This increased hurricane activity is attributed to the warm phase of the Atlantic Multi-Decadal Oscillation (AMO) - which began in 1995 - and has favored more, stronger, and longer-lasting storms since that time. The US National Oceanic and Atmospheric Administration's seasonal hurricane outlooks accurately predicted a high likelihood of an above-normal season with a strong possibility of it being extremely active.
If a hurricane is particularly devastating or deadly, its name will be retired and a new one selected. Male and female names are alternated, and the lists are used every six years. WMO maintains rotating lists of names in alphabetical order for tropical cyclones. WMO Regional Association IV Hurricane Committee will review the season at its annual session in May 2021 and will consider which names should be retired. It was the first time on record, the Atlantic has had two major hurricane formations in November at a time of year when the season is normally winding down. Iota made landfall in Nicaragua on 17 November as a powerful category 4 on the Saffir Simpson scale and impacted an area which had been hit by category 4 Eta less than two weeks previously, with hundreds of casualties. The 2020 season got off to an early and rapid pace with a record nine named storms from May through July, and exhausted WMO's 21-name rotating Atlantic list with Tropical Storm Wilfred (September 18).įor only the second time in history, the Greek alphabet was used for the remainder of the season, extending through the 9th name in the list, Iota. WMO's Tropical Cyclone Programme, now marking its 40th anniversary, works to protect life and property and socio-economic well-being through global and regional coordination and cooperation. Tropical cyclones are one of the world's biggest natural hazards.
Major hurricanes are Category 3 and above on the Saffir Simpson scale, with maximum sustained winds of 178 km/h (111 mph) or greater.Įven though the official hurricane season has concluded, tropical cyclones may still develop. S of 117 km/h (64 knots or 74 mph) or greater. Named storms have winds of 64 km/h (34 knots or 39 mph) or greater. National Oceanic and Atmospheric Administration.Īn average season has 12 named tropical storms, six hurricanes, and three major hurricanes. This is the most storms on record, surpassing the 28 from 2005, and the second-highest number of hurricanes on record.Ģ020 marked the fifth consecutive year with an above-normal Atlantic hurricane season, according to the U.S. There were 12 landfalling storms in the continental United States. The extremely active 2020 Atlantic hurricane season officially ended on 30 November with a record-breaking 30 named tropical storms, including 13 hurricanes and six major hurricanes.
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