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[March 21, 2011] (AP) The large trough of low pressure that brought significant wet weather activity to California this past weekend will trek slowly to the east Monday.

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Waves of energy associated with this disturbance will spread into the Pacific Northwest and the Great Basin. While these disturbances will be somewhat weaker than the previous day, widely scattered precipitation is expected to accompany these systems. Precipitation totals are not expected to be as heavy as they were in California on Sunday, due to the lack of moisture reaching the western interior. Meanwhile, the cold, unstable air mass of the region will continue the threat of showers back near the West Coast.

As the system of the West heads East, precipitation over the central U.S. will shift toward the East Coast on Monday. A low pressure system in the Midwest will move into the upper Great Lakes, bringing moderate rain showers and chances of thunderstorms to the Great Lakes, northern Mid-Atlantic, and parts of the Northeast and southern New England areas. Colder temperatures in the Upper Peninsula may support snow shower development during the early morning.

By Monday night, a slight risk of severe thunderstorms with damaging wind and hail will be possible in parts of the mid-Missouri Valley into central Iowa.

Temperatures in the Lower 48 states Sunday ranged from a morning low of minus 6 degrees at Yellowstone, Wyo., to a high of 96 degrees at Lake Charles, La.

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[Associated Press article from Weather Underground]