Antihurricane

An antihurricane is the opposite of a hurricane. Although it is surrounded by a ring of rainy, windy weather, the center has extremely high pressure (often over 1100 millibars), near 0 percent relative humidity, completely clear skies and no wind. In other words, an antihurricane is a hurricane with a giant eye; however they are classified differently. Unlike hurricanes, which are classified by low pressure and high winds, antihurricanes are classified by diameter and high pressure. They are classified by "negative categories", starting with Category -1 and ending with Category -5.

A category -5 antihurricane, the strongest antihurricane, is a diameter of over 800 feet and pressure of over 1100 millibars.