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 As this system progresses, it will merge with another system dropping in from the
upper Great Lakes. Expect widely scattered showers with periods of heavy rain and thunderstorms to persist ahead of this system in the eastern Tennessee Valley, Ohio Valley,
central and northern Appalachians, and northern Mid-Atlantic.
Precipitation will change into a mix of rain, sleet, freezing rain and snow showers in the
northern Appalachians and the interior Northeast. Another area of low pressure trying to develop along the southern New England coast will enhance precipitation in these regions, allowing for heavy precipitation in the Northeast. Snow accumulations from this system are expected to reach up to 9 inches by the evening. Winter
weather advisories and winter storm warnings will remain in effect for much of the Northeast through Thursday night.
On the back of this system, blustery northwest wind will usher an arctic air mass over the
upper Midwest, allowing rain showers in the upper Great Lakes, mid-Mississippi Valley and western Ohio Valley to change over into snow showers. Expect 6-10 inches of accumulating snowfall in Wisconsin, about 3-6 inches in northern and central Illinois and Indiana, and light snow accumulations in Iowa, Missouri, southern Illinois and Kentucky.
Winter weather advisories and winter storm warnings will remain in effect for much of these states through Friday morning.
Elsewhere, high pressure will maintain generally dry weather conditions in the West.
Temperatures in the Lower 48 states Wednesday ranged from a morning low of
minus 19 degrees at Clayton Lake, Maine, to a high of 86 degrees at Gainesville, Fla.
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