The massive anticlockwise swirl of cloud associated with Typhoon Yuri, photographed by the crew of Shuttle Mission STS-44 at the end of November 1991. Typhoon Yuri originated about 1,500km east of the Philippine Islands in the Pacific Ocean. At this point, the cloud deck is some 1,700km in diameter, with the calm and almost cloudless 'eye' of the storm seen at centre. Wind speeds on the ground were often measured at a sustained 230km per hour, with gusts reaching 270km per hour. Typhoons, or tropical cyclones, develop over ocean areas at least 5 degrees latitude above the equator and where the surface water temperature is over 27 Celsius.

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