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Term Definition
High Water Mark

A reference mark on a structure or natural object, indicating the maximum stage of tide or flood.

Historical Tsunami

A tsunami identified as having occurred through eyewitness or instrumental observation within the historical record.


An intense tropical cyclone in which winds tend to spiral inward toward a core of low pressure, with maximum surface wind velocities that equal or exceed 33.5 m/sec (75 mph or 65 knots) for several minutes or longer at some points. Tropical storm is the term applied if maximum winds are less than 33.5 m/sec but greater than a whole gale (63 mph or 55 knots). Term is used in the Atlantic, Gulf of Mexico, and eastern Pacific.

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