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Thursday
Jan262017

Inversions returning to Western MT valleys 

(MISSOULA)- The fresh air was nice while it lasted. 

However, the return of a ridge of high pressure is already bringing a return of inversions to the valleys of Western Montana. 

Inversions are created in the Northern Rockies when warmer air is present at higher elevations, trapping colder air, and particulates from wood stoves and other sources at the surface. There have already been several episodes where air quality dropped this winter, and forecasters are expecting those conditions to return going into this weekend. 

The Missoula, Bitterroot, Mission, Flathead and Helena valleys are especially susceptible to these developing conditions. Montana DEQ reports most air quality was still "moderate" as of Thursday morning, although Seeley Lake had already seen some readings in the "unhealthy" range, which causes problems for people with repiratory conditions.  

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