The World Meteorological Organization is responsible for developing the names for both Northern Pacific and Atlantic storms. They use six lists of names for Atlantic Ocean and Eastern North Pacific storms. These lists rotate, one each year.
That means every six years, the names cycle back around and get reused (which happened in 2019). If a hurricane does tremendous damage, such as Katrina, Sandy, or Harvey, the name is retired and replaced by a different name beginning with the same letter.
The National Hurricane Center explains that names are only given to tropical storms that have sustained wind speeds higher than 39 mph. These names will stay with the storm as it reaches hurricane strength (maximum sustained winds of 74 mph or higher). This means Tropical Storm Debby, for example, will become Hurricane Debby if it reaches maturity.
source – www.farmersalmanac.com
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