Greek alphabet may be used for only 2nd time in history this hurricane season
This is a rare occasion, but there comes a time where we run out of names during hurricane season. When that happens, we enlist the help of the Greek alphabet.
The 2020 Atlantic hurricane season is off to a record-setting start, and at its current pace, the tropical storm count may outnumber the list of 21 names that are used to identify systems -- something that has happened only one other time in recorded history.
As of Friday, Sept. 11, there have been 17 named tropical systems and one unnamed tropical depression in the Atlantic basin, well above average for this point in the season. Typically, there are just 12 named storms in an entire season.
It is looking more and more likely that forecasters may have to use a different system to name tropical storms with the breakneck pace of the season.
The names that are given to tropical storms and hurricanes in the Atlantic basin are determined years in advance by the World Meteorological Organization (WMO).
“The practice of naming storms (tropical cyclones) began years ago in order to help in the quick identification of storms in warning messages because names are presumed to be far easier to remember than numbers and technical terms,” the WMO explained.
The list of names is alphabetical, starting with A every season; however, it does not contain names for all 26 letters. Forecasters skip over the letters Q, U, X, Y, and Z due to a paucity of names that begin with these letters.
After the last name on the list is used, the way that storms are named changes significantly.
Hurricane Florence approaching the eastern U.S. on Sept. 12, 2018. (NOAA / GOES-East)
It is very rare for there to be more than 21 named storms in one season, but there is a set of guidelines in place for such an occasion.
“In the event that more than 21 named tropical cyclones occur in the Atlantic basin in a season, additional storms will take names from the Greek alphabet,” the National Hurricane Center said.
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, there are 24 letters in the Greek alphabet that 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.
Will Greek names be used this hurricane season?
In July, AccuWeather meteorologists were forecasting a hyperactive Atlantic hurricane season with up to 24 named storms, and that prediction is on track to come to fruition.
At this point, there is a strong likelihood that every single name is used this hurricane season and then some. AccuWeather meteorologists are already busy monitoring potential areas for development far out in the basin.
With the formation of Paulette and Rene on Sept. 7, only four names remain to be used before forecasters have to tap into the Greek alphabet: Sally, Teddy, Vicky, and Wilfred.
If the Greek alphabet has to be used in 2020, it would follow the same list as 2005, starting with Alpha. This is similar to how most names are reused every few years, unless the name is retired.
However, there is one big difference between the typical names and the Greek alphabet: 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.
Even when the Atlantic hurricane season ends on Nov. 30, there is still the chance that one or two tropical systems could develop before 2020 comes to a close.
Near the end of 2005, following a historic hurricane season, Tropical Storm Zeta took shape in the far eastern Atlantic Ocean on Dec. 30. Zeta lingered over the open waters of the Atlantic Ocean until Jan. 7, 2006, before it dissipated. Zeta was the sixth storm to be given a name from the Greek alphabet that year.
After the calendar flips to 2021, the next tropical system in the Atlantic basin will be named Ana.
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