000 ABNT30 KNHC 011251 TWSAT Monthly Tropical Weather Summary NWS National Hurricane Center Miami FL 800 AM EST Tue Dec 1 2020 For the North Atlantic...Caribbean Sea and the Gulf of Mexico: Tropical cyclone activity in the Atlantic basin during the month of November was extremely active, with two tropical cyclones developing during the month and a third tropical cyclone, Eta, continuing from the end of October. Two of the storms, Eta and Iota, became major hurricanes, with Iota becoming the latest observed category 5 hurricane on record in the North Atlantic basin. Both Eta and Iota made landfall in Nicaragua as major hurricanes in nearly the same location. Based on a 30-year climatology (1981-2010), a tropical storm forms in the basin in November every one to two years, a hurricane forms every other year, and a major hurricane forms every seven to eight years. Overall, the 2020 Atlantic hurricane season was extremely active, with well above normal activity for the season. A record thirty named storms formed, with thirteen becoming hurricanes and six becoming major hurricanes - category 3 or higher on the Saffir-Simpson Hurricane Wind Scale. This compares to the long-term average of twelve named storms, six hurricanes, and three major hurricanes. There was also one tropical depression that did not reach tropical-storm strength. In terms of Accumulated Cyclone Energy (ACE), which measures the strength and duration of tropical storms and hurricanes, activity in the Atlantic basin in 2020 was 75 percent above the long-term mean. A record twelve named storms made landfall in the United States in 2020, with an additional storm, Arthur, not making landfall but producing tropical storm force winds along the coast of North Carolina. Reports on individual cyclones, when completed, are available at the National Hurricane Center website at www.hurricanes.gov/data/tcr/index.php?season=2020&basin=atl Summary Table Name Dates Max Wind (mph) --------------------------------------------------- TS Arthur 16-19 May 60* TS Bertha 27-28 May 50* TS Cristobal 1-9 Jun 60 TS Dolly 22-24 Jun 45 TS Edouard 4-6 Jul 45 TS Fay 9-11 Jul 60 TS Gonzalo 21-25 Jul 65 H Hanna 23-27 Jul 90 H Isaias 30 Jul-5 Aug 85 TD Ten 31 Jul-1 Aug 35 TS Josephine 11-16 Aug 45 TS Kyle 14-16 Aug 50 MH Laura 20-28 Aug 150 H Marco 20-25 Aug 75 H Nana 1-4 Sep 75 TS Omar 31 Aug-5 Sep 40 H Paulette 7-22 Sep 105 TS Rene 7-14 Sep 50 H Sally 11-17 Sep 105 MH Teddy 12-22 Sep 140 TS Vicky 14-17 Sep 50 TS Wilfred 18-20 Sep 40 SS Alpha 18 Sep 50 TS Beta 17-22 Sep 60 TS Gamma 2-5 Oct 70 MH Delta 4-10 Oct 145 MH Epsilon 19-26 Oct 115 H Zeta 24-29 Oct 110 MH Eta 31 Oct-13 Nov 150 TS Theta 10-15 Nov 70 MH Iota 13-18 Nov 160 --------------------------------------------------- * Denotes a storm for which the post-storm analysis is complete. $$ Hurricane Specialist Unit