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The three-day event will cover approximately 1,400 miles, including parts of the southeastern and mid-Atlantic littoral that have been severely impacted by severe storms over the weekend. .
As the system heads east, some areas in the southeast may face extreme weather on Thursday, with much of the east coast on the runway to feel the impacts on Friday.
The storms are expected to begin Wednesday in the center of the country, with the largest threat extending from south-central Texas to southern Kansas.
Large hail and isolated tornadoes preoccupy places like Dallas, Austin, Texas and Oklahoma City.
According to the National Meteorological Service's Storm Prediction Center, these areas are already facing an "increased risk" of violent storms – the third of five levels of risk -.
The storms, which should be organized Wednesday afternoon in the southern plains, will become widespread later in the evening and into the night.
The biggest concern is the significant hail potential, up to 2 inches or more in diameter. Strong winds are also possible, as well as the risk of some tornadoes.
Beyond the "increased risk" zone, a "mild risk" (level 2 out of 5) of violent storms extends from the Mexico-Texas border to Iowa. This includes the densely populated areas around San Antonio; Tulsa, Oklahoma, Kansas City; Wichita, Kansas; and Shreveport, Louisiana.
So the serious threat is moving into the great south
As the system moves east, the threat of severe weather will persist.
Louisiana and Mississippi will be in danger on Thursday morning, and storms will move Thursday afternoon in Alabama and Georgia. The Great South is facing a "slight risk" (level 2 out of 5) of violent storms, announced the Storm Prediction Center.
The cities at risk include Baton Rouge and New Orleans, Louisiana; Mobile, Birmingham and Montgomery, Alabama; and Memphis and Nashville, Tennessee.
The storms should continue all night, with the potential for high winds and possibly tornado.
The danger is ultimately on the east coast
On Friday morning, thunderstorms will approach the Atlantic coastal states, offering a potential for severe weather from Florida to Washington.
The risk will be partially mitigated by heavy precipitation associated with the extended system, but the conditions should still allow some storms to intensify.
The threat should diminish during the night when the cold front associated with powerful thunderstorms will eventually push the coast.
CNN meteorologist Dave Hennen contributed to this report.
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