Stormy Weather

Hurricanes, Monsoons, and Tropical Storms

What is an anticyclone?

Rather than a having a low-pressure mass surrounded by swirling air, an anticyclone is an air mass centered around a high-pressure area with air rotating around it in a clockwise manner (in the Northern Hemisphere) and counterclockwise south of the equator. As with a cyclone, in an anticyclone air rotates faster the greater the difference between the air pressure at the center compared to the surrounding air.

A P-3 airplane operated by NOAA flies near the eye of a hurricane (NOAA).

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