Threatening millions of people throughout the central United States and along the Atlantic coast, severe weather will move northeastward and spread over the Missouri and Mississippi valleys Thursday.
Thunderstorms, damaging winds, flash flooding and even isolated tornadoes are all threats that this storm system will bring.
The storms will stretch from Louisiana, Mississippi and Alabama to Illinois, Indiana and Ohio, as well as some of lower Michigan.
Flight delays are likely throughout the region, including some of the U.S.'s major cities in the path of the storm including, Kansas City, St. Louis, Indianapolis, Cincinnati, Nashville, Memphis, Little Rock, Ark., Louisville, Ky., Jackson, Miss., and Monroe, La.
Into Friday, the storm will move eastward threatening areas along the Atlantic coast, from the Delmarva Peninsula down to Raleigh, N.C., Charleston, S.C., and Jacksonville, Fla.
For the full story on the severe storms, read here.
UPDATES: (All times are listed in EST)
4:30 p.m. EST Thursday: At least 2,000 Iowa customers are without power, various utilities report. They include: 1,147 Alliant Energy; 929 Mid American Energy; and 118 members of Iowa electric cooperatives.
4:25 p.m. EST Thursday: It looks as if the best chance for a strong gusty t-storm in Chicago will be between 5 and 8 p.m., local time, AccuWeather.com Senior Meteorologist Dan Kottlowski said.
4:20 p.m. EST Thursday: Flooding reported at Fort Madison High School, Fort Madison, Iowa, NWS spotter said.
4:15 p.m. EST Thursday: Tornado touchdown near Arenzville, Ill., at 2:55 p.m., local time, emergency management reported.
4:10 p.m. EST Thursday: More than 3,500 electric customers in Missouri are without power: 1,730 http://apps.ameren.com/outage/outagemap.aspx?state=MO; 800 KCP&L; 615 Empire District; and 183 Co-Mo Electric Cooperative.
3:50 p.m. EST Thursday: For the most current updates on the severe weather, watch the latest edition of AccuWeather LIVE:
3:50 p.m. EST Thursday: Flooding with 1 foot of water reported between Altona and Oneida, Ill., NWS cooperative observer said.
3:45 p.m. EST Thursday: The brick storefront of an old, unoccupied store was blown down in Stephens, Ark., at around 1:30 p.m., local time, emergency management in Quachita County, Ark., reported to the National Weather Service.
3:40 p.m. EST Thursday: A broken line of gusty thunderstorms will cross St. Louis from west to east during the next two hours and be on top of the city around 3:30 p.m., local time, AccuWeather.com Meteorologist Erik Pindrock said.
3:30 p.m. EST Thursday: AccuWeather.com meteorologists are monitoring the possibility for a few tornadoes from southern Illinois and southern Indiana southward into northern Mississippi over the next several hours.
3:15 p.m. EST Thursday: 58 mph wind gust, three miles west-northwest of Hannibal, Mo., according to NWS observation.
3:10 p.m. EST Thursday: Rainy travel on Interstate 20 near Shreveport, La., where a line of thunderstorms passed through the area.
2:40 p.m. EST Thursday: Storms northwest of St. Louis moving toward west-central Illinois are showing signs of bowing, which may lead to high winds.
2:00 p.m. EST Thursday: Thunderstorms are beginning to fire up in northeastern Texas.