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Tropical storms may not seem as dramatic as hurricanes, but they are equally as dangerous when it comes to floods.
A tropical storm sometimes stalls over an area, creating a train of storms that pick up the moisture from the Gulf and dump that water in the same spot for many hours.
This very heavy rain can cause disastrous floods. A recent example is Tropical Storm Allison, which dropped up to 36 inches of rain on the east side of Houston.