the.com/flash flood

Nature's reminder that a peaceful creek can become a freight train in minutes

means A sudden, violent flood that rises with little warning, usually triggered by intense rainfall over a short period or by a dam or levee failure.

from A transparent compound of two old Germanic-rooted words. 'Flash' once meant a sudden burst or splash of water before it ever meant light — its earliest senses, dating back centuries, were about water dashing or rushing. 'Flood' comes from Old English 'flod,' related to the verb 'flow' and a whole family of Germanic water-words. So 'flash flood' is literally a 'sudden-rush flood,' a phrase that grew naturally as English needed a name for water that arrives all at once rather than creeping.

speed
Walls of water move up to 30 mph
deadly depth
Six inches can knock a person down
car killer
Two feet floats most vehicles away
desert danger
Dry canyons flood from storms miles upstream
timing
Can strike within minutes of heavy rain
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