While severe weather is no longer a concern from Oklahoma City to St. Louis, the danger is now centering on cities from Toledo to Waco with another zone from Chicago to Green Bay through this evening.
The weekend has already started with flash flooding and damaging thunderstorm winds from western Kentucky to Arkansas.
A gusty thunderstorm near Royal, Ark., downed large trees earlier Saturday, while Paducah, Ky., endured widespread flooding problems as the city has received more than 5 inches of rain so far today.
Additional rain through this evening across Arkansas and the far western Ohio Valley could worsen or lead to more flash flooding incidents as the rain fails to seep into the already saturated ground.
There could also be flash flooding from the thunderstorms that rumble from Toledo, Ohio, to Waco and San Angelo, Texas, through tonight.
The strongest thunderstorms within this corridor will also be capable of producing damaging winds, hail and frequent lightning. A tornado or two touching down and causing destruction cannot be ruled out.
Other cities within the severe weather threat zone include Columbus and Dayton, Ohio, Cincinnati and Bowling Green, Ky., Nashville, Tenn., Shreveport, La., and Tyler and Waco, Texas.
Some communities can be hit hard with power outages, downed trees, flooding and property damage.
A separate area at risk for damaging winds and hail from thunderstorms through early this evening extends from Green Bay, Wis., to Chicago, Ill.
The severe weather danger will shift on Sunday to the Northeast and northern mid-Atlantic, including the I-95 corridor from New York City to Washington, D.C. Flooding downpours and damaging winds are the greatest concerns during the afternoon and evening hours.
Drenching thunderstorms will also extend southward along the spine of the Appalachians to close out the weekend.
The storms and the front that follows will mark an end to the buildup of heat and humidity in the Ohio Valley, Great Lakes and the East.
Please keep an eye out for rapidly changing weather conditions this weekend. The majority of the thunderstorms will occur between 2:00 p.m. and 10:00 p.m. However, there will be some exceptions.
If you can hear thunder and are outdoors, you are at risk for being struck by lightning. Move indoors, away from windows. Golf carts and picnic pavilions do not offer adequate protection from lightning. If you can only seek shelter in your vehicle, move to an area away from trees. Avoid setting up camp along small streams, which can rapidly rise during downpours. Don't drive through flooded roadways. By doing so you are not only putting yourself and occupants at risk, but also your would-be rescuers.
AccuWeather.com Senior Meteorologist Kristina Pydynowski contributed to the content of this story.
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