00:00NOAA's Storm Prediction Center has issued a Level 4 out of 5 severe weather risk for Indiana and Illinois,
00:07the second-highest warning level possible.
00:10Forecasters say powerful supercell thunderstorms are expected to develop,
00:14and some could produce violent EF3 or stronger tornadoes.
00:17These long-track tornadoes can stay on the ground for miles, causing catastrophic damage along their paths.
00:24National Weather Service survey teams were dispatched overnight to assess confirmed tornado damage
00:29across Iowa and Wisconsin.
00:31The broader severe weather outbreak stretches from Missouri to Ohio,
00:36placing tens of millions of Americans under threat.
00:39Officials urge residents to move to the lowest floor of a sturdy building,
00:44stay away from windows, and keep emergency supplies nearby.
00:47Continue monitoring NOAA weather alerts through the night.
00:51The tornado threat does not end at midnight.
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