Ask the Weather Guys: What happens to hurricanes in the mid-latitudes?

2022-09-24 02:13:40 By : Ms. Nia Top

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A home floats in the Snake River near Nome, Alaska, on Saturday as the remnants of Typhoon Merbok moved into the Bering Sea region.

A: Hurricanes are large-scale, organized storms that form in the tropical latitudes.

They are fueled by the enormous amount of heat released when water vapor, evaporated off the warm tropical ocean surface, changes phase to liquid and ice in the thunderstorm clouds of the hurricane.

They are smaller in areal extent than the storms that commonly affect the mid-latitudes.

The distribution of clouds and precipitation in a hurricane is usually symmetric about its center (the eye). This is vastly different from the characteristically asymmetric distribution of clouds in the more familiar extratropical cyclones.

Despite their tropical origin, hurricanes do find their way to the mid-latitudes with regularity, especially in the western Pacific Ocean basin. When they make this excursion they often undergo a dramatic restructuring that, in concert with interactions from the wavy flow of the mid-latitudes, can lead to powerful extratropical storms.

Such a situation occurred last Friday and Saturday when former Typhoon Merbok migrated from the tropics toward the central Bering Sea and became a devastating extratropical cyclone with 50 foot seas and wind gusts exceeding 80 mph.

Such extratropical transitions are most frequent in September and October in the Northern Hemisphere and can have global ramifications for the weather and its predictability.

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"Weather Guys" Steve Ackerman and Jonathan Martin are professors in the University of Wisconsin-Madison department of atmospheric and oceanic sciences.

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