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Destructive Severe Thunderstorm Warning: What is it?

The National Weather Service (NWS) says there are three threat categories when it comes to severe thunderstorms.
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Rare threat level 4/5 issued as dangerous severe weather outbreak threatens 180+ million in major threat zone

A widespread and significant severe weather outbreak is developing for over 180 million Americans, as destructive impacts start on Sunday afternoon in the Heartland and will last through Monday ...