Weather Underground Forecast for Monday, March 12, 2012. More wet weather is in store for parts of the Northwest on Monday. Coastal and valley rain showers and high elevation snowfall from Sunday's frontal system are expected to taper down through Monday morning. As this precipitation decreases, another cold front from the Pacific will approach the Pacific Northwest, bringing another shot of rain to the Pacific Northwest coast and valleys, high elevation snow the Cascades and Northern Rockies, showers to northern California, and snow to the northern Sierra Nevadas. This precipitation will continue and spread into Central California through Tuesday.
In the East, precipitation will continue will spread into the Upper Midwest and Upper Great Lakes as the low pressure system in the Central Plains lifts northeastward through the Midwest. Showers, periods of heavy rain, and thunderstorms will form along and ahead of it 1/4's associated cold front as it pushes eastward through the Eastern Valleys and draws up ample moisture from the Gulf of Mexico. There is a slight risk for severe weather development from northeastern Illinois into much of lower Michigan. The main concerns with these storms are large hail and tornadoes. Temperatures in the Lower 48 states Sunday have ranged from a morning low of 1 degrees at West Yellowstone, Mont. to a high of 84 degrees at Fort Myers, Fla.