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Rare level 4 threat Monday — 1,000-mile outbreak zone

Meteorologists have issued a rare Level 4 out of 5 severe weather threat for Memorial Day itself — covering a 1,000-mile zone ...
AOL

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 ...