By Patrick J. Fitzpatrick

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Typically an eye starts at about 25 miles wide during the transition from tropical storm to hurricane. As the hurricane intensifies, usually the eye contracts. However, sometimes a second eyewall forms outside the original eyewall, known as the concentric eyewall cycle (Willoughby et al. 1982). This outer eyewall cuts off the inflow to the inner eyewall, causing the inner one to weaken and dissipate. As the eye expands, temporary weakening occurs. The outer eyewall will begin to contract inward to replace the inner eyewall, and about 12 to 24 hours later, intensification resumes.

Therefore, a hurricane with maximum sustained winds of 90 mph will actually contain gusts of 100 mph or more. Also, one should note that these categories are defined by maximum winds somewhere in the storm, almost always near the center, and that winds may be slower in other parts of the storm. For example, maximum sustained winds of 90 mph may be concentrated only in the northeast section near the hurricane center, with the southwest quadrant containing weaker winds. By international agreement, the most general term for all large cyclonically rotating thunderstorm complexes over tropical oceans is tropical cyclones.

Male names were added to the lists in the following years: Northwest Pacific in 1979, Northeast Pacific in 1978, Atlantic in 1979, Australia in the 19741975 season, and Southwest India in the 19741975 season. 4 shows six lists of names for the Atlantic Ocean. Each list is used alphabetically for a particular year, then is recycled six years later. 5) and replaced by a new name beginning with the same letter (LePore 1996). The letters ''Q," "U," "X," "Y," and "Z" are not used by the National Hurricane Center (NHC), leaving 21 names on the list.

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