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The nation's weather

By WEATHER UNDERGROUND
The Associated Press
Wednesday, March 23, 2011; 4:47 AM

-- Two major systems will bring active weather to the nation Wednesday.

A low pressure system that has dumped heavy snow over the Intermountain West, Great Basin and Northern Rockies continues moving eastward from the Upper Midwest, over the Great Lakes and into New England. Snowfall accumulation is expected to range from 3 to 8 inches across western New York and Pennsylvania. The back side of this system will continue pulling cold air in from Canada, which will allow for a combination of snow and ice to develop across the Great Lakes. Expect 1 to 2 inches of snow and sleet accumulation in Wisconsin and Michigan. A warm front associated with this system will stretch along the Ohio River Valley. Since this will push warmer air in from the South, periods of heavy showers and thunderstorms may develop from the Mid-Mississippi River to the Virginias.

Meanwhile out West, another low pressure system spinning in the Pacific Ocean makes its way onshore Wednesday. This system pushes a strong cold front over northern California that will bring more heavy rain to the state, with heavy snow in the Sierras. Expect 3 to 6 inches of snow, with up to 12 inches likely above 7,000 feet. Lighter rain and snow showers are expected across Oregon and Washington as this trough takes a more southern route.

Temperatures in the Lower 48 states Tuesday ranged from a morning low of 10 degrees at Mt. Washington, N.H., to a high of 90 degrees at Laredo, Texas.

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Online:

Weather Underground:http://www.wunderground.com

National Weather Service:http://iwin.nws.noaa.gov

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