MISSOULA — We started out very chilly Wednesday morning, and temperatures have not been allowed to rise much since.
Inversions have started forming over valleys, and cooler air will be trapped near the surface.
Temperatures will remain below average due to these inversions for the rest of the week.
Highs will likely be in the mid to upper 20s and low 30s.
Lows will continue dropping to the mid to low teens, so there are some cold nights and chilly mornings ahead of us.
Air quality is also likely to be degraded through the weekend.
These inversions not only trap cooler air at the surface, but air is not mixing out of valley floors.
Stagnant air mixed with pollutants get trapped under these layers, and degraded air quality is likely.
Air Stagnation Advisories remain in play for some parts of Western Montana, but we will be watching valleys as air quality fluctuates through the end of the weekend.