Study: Tropical cyclones migrating out of tropics

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Associated Press

Posted on May 14, 2014 at 12:07 PM

Updated Wednesday, May 14 at 12:08 PM

WASHINGTON (AP) — A surprising new study finds that tropical cyclones worldwide are moving out of the tropics toward the poles and generally larger populations, likely because of global warming.

Atlantic hurricanes, however, don't follow this trend.

While other studies have looked at the strength and frequency of the storms, which are called hurricanes in North America, this is the first study that looks at where they are geographically when they peak. It found in the last 30 years, tropical cyclones, regardless of their size, are peaking 33 miles farther north each decade in the Northern Hemisphere and 38 miles farther south each decade in the Southern Hemisphere.

That means about 100 miles toward the more populous mid-latitudes since 1982, the starting date for the study released Wednesday by the journal Nature.

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