0 percent. Wind - 20 foot......Less than 3 mph. Mixing height.......300 ft AGL. Transport winds.....East around 5 mph. Ventilation Index...15 poor. .SATURDAY... Sky/weather.........Sunny. Max temperature.....51 to 56. Min humidity........48 to 53 percent. CWR.................0 percent. Wind - 20 foot......Less than 3 mph. Mixing height.......1000 ft AGL. Transport winds.....Southeast around 3 mph. Ventilation Index...30 poor. $$ Forecaster...Adams Requested by...Randy Lamb Type of request...PRESCRIBED .TAG 2527153.4/BOI .DELDT 12/12/25 .FormatterVersion 2.0.0 .EMAIL ralph.lamb@usda.gov