The 2021 Atlantic hurricane season was the third most active Atlantic hurricane season on record with 21 named storms, and the sixth consecutive year in which there was above-average tropical cyclone activity The season officially began on June 1, 2021, and ended on November 30, 2021. These dates, adopted by convention, historically describe the period in each year when most Northern Atlantic tropical cyclones form. However, tropical cyclone formation is possible at any time of the year, as was the case this season, when Tropical Storm Ana formed on May 22. The season's final system, Tropical Storm Wanda, dissipated on November 7.

Of the season's 21 named storms, seven became hurricanes, and four further intensified into major hurricanes. The season's most devastating storm was Hurricane Ida. It made landfall in Louisiana with maximum sustained winds of , destroying coastal communities in its path.

This timeline documents tropical cyclone formations, strengthening, weakening, landfalls, extratropical transitions, and dissipations during the season. It includes information that was not released throughout the season, meaning that data from post-storm reviews by the National Hurricane Center, such as a storm that was not initially warned upon, has been included.

The time stamp for each event is first stated using Coordinated Universal Time (UTC), the 24-hour clock where 00:00 = midnight UTC. The NHC uses both UTC and the time zone where the center of the tropical cyclone is currently located. The time zones utilized (east to west) are: Greenwich, Cape Verde, Atlantic, Eastern, and Central. In this timeline, the respective area time is included in parentheses. Additionally, figures for maximum sustained winds and position estimates are rounded to the nearest 5 units (miles, or kilometers), following National Hurricane Center practice. Direct wind observations are rounded to the nearest whole number. Atmospheric pressures are listed to the nearest millibar and nearest hundredth of an inch of mercury. __TOC__

Timeline

May

May 22 06:00 UTC (2:00 a.m. AST) at   Subtropical Storm Ana forms from an extratropical cyclone about 200 mi (325 km) northeast of Bermuda.

May 23 00:00 UTC (8:00 p.m. AST, May 23) at   Subtropical Storm Ana transitions to a tropical storm about 235 mi (280 km) northeast of Bermuda. 06:00 UTC (2:00 a.m. AST) at   Tropical Storm Ana reaches peak intensity with winds of 45 mph (75 km/h) and a minimum central pressure of , about 295 mi (470 km) northeast of Bermuda. 18:00 UTC (2:00 p.m. AST) at   Tropical Storm Ana transitions to a post-tropical cyclone about 455 mi (730 km) northeast of Bermuda, and subsequently opens up into a trough.

June

June 1 The 2021 Atlantic hurricane season officially begins.

June 14 06:00 UTC (2:00 a.m. EDT) at   Tropical Depression Two forms from a stationary front about east-southeast of Cape Fear, North Carolina. 18:00 UTC (2:00 p.m. EDT) at   Tropical Depression Two strengthens into Tropical Storm Bill about east of Cape Hatteras, North Carolina.

June 15 12:00 UTC (8:00 a.m. AST) at   Tropical Storm Bill reaches its peak intensity with maximum sustained winds of and a minimum central pressure of , about east-southeast of Chatham, Massachusetts.

June 16 00:00 UTC (8:00 p.m. AST, June 15) at   Tropical Storm Bill transitions into a post-tropical cyclone about east-southeast of Halifax, Nova Scotia, and later degenerates into a trough of low pressure.

June 19 00:00 UTC (7:00 p.m. CDT, June 18) at   Tropical Storm Claudette forms from an area of low pressure about south of Morgan City, Louisiana. 04:30 UTC (11:30 p.m. CDT, June 18) at Tropical Storm Claudette makes landfall in Terrebonne Parish, Louisiana, about south-southwest of Houma. 06:00 UTC (1:00 a.m. CDT) at Tropical Storm Claudette reaches its peak intensity with maximum sustained winds of and a minimum central pressure of , about south-southwest of Houma. 18:00 UTC (1:00 p.m. CDT) at Tropical Storm Claudette weakens into a tropical depression over eastern Alabama, about northeast of Houma.

June 21 06:00 UTC (2:00 a.m. EDT) at Tropical Depression Claudette re-strengthens into a tropical storm just off the North Carolina coast.

June 22 06:00 UTC (2:00 a.m. AST) at Tropical Storm Claudette transitions to an extratropical low, and subsequently dissipates southeast of the coast of Nova Scotia.

