Severe weather will lash through areas from the Plains to the Midwest Monday into Tuesday, hitting some of the major cities in the United States, including Chicago; St. Louis; Des Moines, Iowa; and Kansas City.
Violent thunderstorms could erupt with tornadoes, damaging winds, large hail and flooding in many areas.
Strong storms can cause property damage, put lives in danger and impact travel across central U.S.
"The danger should transition into more of a widespread damaging wind threat for areas farther east and south into Illinois, Missouri, northern Indiana and southwestern Michigan through Monday evening," AccuWeather.com Meteorologist Frank Strait said.
Most of the potential damage is expected for Monday as storms should weaken as they move east toward Ohio and stretch down to parts of Oklahoma and Texas.
UPDATES: (All times are listed in CDT)
10:35 a.m. CDT Monday: Grapefruit-sized hail now reported by NWS-trained spotter in Rockwell City, Iowa.
10:20 a.m. CDT Monday:
Hail in Harlan, IA this morning. @RustyLord pic.twitter.com/xzg2VUqJFg— Carmen Nelson (@nelson_carmen) June 30, 2014
9:55 a.m. CDT Monday: Hail measuring 2 inches in diameter, about the size of a hen egg, has been reported by an emergency manager in Harlan, Iowa.
9:45 a.m. CDT Monday: According to the FAA, Chicago's O'Hare International Airport is experiencing gate hold and taxi delays as a result of the stormy weather in the Midwest.
9:25 a.m. CDT Monday:
Tornado threat across Thurston, northern Cuming county & northern Burt counties has diminished. Large hail and strong wind still possible.— NWS Omaha (@NWSOmaha) June 30, 2014
9:15 a.m. CDT Monday: Law enforcement in Wayne County, Nebraska, reports gold ball sized hail.
8:55 a.m. CDT Monday: A 911 call center reports flash flooding in Rhea County, Tennessee.
8:30 a.m. CDT Monday: Law enforcement in Pierce County, Nebraska, report a brief funnel cloud in the area.
8:15 a.m. CDT Monday: Benton County, Iowa, has received 2.75 inches of heavy rain so far, according to an NWS spotter.