WINTER WEATHER ADVISORY until 9 am Saturday from Seeley Lake south to Sula and east to Bozeman and Great Falls. This includes the Butte area. 1 to 4 inches of snow are possible in the valleys with 4 to 8 inches in the mountains.

A cold front will move through the region tonight. In advance of it, a few thunderstorms are possible this evening from Missoula south and east to Butte and Bozeman. Rain showers will overspread the region tonight. As colder air spills into the region, the rain will change to snow. Accumulating snow is possible from Missoula south and east to Butte and Bozeman. Missoula may receive 1 to 2 inches, with up to 3 inches in Butte and Bozeman. Little accumulation is expected around Kalispell.

A ridge of high pressure will build into the region, replacing the trough of low pressure on Sunday. This means a big warming trend, beginning Sunday. Highs only in the 40s and 50s Saturday, warming to the 50s to around 60 Sunday, the 60s to around 70 Monday and the 70s Tuesday and Wednesday. We should also see some sunshine late Sunday through Tuesday.

The moon will officially become full Saturday (May 5), and because this month's full moon coincides with the moon's perigee - its closest approach to Earth - it will also be the year's biggest.

For a more detailed forecast please click here to visit our First Alert Weather page.