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Definition English:
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Generic term for a non-frontal synoptic scale cyclone originating over tropical or sub-tropical waters with organized convection and definite cyclonic surface wind circulation. Tropical Disturbance: light surface winds with indications of cyclonic circulation. Tropical Depression: wind speed up to 33 knots. Tropical Storm: maximum wind speed of 34 to 47 knots. Severe Tropical Storm: maximum wind speed of 48 to 63 knots. Hurricane: maximum wind speed of 64 knots or more. Typhoon: maximum wind speed of 64 knots or more. Tropical Cyclone: (South-West Indian Ocean): maximum wind speed of 34 to 90 knots. Tropical Cyclone (Bay of Bengal, Arabian Sea, South-East Indian Ocean, South Pacific): maximum wind speed of 34 knots or more (Material II - IDNDR, 1992); The australian term is Willy-Willy |