Tropical cyclone names in the Atlantic vary year-to-year and the list of names is rotated every six years. But where do the names come from, and who chooses them?
– Why name tropical cyclones?
– When (and how) is a tropical cyclone named?
– History of Hurricane Names
– 2020-2025 Names in the Atlantic Basin
– Retired Names
– What happens if we run out of names in one year?
– A Crossover Event: Atlantic to East Pacific Tropical Cyclones
Why name tropical cyclones?
According to the National Hurricane Center (NHC), “experience shows that the use of short, distinctive names in written as well as spoken communications is quicker and less subject to error than the older, more cumbersome latitude-longitude identification methods.”
We’ve actually seen this work in numbering tropical waves as it moves across T&T over the last few years.
The NHC continues, “these advantages are especially important in exchanging detailed storm information between hundreds of widely scattered stations, coastal bases, and ships at sea.”
The use of easily remembered names greatly reduces confusion when two or more tropical storms occur at the same time. This is also true of tropical waves when T&T experiences back-to-back waves and inclement weather associated with one or both.
In the past, confusion and false rumors have arisen when storm advisories broadcast from radio stations were mistaken for warnings concerning an entirely different storm located hundreds of miles away.
When (and how) is a tropical cyclone named?
In all basins, then a tropical cyclone reaches tropical-storm-strength, the respective Meteorological Organizations in charge of that area (National Hurricane Center for the Atlantic and Eastern Pacific Basins), will name the tropical system.
Note that tropical cyclones can form, such as tropical depressions and never be named as it never reaches tropical-storm-strength. In addition, in post-season analysis, tropical cyclones may be added and will not be named.
The names alternate between male and female for each year and follow alphabetical order (A through W). Forecasters skip over the letters Q, U, X, Y, and Z due to the very few names that begin with these letters.
According to the World Meteorological Organization (WMO), there is a strict procedure to determine a list of tropical cyclone names in an ocean basin by the Tropical Cyclone Regional Body responsible for that basin at its annual/biennial meeting.
The regional bodies (hurricane committees for respective regions) determine a predesignated list of hurricane names for six years separately at its annual meeting. These names are proposed by members in that region, including national meteorological and hydrological services in Northern and Central America as well as the Caribbean.
The WMO also noted that tropical cyclones/hurricanes/typhoons are not named after any particular person. The names selected are those that are familiar to the people in each region. Storms are named for people to easily understand and remember the tropical cyclone/hurricane/typhoon in their region, thus facilitating disaster risk awareness, preparedness, management, and reduction.
The History of Hurricane Names
In the beginning, storms were named arbitrarily. An Atlantic storm that ripped off the mast of a boat named Antje became known as Antje’s hurricane. Then the mid-1900s saw the start of the practice of using feminine names for storms.
In the pursuit of a more organized and efficient naming system, meteorologists later decided to identify storms using names from a list arranged alphabetically. Thus, a storm with a name that begins with A, like Anne, would be the first storm to occur in the year. Before the end of the 1900s, forecasters started using male names for those forming in the Southern Hemisphere.
Since 1953, Atlantic tropical storms have been named from lists originated by the National Hurricane Center. They are now maintained and updated by an international committee of the World Meteorological Organization. The original name lists featured only women’s names. In 1979, men’s names were introduced, and they alternate with the women’s names. Six lists are used in rotation. Thus, the 2020 list will be used again in 2026.
2020-2025 Names in the Atlantic Basin
The six lists below are used in rotation and re-cycled every six years, i.e., the 2020 list will be used again in 2026, barring any retired names that will need to be replaced.
The only time that a tropical cyclone name is retired is if a storm is so deadly or costly that the future use of its name on a different storm would be inappropriate for obvious reasons of sensitivity. If that occurs, then at an annual meeting by the committee (called primarily to discuss many other issues) the offending name is stricken from the list, and another name is selected to replace it.
There is an exception to the retirement rule, however. Before 1979, when the first permanent six-year storm name list began, some storm names were simply not used anymore. For example, in 1966, “Fern” was substituted for “Frieda,” and no reason was cited.
Below is a list of retired names for the Atlantic Ocean, Caribbean Sea, and the Gulf of Mexico. There are, however, a great number of destructive storms not included on this list because they occurred before the hurricane naming convention was established in 1950.
What happens if we run out of names in one year?
In the event that more than twenty-one named tropical cyclones occur in the Atlantic basin in a season, additional storms will take names from the Greek alphabet. This naming convention has been established by the World Meteorological Organization Tropical Cyclone Programme.
This means that the 22nd named storm would be named after the first letter in the Greek Alphabet, Alpha, followed by the second letter, Beta, and so on. In all, 24 letters in the Greek Alphabet can be used.
Since naming tropical storms and hurricanes began during the mid-1900s, there has been only one year where there were more than 21 named storms in a single hurricane season.
The notorious 2005 Atlantic hurricane season spawned a record-breaking 28 named storms. Several storms strengthened into historic hurricanes, including Katrina, Rita and Wilma that year. “The season marked the first time that meteorologists had to resort to the use of the Greek alphabet for the naming of tropical cyclones,” the WMO said.
If the Greek alphabet has to be used in 2020, it would follow the same list as 2005, starting with Alpha. However, letters of the Greek alphabet that are used for tropical systems cannot be retired.
“If a significant storm designated by a letter of the Greek Alphabet, in either the Atlantic or eastern North Pacific Basin, were considered worthy of being ‘retired,’ it would be included in the list of retired names with the year of occurrence and other details, but that particular letter in the Greek Alphabet would continue to be available for use in the future,” the WMO explained.
Once the year changes, as we move from 2020 to 2021, the new list of names will be used.
A Crossover Event: Atlantic to East Pacific Tropical Cyclones (and vice versa)
What happens if a tropical cyclone from the Atlantic moves across Central America into the Pacific – or the other way around – will it keep its name?
Prior to 2000, storms were renamed after crossing from the Gulf of Mexico into the Eastern Pacific. At the 22nd hurricane committee in 2000 it was decided that tropical cyclones that moved from the Atlantic to the Eastern Pacific basin and vice versa would no longer be renamed.
The most recent tropical cyclone to complete this feat was Hurricane Otto in 2016.
Contributing by De-Shaun Robinson