June 27 18:00 UTC (2:00 p.m. EDT) at Tropical Depression Four forms from a non-tropical low about east-southeast of Charleston, South Carolina.

June 28 06:00 UTC (2:00 a.m. EDT) at Tropical Depression Four strengthens into Tropical Storm Danny about southeast of Charleston. 18:00 UTC (2:00 p.m. EDT) at Tropical Storm Danny reaches peak intensity with winds of and a minimum central pressure of , about south-southeast of Charleston. 23:20 UTC (7:20 p.m. EDT) at Tropical Storm Danny makes landfall on Pritchards Island, north of Hilton Head, South Carolina, with sustained winds of .

June 29 00:00 UTC (8:00 p.m. EDT, June 28) at Tropical Storm Danny weakens into a tropical depression inland over eastern South Carolina, and later dissipates over eastern Georgia.

June 30 18:00 UTC (2:00 p.m. AST) at Tropical Depression Five forms from a tropical wave about east-southeast of Barbados.

July

July 1 00:00 UTC (8:00 p.m. AST, June 30) at Tropical Depression Five strengthens into Tropical Storm Elsa about east-southeast of Barbados.

July 2 12:00 UTC (8:00 a.m. AST) at Tropical Storm Elsa strengthens into a Category 1 hurricane about south of Barbados. 18:00 UTC (2:00 p.m. AST) at Hurricane Elsa reaches peak intensity with winds of and a minimum central pressure of , about west-northwest of Saint Vincent.

July 3 12:00 UTC (8:00 a.m. AST) at Hurricane Elsa weakens into a tropical storm about south of the southern coast of the Dominican Republic.

July 5 18:00 UTC (2:00 p.m. AST) at Tropical Storm Elsa makes landfall on the south coast of Cuba in Cienaga de Zapata National Park with maximum winds of about .

July 7 00:00 UTC (8:00 p.m. EDT, July 6) at Tropical Storm Elsa re-strengthens into a Category 1 hurricane about west of Englewood, Florida. 06:00 UTC (2:00 a.m. EDT) at Hurricane Elsa weakens again into a tropical storm about west of St. Petersburg, Florida. 14:30 UTC (10:30 a.m. EDT) at Tropical Storm Elsa makes landfall in Taylor County, Florida with maximum winds of about .

July 9 15:00 UTC (11:00 a.m. EDT) at Tropical Storm Elsa makes landfall near East Hampton, New York with maximum winds of about . 16:30 UTC (12:30 p.m. EDT) at Tropical Storm Elsa makes landfall near Westerly, Rhode Island with maximum winds of about . 18:00 UTC (2:00 p.m. EDT) at Tropical Storm Elsa transitions into an extratropical cyclone over southeastern New England, and later dissipates.

August

August 11 00:00 UTC (8:00 p.m. AST, August 10) at Tropical Storm Fred forms as the result of interaction between a series of tropical waves about south-southeast of Ponce, Puerto Rico. 17:00 UTC (1:00 p.m. AST) at Tropical Storm Fred makes landfall near San Cristóbal, Dominican Republic, with maximum sustained winds of .

August 12 00:00 UTC (8:00 p.m. EDT, August 11) at Tropical Storm Fred weakens to a tropical depression over central Hispaniola, southeast of Cap-Haïtien, Haiti.

August 13 00:00 UTC (8:00 p.m. EDT, August 12) at Tropical Depression Fred re-strengthens to a tropical storm about east-northeast of Holguín, Cuba. 06:00 UTC (2:00 p.m. AST) at Tropical Depression Seven forms from a tropical wave about east of the Leeward Islands. 12:00 UTC (8:00 a.m. EDT) at Tropical Storm Fred again weakens into a tropical depression as it simultaneously makes landfall on Cayo Romano, on the northern coast of Cuba.

August 14 00:00 UTC (8:00 a.m. EDT, August 13) at Tropical Depression Fred degenerates into an open trough over central Cuba. 12:00 UTC (8:00 a.m. AST) at Tropical Depression Seven strengthens into Tropical Storm Grace about east-southeast of the Leeward Islands.

