Theta is a Greek letter. It was used in 2020, after the 21 regular Atlantic names had run out. In March 2021 the World Meteorological Organization decided the Greek alphabet will not be used in future; a supplemental list of names is used instead. It is the only storm named Theta in our archive, which covers every ocean since 1980.
It won’t be. In March 2021 the WMO Hurricane Committee decided the Greek alphabet will not be used in future, because it distracted from warnings and some letters (Zeta, Eta, Theta) sound alike (WMO Hurricane Committee retires tropical cyclone names and ends the use of Greek alphabet). When the 21 regular Atlantic names run out, storms now take names from a supplemental list approved by the WMO, which starts Adria, Braylen, Caridad (Tropical Cyclone Naming History and Retired Names).
Theta formed in the Atlantic in November 2020 and peaked as a tropical storm with maximum sustained winds of 70 mph (110 km/h) and a minimum pressure of 987 mb. It did not make landfall. The system was tracked for 8 days.
Tropical Storm Theta (2020): track and historyNames go in alphabetical order, one per storm, as each storm reaches tropical-storm strength (39 mph, 34 knots), so a storm’s place in its season decides its name.
In 2020, Theta was the 29th name used in the Atlantic season, after all 21 regular names.
In 2005 (Alpha to Zeta) and 2020 (Alpha to Iota), the regular list ran out and later storms took Greek letters in order.
The most recent was Tropical Storm Theta in 2020, in the Atlantic. It formed on November 8, peaked at 70 mph (110 km/h) and lasted 8 days. It did not make landfall. It was the 29th name used in that Atlantic season. It is the only storm named Theta in our archive, which covers every ocean since 1980.