Atlantic Summary for September 2021
Monthly Summary

000 ABNT30 KNHC 011242 TWSAT Monthly Tropical Weather Summary NWS National Hurricane Center Miami FL 800 AM EDT Wed Sep 1 2021 For the North Atlantic...Caribbean Sea and the Gulf of Mexico: Tropical cyclone activity in the Atlantic basin during August was above normal in terms of the numbers of named storms, hurricanes, and major hurricanes. Six named storms formed in the Atlantic basin in August, with three of them becoming hurricanes, and two of those becoming major hurricanes. Grace was a category 3 hurricane when it made landfall just south of Tuxpan, Mexico, on 22 August, and Ida was a category 4 hurricane when it made landfall near Port Fourchon, Louisiana, on 29 August. One tropical depression formed on the last day of the month. Based on a 30-year climatology (1991-2020), 3 or 4 named storms typically develop in August, with one or two of them becoming hurricanes. A major hurricane forms in August every 1 to 2 years. 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 2021 is above normal, almost 25 percent above the long-term mean. The 11 named storms through the end of August is well above the 30-year (1991-2020) average of 6 to 7 named storms by the end of the month. Reports on individual cyclones, when completed, are available at the National Hurricane Center website at www.hurricanes.gov/data/tcr/index.php?season=2021&basin=atl Summary Table Name Dates Max Wind (mph) --------------------------------------------------- TS Ana 22-23 May 45* TS Bill 14-16 Jun 60 TS Claudette 19-22 Jun 45 TS Danny 28-29 Jun 45 H Elsa 1-9 Jul 85 TS Fred 11-18 Aug 65 MH Grace 13-21 Aug 125 H Henri 16-23 Aug 75 MH Ida 26 Aug- 150 TS Kate 28 Aug- 45 TS Julian 29-30 Aug 60 TD Twelve 31 Aug- 35 --------------------------------------------------- * Denotes a storm for which the post-storm analysis is complete. $$ Hurricane Specialist Unit
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