The nation’s weather

Weather Underground Forecast for Sunday, March 31, 2013.

Rain and snow showers continue for the Great Lakes, while showers and thunderstorms move into the Eastern Valleys on Sunday. As a low pressure system continues moving northeastward and over the Great Lakes on Sunday, the system will push a trough of low pressure eastward from the center of the nation and into the Eastern States. Flow around this system will also produce two cold fronts, which will bring active weather into the East. The first cold front will extend from the Ohio River Valley and through the Tennessee Valley, wrapping around westward over the Southeast and into the Southern Plains. As this system moves southeastward throughout the day, moisture feeding into this system from the Gulf of Mexico will allow for showers and thunderstorms to develop along this frontal boundary. Some of these storms may turn severe with strong winds and large hail. The second cold front will extend across the Upper Midwest and move through the Upper Mississippi River Valley, bringing cooler air in from Canada. This will allow for snow showers to develop in these areas as high temperatures will return to the freezing mark.

Meanwhile, out West, a low pressure system off the West Coast advances onshore on Sunday, bringing scattered showers to most of California and Nevada. Warmer temperatures are associated with this system, thus, snow levels for the Sierra Nevadas will remain high, over 8,000 feet. Thus, snow is only expected at highest mountain peaks. Throughout the day, rain showers from this system will stretch into Oregon and eastward into the Great Basin.

Temperatures in the Lower 48 states Saturday have ranged from a morning low of 12 degrees at Minot, N.D. to a high of 82 degrees at Harlingen, Texas

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