A large storm system has moved into the Pacific northwest. It will sit there and eject moisture and energy into western Montana. This will bring clouds and increasing showers and thunderstorms to the region, mainly west of the divide tonight and area wide on Wednesday. The most widespread rain will fall across northwest Montana. Periodic showers and storms will continue Thursday and Friday. Rainfall the next few days may reach an inch to an inch and a half in the Flathead Valley, Glacier Park and the west slopes of the divide. Elsewhere, a quarter up to one inch is possible.
A surface cold front will move into the region, lowering highs to the 50s on Wednesday in Kalispell and the lower 60s in Missoula. In advance of the front, highs will reach near 70 in Bozeman. Highs in the 50s and 60s Thursday and Friday.