Tropical Cyclone (TC)
Tropical Cyclone (TC) : Generic term for a non-frontal synoptic scale cyclone originating over tropical or sub-tropical waters with organised convection and definite cyclonic surface wind circulation including: (1) tropical disturbance: light surface winds with indications of cyclonic circulation; (2) tropical depression: wind speed up to 33 knots; (3) tropical storm: maximum wind speed of 34 to 47 knots; (4) severe tropical storm: maximum wind speed of 48 to 63 knots; (5) hurricane: maximum wind speed of 64 knots or more; (6) typhoon: maximum wind speed of 64 knots or more; (7) tropical cyclone (South-West Indian Ocean): maximum wind speed 64 to 90 knots; (8) tropical cyclone (Bay of Bengal, Arabian sea, South-East Indian Ocean, South Pacific): maximum wind speed of 34 knots or more
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