Nighttime tornadoes are worst nightmare

(PhysOrg.com) -- A new study by Northern Illinois University scientists underscores the danger of nighttime tornadoes and suggests that warning systems that have led to overall declines in tornado death rates might not be adequate for overnight events, which occur most frequently in the nation's mid-South region.

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<p><a href="http://www.physorg.com/news145096467.html">Nighttime tornadoes are worst nightmare</a></p> <p>(PhysOrg.com) -- A new study by Northern Illinois University scientists underscores the danger of nighttime tornadoes and suggests that warning systems that have led to overall declines in tornado death rates might not be adequate for overnight events, which occur most frequently in the nation's mid-South region.</p>