A storm system that brought severe weather and flash flooding to parts of the Southern Plains and South this week will continue to shift off to the north and east on Thursday, impacting parts of the Gulf Coast, the Tennessee and Ohio Valleys and the Great Lakes.
Flash flooding is also a possibility on Thursday, with the highest threat focused along the Gulf Coast from southeastern Louisiana to the Florida Panhandle. The flooding risk also stretches across areas of the Southeast, the Tennessee and Ohio Valleys and locations near the Great Lakes.
Cities with the highest risk of flooding include Mobile, Alabama and Tallahassee, Florida.
Flash flooding is also likely in Montgomery, Alabama, Atlanta and Greenville, South Carolina.
And while cities from Nashville to Indianapolis, Cleveland and Chicago will also be at risk of flooding on Thursday, the threat is much lower than that in the South.
Several inches of rain are expected to fall across the eastern half of the United States through at least Saturday.
However, areas that will likely see the highest totals will be found in the Southeast. Some areas of northeastern Georgia and western parts of the Carolinas could see upward of 5 inches of rain.
Severe storm threat
Millions of Americans are at risk of seeing severe weather on Thursday.
However, areas where severe thunderstorms are likely include eastern Alabama, the Florida Panhandle and northwestern Georgia, as well as points to the north into the Tennessee and Ohio Valleys and along the Great Lakes.
Several major cities are under the threat, including Chicago and Columbus, Louisville, Kentucky and Nashville.
Huntsville and Montgomery, Alabama are also included in that threat, as well as Atlanta.
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Tornados, large hail and wind are the threats accompanying any severe thunderstorms that develop on Thursday.
Tornadoes are possible from Mobile, Alabama and into the Southeast, including the Atlanta area and parts of the Tennessee and Ohio Valleys.
Large hail could also be an issue in parts of the Great Lakes and Ohio Valley, including the cities of Chicago, Louisville, Kentucky.
The threat of damaging winds extends from Chicago and the Great Lakes region, as well as to the south into the Ohio and Tennessee Valleys and the Southeast and Gulf Coast.
The threat of severe weather will move to the East Coast on Friday, with millions of people at risk of damaging winds, large hail and a possible tornado.
While severe weather is possible from Georgia to northern New England, the highest risk will be centered from South Carolina, including Charleston and Myrtle Beach, through the mid-Atlantic and parts of the Northeast.
This means people in Washington, D.C., Philadelphia, and the New York City metro should keep an eye on the sky.
There's also a threat of severe this weekend across the Plains and parts of the Midwest.
The threat will primarily be focused in the Central and Northern Plains, as well as parts of the upper Midwest.
Severe storms on Saturday are likely in northern Nebraska, southeastern South Dakota and southwestern Minnesota.
There's a higher risk of severe weather on Sunday across the same region.
Severe weather is possible from east-central Nebraska into eastern South Dakota, southeastern North Dakota, and all of Minnesota as well as parts of northwestern Iowa and northwestern Wisconsin.
Storms are very likely from areas near Sioux City, Iowa, Sioux Falls, South Dakota and creeping close to the Minneapolis-St. Paul area.
That region could see a third day of severe weather on Memorial Day, with that threat stretching from Dodge City, Kansas into Omaha, Nebraska, Minneapolis and Duluth, Minnesota.