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The eye is a region of mostly calm weather at the center of a tropical cyclone. The eye of a storm is a roughly circular area, typically 30–65 kilometers (19–40 miles; 16–35 nautical miles) in diameter. It is surrounded by the eyewall, a ring of towering thunderstorms where the most severe weather and highest winds of the cyclone occur.
The cyclone's lowest barometric pressure occurs in the eye, and can be as much as 15% lower than the atmospheric pressure outside the storm. In strong tropical cyclones, the eye is characterized by light winds and clear skies, surrounded on all sides by a towering, symmetric eyewall.
Concentric eyewalls seen in Typhoon Haima as it travels west across the Pacific Ocean.. In meteorology, eyewall replacement cycles, also called concentric eyewall cycles, naturally occur in intense tropical cyclones with maximum sustained winds greater than 33 m/s (64 kn; 119 km/h; 74 mph), or hurricane-force, and particularly in major hurricanes of Saffir–Simpson category 3 to 5.
The cyclone's lowest barometric pressure occurs in the eye, and can be as much as 15% lower than the atmospheric pressure outside the storm. [10] In weaker tropical cyclones, the eye is less well-defined or nonexistent, and can be covered by cloudiness caused by cirrus cloud outflow from the surrounding central dense overcast.
Depending on the location, they are given different names such as hurricanes, cyclones, or typhoons. Annular tropical cyclone – a tropical cyclone that possesses annular characteristics. Annular characteristics are often seen in major cyclones, where they possess a symmetrical eye and a thick ring of convection.
2021 - Cyclone Niran was the strongest storm of the 2020-21 Australian Region cyclone season, peaking with 260 km/h (160 mph). March 6 1988 - The remnants of Cyclone Bola started bringing rainfall to New Zealand , where the storm killed three people and left US$82 million in damage.
The distance from the center of a tropical cyclone to the location of the cyclone's maximum winds. In well-developed hurricanes, the radius of maximum winds is generally found at the inner edge of the eyewall. [1] Radius of outermost closed isobar (ROCI) One of the quantities used to determine the size of a tropical cyclone.
A tropical cyclone usually develops a distinct eye when the maximum sustained winds of the storm reach and exceed 74 mph. A well-formed eye is a good indicator of overall intensity due to an increase in rotational velocity when the distance between the moving particles and the center of the vortex is decreased.