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The storms that extend from Texas to southern Minnesota are expected to spread Sunday in the Great Lakes region and the Ohio Valley, the center of the Atlantic coastline and the central Appalachians North.
Although the risk of heavy storms seems to be low, it spreads over a large population.
Those in the Chicago area are preparing for scattered, fast-moving thunderstorms that can generate high winds and hail, according to the National Weather Service.
And if these storms look like Saturday, they could cause destruction.
tornadoes
At least 34 tornadoes have been reported since Friday morning, including Kansas, Nebraska and Texas. On Saturday, 10 tornadoes were reported, as well as 148 wind reports and 33 hail reports.
This is the peak of the tornado season, said CNN meteorologist Derek Van Dam, "with an average of 268 tornadoes nationwide during the month of May".
Flood
The threat of flooding will be strong throughout the week, with rainfall ranging from one to five inches, according to Van Dam.
"Heavy rains will have an impact on areas that have received a significant amount of rain in recent weeks," said Van Dam. "The soil remains very saturated and can raise the threat of flooding."
Missouri is expected to receive heavy rainfall on recently saturated soils and may have increased flood potential, according to the NWS.
The Mississippi River is above flood level for 133 consecutive days in Natchez, 90 days and Vicksburg and 89 in Greenville, said the NWS, breaking the longest flood record of recent years.
The biggest threat coming later this week
Monday will see the greatest risk of severe weather, said Van Dam, while a cold front is moving from the west to the plains.
An increased risk of extreme weather (level three out of five) spreads in southern Kansas, Oklahoma and central Texas.
But the Panhandle of Texas and central Oklahoma will see a moderate risk of four out of five.
"In fact, Tornado Alley will be alive again early next week, in fact, the fact that the SPC has a moderate risk so far in advance of a possible bad weather outbreak actually indicates its level of confidence in an important event. "said Van Dam," he said.
Derek Van Dam and Theresa Waldrop of CNN contributed to this report.
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