WINTER STORM WARNING is posted for the northern Rocky Mountain Front above 6000 feet with a WINTER STORM WATCH posted for the west side of the park. Snowfall of 10 to 20 inches will be possible.

WINTER WEATHER ADVISORY has been posted for the Butte and Blackfoot Regions. Snowfall of 1 to 2 inches will be possible at Homestake and MacDonald Passes and Georgetown Lake.  Snowfall of 2 to 4 inches is possible at Lost Trail and Chief Joseph Passes.  

A slow moving storm system will bring periods of valley rain and drizzle to the region through Wednesday.  Locally heavy rain will be possible across northwest Montana on today.  This would include the Kalispell area and heavy snow will be possible in Glacier National Park.  Missoula has a good chance of rain today through Wednesday. Bozeman and Butte have the best chance this morning, with a break late this afternoon into early Wednesday before rain increases again by Wednesday afternoon.

Rainfall amounts will be impressive with this storm.  Most of western Montana has the potential of at least a half to one inch of rain.  Areas along the divide north to Glacier Park and across northwest Montana have the potential of seeing 1 to 2 inches of rain, with locally higher amounts around Glacier Park where 3 to 4 inches of liquid, in the form of rain and snow, will be possible.  At this point, no major flooding is expected.  However, we will keep an eye on it here at First Alert Weather.

Temperatures will be quite chilly for mid June.  Highs only in the 40s and 50s with lows in the 30s and 40s.  Warmer temperatures are expected by the end of the week and next weekend.