flash flood

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Mr Willetts is not the only writer to worry about baby-boomers crashing through society like a flash flood.
威利特斯先生不是唯一擔心嬰兒潮一代會像山洪暴發一樣沖擊社會的作家。
Tragically, the heavily traveled tourist route became the site of the worst natural disaster in Colorado’s history during a catastrophic flash flood in July 1976.
不幸的是，在1976年7月的一場特大洪水中，這條遊人如織的道路上發生了科羅拉多州歷史上最慘痛的自然災害。
The river was later replenished by a sudden flash flood.
之後，由於突然爆發的洪水，這條河再度恢複到較多的水量。

Mr Willetts is not the only writer to worry about baby-boomers crashing through society like a flash flood.
ECONOMIST: Social change
The heavy rains moving across the East Coast also raised flash flood fears and forced water rescues in Virginia and Maryland near the nation's capital.
NPR: 2 Dead After Storms Rake South, Take Aim At East
Despite the flash flood of news on the auto industry from Washington, several questions remain unresolved: What, exactly, are automakers supposed to include in their plans?
FORBES: Magazine Article

A flash flood is a sudden rush of water over dry land, usually caused by a great deal of rain.