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COVER Hurricane Mitch on 28 October 1998. Mitch, responsible for more than 9000 deaths in Central America, was one of 23 major hurricanes to develop in the Atlantic basin since 1995. This recent increase in activity is due to changes in tropical North Atlantic sea surface temperatures and atmospheric vertical shear, creating conditions more conducive to hurricane formation. These conditions are expected to continue for another decade or more. 474 [Satellite- derived image: NOAA; H. F. Pierce and A. F. Hasler, NASA]

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Science. ISSN 0036-8075 (print), 1095-9203 (online)