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By Tim Stelloh

Millions were preparing across the Plains on Sunday for a blast of powerful thunderstorms, possible tornadoes and large hail.

The National Weather Service's forecast map for Tuesday shows the potential for flash floods in the Plains and the Midwest.National Weather Service

And this is just the beginning, according to The Weather Channel: More potentially dangerous rain, wind and twisters are expected across the region and beyond through Friday.

In Kansas, a tornado was seen about 100 miles east of Topeka, The Weather Channel reported, while video shot northwest of Wichita captured what appeared to be the ominous gray column of a funnel cloud, according to NBC station KSN.

Photos published by the station showed hail that was nearly twice the size of a quarter.

Tornadoes were also spotted to the north, in southern Nebraska, The Weather Channel reported.

The National Oceanic and Atmospheric Administration issued severe thunderstorm watches from Iowa and Kansas to South Dakota and Minnesota, where large hail and wind gusts as powerful as 75 mph were possible.

Beginning Monday, severe weather is expected to move into Illinois and Michigan, and on Tuesday night, tornadoes and powerful storms may "explode" in parts of Nebraska, Kansas, Oklahoma, Texas and Arkansas, said Greg Forbes, severe weather expert for The Weather Channel.

On Wednesday, Forbes said, a "severe thunderstorm and limited tornado outbreak" is expected in parts of Missouri, Iowa, Illinois, Kentucky, Arkansas and Louisiana.

More thunderstorms are forecast for Thursday and Friday, when heavy rains and powerful winds could strike west Texas, the Tennessee Valley, parts of Colorado and the eastern Midwest, Forbes said.