Flash floods, 'once in 200 years rainfall event' loom in South Carolina
+NBC News: About 22 million Americans are under flood watches early Saturday as an 'once in 200 years rainfall event' continues to drench South Carolina and eastern states in the US.
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'Once in 200 Years' Downpour Threatens Flash Flooding
Around 22 million Americans were under flood watches early Saturday as a "once every 200 years" rainfall event was drenching South Carolina.
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