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When an outer eyewall is formed, the moisture and angular momentum necessary for the maintenance of the inner eyewall is now being used to sustain the outer eyewall, causing the inner eye to weaken and dissipate, leaving the tropical cyclone with one eye that is larger in diameter than the previous eye.
In most cases, the outer eyewall begins to contract soon after its formation, which chokes off the inner eye and leaves a much larger but more stable eye. While the replacement cycle tends to weaken storms as it occurs, the new eyewall can contract fairly quickly after the old eyewall dissipates, allowing the storm to re-strengthen.
In tropical cyclones maximum wind speed of the storm, which occurs at the eyewall, is a primary indicator of its overall strength which is important in predicting overall intensity. Just beyond this eyewall is a moat which separates the inner rainbands (eventually the outer eyewall) from the (inner) eyewall.
The eyewall may vary over time in the form of eyewall replacement cycles, particularly in intense tropical cyclones. Outer rainbands can organize into an outer ring of thunderstorms that slowly moves inward, which is believed to rob the primary eyewall of moisture and angular momentum. When the primary eyewall weakens, the tropical cyclone ...
Shortly after peaking in intensity, the coldest cloud tops surrounding the eye warmed slightly and an outer eyewall began to develop, signifying an eyewall replacement cycle was occurring. [16] By late on October 19, the winds in Hurricane Wilma decreased to 160 mph (260 km/h) as the inner 5-mile (8 km) wide eye weakened and the wind field ...
Shanshan underwent an eyewall replacement cycle, in which the inner eyewall deteriorated while being encased by a clearly defined outer eyewall. [22] Shanshan completed its eyewall replacement cycle on August 27 and began rapidly intensifying again, [ 23 ] featuring a symmetric eye with a diameter of 29–35 miles (46–56 km) while stalling ...
However, Matthew began to weaken again as an eyewall replacement cycle took place. The storm significantly weakened while closely paralleling the coasts of Florida and Georgia, the western portion of the outer eyewall came ashore in Florida as a Category 3 hurricane, while the inner eyewall remained just offshore.
Late on September 7, a double eye featured developed, indicating an eyewall replacement cycle, with the strongest winds being recorded in the outer eyewall. [25] By the afternoon of September 8, the eye became cloud filled, indicating weakening; [ 26 ] however, the inner eyewall dissipated later that day, leaving a large, 52 mi (84 km) wide eye ...