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Hurricane Sandy's impact on the U.S. east coast was largely the result of something called a blocking pattern. Hurricane Sandy first formed over the Caribbean Sea and moved northward. This was likely due to the Azores High, a semipermmanent high pressure area over the Atlantic that plays a major role in the paths of Atlantic hurricanes.

As Sandy moved parallel to the east coast a powerful high pressure system over Greenland stalled the normal eastward flow of weather systems in the temperate latitudes and prevented Sandy from moving further north. So Sandy made an unprecedented turn to the west and into the U.S. East Coast.

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12y ago

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