A low pressure system will bring major impacts to the East Coast on Wednesday, while a ridge of high pressure builds over the West Coast.
A robust area of low pressure will transition northeastward from the lower Mississippi Valley to the eastern Great Lakes. Warm and moist air from the Gulf of Mexico will streak northward ahead of this system. As this system draws in this warm and muggy air, it will collide with a cold frontal boundary extending southward from the Tennessee Valley to the eastern Gulf Coast. The interaction will generate a line of strong to severe thunderstorms across northern Florida, eastern Georgia, South Carolina, North Carolina, eastern Virginia and southeast Maryland. These thunderstorms will be capable of producing large hail, dangerous straight line winds and isolated tornadoes. Heavy rain associated with these storms will also bring threats of flash flooding to southeast Indiana, Ohio, northern Kentucky, western South Carolina, western North Carolina, western Virginia, eastern West Virginia, western Maryland, northern New Jersey, southern New York and much of southern New England.
Cold air over the northern tier of the country will support heavy snow showers across eastern Illinois, northern Indiana, northwest Ohio and Michigan. A mixture of rain and freezing rain will affect Upstate New York and New England.
Meanwhile, a weak disturbance will shift across the north central portion of the country. A light mix of rain and snow will develop over portions of the northern Plains and the upper Mississippi Valley.
A quiet weather pattern will continue across the western third of the country on Wednesday.
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