Fire and Aviation Discussion for Libby, Montana

Fire Weather Discussion as of 8:35 p.m. MDT Tuesday, August 5, 2025

Mild and dry conditions will prevail overnight with a slow but steady moistening and cooling of the airmass throughout the day on Wednesday. Overnight relative humidity recoveries will be good to excellent on valley floors and fair to moderate in thermal belts on slopes, hillsides and across higher terrain. During the day on Wednesday increasing clouds along with some increase in south to southwest breezes will occur with cooler conditions and a few showers by late afternoon along the Idaho border. Minimum relative humidity values will likely fall between 25-35% in the late morning into the early afternoon hours before increasing by later in the day as further cooling and moistening of the airmass continues. By Wednesday night a few showers and possibly thunderstorms will move through a cool and moist environment. Fire weather concerns will be greatly diminished by Wednesday night into Thursday with fire activity likely calming considerably.

Aviation discussion as of 8:40 p.m. MDT Tuesday, August 5, 2025 valid through 10:00 p.m. MDT Wednesday, August 6, 2025:

VFR conditions will prevail through the period with increasing mid and high level clouds starting around 11,000 feet ASL and gradually lowering by late Wednesday with ceilings down to around 8,500 to 9,000 feet by evening. A few showers will be possible mainly over and west of the Cabinet Mountains by late in the day. Winds will be south to southwest at 10 to 15 mph with local gusts up to 20 mph in the valley. Ridge top winds could gust up to 25 to 30 mph.