Storm-battered Oklahomans again faced the risk of severe thunderstorms and even tornadoes on Tuesday as another storm system moved through the Plains and the Mississippi Valley, forecasters said.

Weather Channel meteorologist Kevin Roth said that isolated tornadoes were possible, along with damaging wind gusts and hail.

Severe thunderstorms were possible in the east and south Plains and the Mississippi Valley on Tuesday and the south Plains and north Texas on Wednesday, Roth said.

“Hard-hit Oklahoma has the severe threat both Tuesday and Wednesday,” he added.

He said there was a tornado risk for Oklahoma City late afternoon and evening on Tuesday.

“Strong thunderstorms” were also expected to hit Kansas City on Tuesday afternoon.

Millions of Americans were in the path of a major storm on Sunday that caused flash flooding and devastation throughout the middle of the country, The Weather Channel's Chris Warren reports.

The National Weather Service published a map showing a large swath of the central and eastern U.S. at risk of thunderstorms and parts of Texas, Oklahoma, New Mexico, Arkansas, Kansas and Missouri had a slight risk of severe storms.

“Primary threats will be large to very large hail and damaging wind gusts. Isolated tornadoes will also be possible,” the weather service said.

Residents of West Alton, Mo. were ordered to evacuate the town after a levee breach near Highway 67 that sent water gushing over the roadway, Fire Chief Richard Pender told NBC News affiliate KSDK.

A flash-flood warning was in effect for parts of McClain, Grady, and Cleveland counties in Oklahoma until 7:15 am local time, the National Weather Service reported, as heavy rainfall was expected to move through the area.

The nation's midsection has been battered by relentless storms in recent weeks. On Friday, severe weather began to sweep across through the region, leaving 21 dead from twisters, hailstorms and flash floods - most of them in Oklahoma and Missouri.

And on May 20, an EF5 tornado packing 210mph winds struck the Oklahoma City suburb of Moore, killing 23 including 7 children who died at an elementary school.

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