What is a flash flood?
A flash flood is sudden flooding that appears and travels very quickly, with little to no warning that it is coming.
Flash floods usually occur when a heavy storm drops a lot of rain in a short amount of time and over a fairly small area.
They can turn a gentle river into raging water that can knock over almost anything in its path.
In narrow canyons and valleys, flood waters flow faster than on flatter ground and can be quite destructive.
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