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2) A severe depression (region of very low atmospheric pressure) in tropical regions, called typhoon in the North Pacific. It is a revolving storm originating at latitudes between 5° and 20° north or south of the Equator, when the surface temperature of the ocean is above 27°C/80°F . A central calm area, called the eye, is surrounded by inwardly spiralling winds (anticlockwise in the northern hemisphere and clockwise in the southern hemisphere) of up to 320 kph/200 mph. A hurricane is accompanied by lightning and torrential rain, and can cause extensive damage. In meteorology, a hurricane is a wind of force 12 or more on the Beaufort scale.
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