2021 Atlantic hurricane season

2021 Atlantic hurricane season
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Basin	Atlantic
Year	2021
First storm formed	May 17, 2021
Last storm dissipated	November 18, 2021
Strongest storm name	Sam
Strongest storm pressure	927
Strongest storm winds	125
Total depress	21
Total storms	21
Fatalities	148
Damages	2000

2021 Atlantic hurricane season The 2021 Atlantic hurricane season produced a near-record number of named storms and notable hurricanes across the Atlantic basin during the climatological 2021 period. Activity affected multiple sovereign states and territories from the Caribbean Sea to the North Atlantic Ocean, prompting responses from international organizations and national agencies. Notable systems caused significant humanitarian, infrastructural, and economic consequences in regions including the United States, Cuba, Mexico, the Leeward Islands, and Atlantic Canada.

Season summary

The season began with subtropical and tropical activity, spawning early systems that formed over the central Atlantic and near the Gulf of Mexico before the climatological peak. Forecasters at the National Hurricane Center and seasonal outlooks by the National Oceanic and Atmospheric Administration incorporated influences from La Niña and anomalous Atlantic multidecadal oscillation patterns, which shifted atmospheric circulation and sea surface temperatures. Observational assets including the GOES-16 satellite, Hurricane Hunter aircraft from the United States Air Force Reserve Command, and ocean buoys from the National Data Buoy Center contributed to operational tracking. The season featured interactions with the Gulf Stream, Sierra Maestra, and the Azores High that affected storm tracks and intensification. International coordination among the World Meteorological Organization, Pan American Health Organization, and regional meteorological services in Cuba, Bahamas, Jamaica, and Barbados supported warnings.

Storms and their impacts

Several storms produced landfalls and widespread impacts. Early in the season, systems traversed near the Yucatán Peninsula and grazed the Florida Keys, affecting infrastructure under the authority of Florida Division of Emergency Management and triggering responses by Federal Emergency Management Agency teams and United States Coast Guard units. Hurricane Ida—which had earlier formed in 2021—was part of the broader context of active Atlantic seasons; major systems in 2021 included storms that affected Hispaniola, Puerto Rico, Turks and Caicos Islands, and the Dominican Republic. Hurricane Sam reached major hurricane status, steered by the Bermuda High and mid-latitude troughs near the Azores, and produced high seas threatening transatlantic shipping lines monitored by the International Maritime Organization. Tropical Storm Elsa impacted the Cayman Islands and portions of Central America, prompting evacuations coordinated with the Caribbean Disaster Emergency Management Agency and national disaster offices in Belize and Honduras. Several systems caused fatal flooding in urban centers like New Orleans and affected energy infrastructure managed by companies such as Entergy Corporation and Petróleos Mexicanos. The cumulative human toll involved search and rescue efforts supported by Red Cross national societies and humanitarian logistics coordinated with United Nations Office for the Coordination of Humanitarian Affairs.

Meteorological statistics and records

The season set or approached multiple records for the number of named storms and rapid intensification events relative to seasonal climatology maintained by NOAA and researchers at Colorado State University. Satellite-derived datasets from NASA and reanalysis by the European Centre for Medium-Range Weather Forecasts highlighted anomalous sea surface temperature patterns in the North Atlantic Current and the Tropical Atlantic that contributed to higher potential intensity metrics. Several hurricanes underwent eyewall replacement cycles observed by Doppler radar from installations such as the National Weather Service radars in Jacksonville, Florida and San Juan, Puerto Rico, while reconnaissance flights logged dropsonde profiles used in ensemble modeling by centers like the National Centers for Environmental Prediction. The season produced above-average accumulated cyclone energy compared to averages in the Atlantic hurricane database, with notable metrics archived by the Hurricane Research Division.

Preparations and response

National and regional preparedness involved pre-storm evacuations, issuance of hurricane warnings by agencies including the Met Office for transatlantic shipping advisories and local advisories by the Bahamas Meteorological Service, Cuban Institute of Meteorology, and Mexico's National Water Commission. Emergency logistics deployed ships from the United States Navy and humanitarian supplies coordinated through USAID and nongovernmental organizations like World Vision and Médecins Sans Frontières. Public health coordination with the World Health Organization addressed vector-borne disease risks after flooding, while agricultural impacts led to interventions by the Food and Agriculture Organization. Local elected officials in jurisdictions such as Louisiana, Texas, Florida, and Puerto Rico activated emergency operations centers and worked with utility companies and private contractors to stage restoration resources.

Aftermath and economic/social effects

Post-storm recovery emphasized rebuilding transportation corridors including ports managed by authorities such as the Port of New Orleans and Port Everglades, restoring electrical grids operated by utilities like Florida Power & Light Company, and addressing insurance claims processed through national and international insurers regulated in markets such as Bermuda. Economic assessments by multilateral institutions including the International Monetary Fund and World Bank estimated damage and reconstruction costs, while social impacts involved displacement managed by national social protection mechanisms in countries including Haiti, Cuba, and The Bahamas. Environmental consequences included coastal erosion at sites like Cape Hatteras and coral stress in reefs monitored by the National Oceanic and Atmospheric Administration's National Marine Fisheries Service and conservation programs run by The Nature Conservancy. Long-term resilience planning engaged agencies such as the United Nations Development Programme and regional bodies including the Organisation of Eastern Caribbean States to incorporate lessons into future hazard mitigation and climate adaptation strategies.

Category:Atlantic hurricane seasons