August 15 00:00 UTC (8:00 p.m. AST, August 14) at Tropical Storm Grace weakens into a tropical depression about north of Guadeloupe. 12:00 UTC (8:00 a.m. EDT) at Remnants of Fred re-develop into a tropical storm about west of Naples, Florida. 18:00 UTC (2:00 p.m. AST) at Tropical Depression Eight forms from a surface low pressure system about northeast of Bermuda.

August 16 12:00 UTC (8:00 a.m. AST) at Tropical Depression Grace re-strengthens into a tropical storm about east of Beata Island, Dominican Republic. 16:30 UTC (12:30 p.m. AST) at Tropical Storm Grace makes landfall just south of Oviedo, Dominican Republic, with sustained winds of . 18:00 UTC (1:00 p.m. CDT) at Tropical Storm Fred reaches peak intensity with maximum sustained winds of and a minimum central pressure of , about southwest of Apalachicola, Florida. 18:00 UTC (2:00 p.m. AST) at Tropical Depression Eight strengthens into Tropical Storm Henri southeast of Bermuda. 19:00 UTC (2:00 p.m. CDT) at Tropical Storm Fred makes landfall at peak intensity on the St. Joseph Peninsula, just northwest of Cape San Blas, in the Florida Panhandle.

August 17 12:00 UTC (8:00 a.m. EDT) at Tropical Storm Fred weakens to a tropical depression over eastern Alabama. 14:00 UTC (10:00 a.m. EDT) at Tropical Storm Grace makes landfall on the northeastern coast of Jamaica near Black Hill, with sustained winds of .

August 18 00:00 UTC (8:00 p.m. EDT, August 17) at Tropical Storm Fred becomes a post-tropical low over eastern Tennessee. 12:00 UTC (8:00 a.m. EDT) at Tropical Storm Grace strengthens into a Category 1 hurricane about west-southwest of Grand Cayman.

August 19 00:00 UTC (8:00 p.m. EDT, August 18) at Post-Tropical Cyclone Fred becomes an extratropical low over central Pennsylvania, and subsequently dissipates. 09:45 UTC (4:45 a.m. CDT) at Hurricane Grace makes landfall about south of Tulum, Quintana Roo, with sustained winds of . 12:00 UTC (7:00 a.m. CDT) at Hurricane Grace weakens into a tropical storm inland over the Yucatán Peninsula.

August 20 12:00 UTC (7:00 a.m. CDT) at Tropical Storm Grace re-strengthens into a Category 1 hurricane about east-southeast of Tuxpan, Veracruz. 18:00 UTC (1:00 p.m. CDT) at Hurricane Grace intensifies to Category 2 strength about east-southeast of Tuxpan.

August 21 00:00 UTC (7:00 p.m. CDT, August 20) at Hurricane Grace intensifies to Category 3 strength about east of Tuxpan, and simultaneously reaches peak intensity with winds of and a minimum central pressure of . 05:30 UTC (12:30 a.m. CDT) at Hurricane Grace makes landfall near Tecolutla, Veracruz, at peak intensity. 12:00 UTC (7:00 a.m. CDT) at Hurricane Grace weakens to a tropical storm about southwest of Tuxpan, and the surface circulation later dissipates. 12:00 UTC (8:00 a.m. EDT) at Tropical Storm Henri strengthens into a Category 1 hurricane about southeast of Cape Hatteras, North Carolina.

August 22 06:00 UTC (2:00 a.m. EDT) at Hurricane Henri reaches peak intensity with maximum sustained winds of and a minimum central pressure of , about south-southeast of Block Island, Rhode Island. 12:00 UTC (8:00 a.m. EDT) at Hurricane Henri weakens into a tropical storm, about south-southeast of Block Island. 15:20 UTC (11:20 a.m. EDT) at Tropical Storm Henri makes landfall on Block Island with sustained winds of . 16:15 UTC (12:15 p.m. EDT) at Tropical Storm Henri makes landfall near Westerly, Rhode Island with sustained winds of .

August 23 00:00 UTC (8:00 p.m. EDT, August 22) at Tropical Storm Henri weakens into a tropical depression about northwest of Westerly. 18:00 UTC (2:00 p.m. EDT) at Tropical Depression Henri degenerates into a remnant low about northwest of Westerly, and subsequently dissipates.

August 26 15:00 UTC (11:00 a.m. EDT) at Tropical Depression Nine forms from a combination of multiple low-latitude weather systems, starting with a tropical wave, about southwest of Kingston, Jamaica.