Meteorology and Weather
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Rain and Flooding

What causes a flash flood?

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Answered 2010-06-15 19:46:03
Flash FloodA flash flood is caused by excess water, usually from a storm. This usually happens downstream from the storm as heavy rains produce more water than the area can handle with nothing to impede its buildup or soak it into the ground.

As a weatherman in Oklahoma recently put it: "It is when a large rain and storm system hovers an area and does 'not leave' or 'move on' (as generally seen with systems) but instead stays, dumping supernatural amounts of water in a "flash," overwhelming even the more extraordinary and multi-competant drainage and levy systems."

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