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A tropical cyclone is a non-frontal, warm-cored low pressure system with a well-defined center of circulation. While known as tropical cyclones in most of the southern hemisphere (except for the South Atlantic), tropical cyclones with winds in excess of 64 knots (74 mph) are known as hurricanes in the Atlantic and Eastern Pacific, and typhoons in the Western Pacific.
The world's strongest tropical cyclone, by pressure, is Typhoon Tip of the 1979 Pacific typhoon season, which had a pressure of 870 mbar. The strongest tropical cyclone by wind speed, and the strongest tropical cyclone in the Western Hemisphere, is Hurricane Patricia of the 2015 Pacific hurricane season, which had maximum sustained winds estimated as high as 215 mph.