2021 Atlantic hurricane season (GiedriusforCat5)

The 2021 Atlantic hurricane season was an average season in the Atlantic basin, producing 11 storms, 4 hurricanes and 2 major hurricanes. The season was the most active since 2018, and was the most active season in the 2019 - 2023 El Nino period.

The season started very early, with a weak Gulf of Mexico subtropical depression forming in mid - April, causing insignificant damages. May started early with subtropical storm Ana forming on the 3rd and becoming another weak subtropical system. Late in the month, tropical storm Bill formed and became the second pre-season storm of the season, the most since 2016.

The month of June was quiet, except for Claudette which formed late in the month and hit the Florida Panhandle. July was again quiet except in the middle of the month, when Danny, a harmless MDR storm, and Tropical Depression Six, a relatively deadly Central America rainmaker, were active at around the same time.

August started with the first hurricane of the season, the small system with the name Elsa that hit the Windward Islands and had minor effects on land. Just a few days later, Fred formed and quickly became the strongest storm of the season as an MDR Category 2, while Grace was organizing and eventually hit North Carolina as yet another hurricane. Fred degenerated and regenerated 2 times near the Leeward Islands, and also made a tropical storm landfall in Hispaniola. After regenerating for the second time, it started rapidly intensifying and peaked as a Category 4 hurricane just north of the Turks and Caicos islands, and then got carried away by the Gulf Stream. Henri was a weak Central America storm and the first storm of September, while Ida became a disaster as it hit the Leewards as a major and became the second Category 4 of the season.

October was a quiet month, with only Julian, a short lived Cuba and Florida Keys storm, and Kate, a long lived Central American and Mexican storm that lasted into November, forming. The season was destructive, with 107 fatalities and $3.275 billion in damages, resulting mostly from Tropical Depression Six, Fred, and Ida.

Subtropical Depression One
Early on April 17th, a system of thunderstorms began developing over the Gulf Of Mexico. It gained in convection, and once it was apparent that the system had circulation, the NHC began tracking it as a low pressure area at 00:00 UTC April 18th. Later on the day, it was confirmed that the system had a warm core in the middle levels and had no attached fronts, and it was declared subtropical at 18:00 UTC, gaining it the designation Subtropical Depression One. The system moved northeast, and made landfall at 06:00 UTC April 19th near Tampa city in Florida, with ground observations confirming winds of 35 miles per hour. The system afterwards moved quickly over Florida, degenerating back to a non-tropical system at 18:00 UTC, just after it emerged out of Florida. The last advisory on the system was issued 6 hours later at midnight April 20th, at which point it was making landfall roughly on the Georgia - South Carolina border, after which the system lost all circulation.

Subtropical Depression One caused minor effects in Florida, mostly in the Gulf coast of the state, where it caused 3 fatalities in total, and $25 million in damage. The system did not have a large rainfall amount, and at most caused about 2 inches of flooding in the most affected areas, mostly areas surrounding Tampa Bay. In Florida, the system caused one EF1 tornado that hit rural areas, and caused almost no damage and no fatalities.

Storm names
This is the list that was used for the 2021 season. The following names will be used to name tropical and subtropical cyclones in the 2027 season, with the exception of retired names. This is the same list used in the 2015 season, with the exception of Elsa and Julian, which replaced Erika and Joaquin from the 2015 season after they were retired.

Due to caused damage and deaths in the Caribbean region, on April 21, 2022, Fred and Ida were retired and replaced by Faraday and Ivana.