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EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC PHENOMENA > CYCLONES
Definition:
A weather system charcterised by relatively low surface air pressure at a
given level and a closed cyclonic wind circulation. Also the regional name
for a severe tropical cyclone with sustained surface wind speeds greater
than 64 knots (74 mph) in the western South Pacific and Indian Oceans,
equivalent of a hurricane or typhoon. 
Reference:
Glossary of Weather and Climate, American Meteorological Society, 1996.
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