Atlantic Summary for October 2023
Monthly Summary

000 ABNT30 KNHC 011137 TWSAT Monthly Tropical Weather Summary NWS National Hurricane Center Miami FL 800 AM EDT Sun Oct 1 2023 For the North Atlantic...Caribbean Sea and the Gulf of Mexico: Tropical cyclone activity in the Atlantic basin was generally above normal in September with the formation of seven named storms, with three of those becoming hurricanes, and one becoming a major hurricane (Lee). In addition, Tropical Storms Gert and Jose and Hurricane Franklin all completed their life cycle early in September. Based on a 30-year climatology (1991-2020), between 4-5 named storms typically develop in September, with three of them becoming hurricanes, and one of those becoming a major hurricane. Lee became a category 5 hurricane in the central tropical Atlantic and later on its large wind field affected portions of coastal New England in the United States, and Nova Scotia and New Brunswick in Canada as the hurricane became post-tropical. Later in the month, Ophelia made landfall in North Carolina as a strong tropical storm. In terms of Accumulated Cyclone Energy (ACE), which measures the strength and duration of tropical storms and hurricanes, activity in the basin so far in 2023 has been about 33 percent above average compared to the long-term (1991-2020) mean. Reports on individual cyclones, when completed, are available at the National Hurricane Center website at www.hurricanes.gov/data/tcr/index.php?season=2023&basin=atl Summary Table Name Dates Max Wind (mph) ----------------------------------------------------------- Unnamed STS 16-17 Jan 70* TS Arlene 1-3 Jun 40* TS Bret 19-24 Jun 70 TS Cindy 22-26 Jun 60* H Don 14-24 Jul 75 TS Emily 20-21 Aug 50 MH Franklin 20 Aug- 1 Sep 150 TS Gert 19- 4 Sep 60 TS Harold 21-23 Aug 50 MH Idalia 26-31 Aug 130 TS Jose 29 Aug- 1 Sep 60 TS Katia 1- 4 Sep 60 MH Lee 5-16 Sep 165 H Margot 7-17 Sep 90 H Nigel 15-22 Sep 100 TS Ophelia 21-24 Sep 70 TS Philippe 23- Sep 50 TS Rina 28- Sep 50 ----------------------------------------------------------- * Denotes a storm for which the post-storm analysis is complete. $$ Hurricane Specialist Unit
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