El Nina they call it. She was here last year, and it appears she's returning for another visit.
Over at makeitmissoula.com Paul Queneau has a post about the storm arriving tonight.
He writes: "Late tonight, a powerful cold front will sweep across western Montana. By noon Saturday, National Weather Service forecasters predict six to ten inches of snow will drape the mountain passes around Missoula, along with winds that could gust as high as 40 mph."