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Monthly Atlantic Tropical Weather Summary

ABNT30 KNHC 011159

Monthly Tropical Weather Summary
NWS National Hurricane Center Miami FL
800 AM EDT Wed Nov 1 2023

For the North Atlantic...Caribbean Sea and the Gulf of Mexico:

Tropical cyclone activity in the Atlantic basin was near normal in 
October with the formation of two named storms, with one of those 
becoming a hurricane (Tammy). One tropical depression also formed. 
In addition, Tropical Storms Philippe and Rina both completed their 
life cycle early in October. Based on a 30-year climatology 
(1991-2020), between 2-3 named storms typically develop in October, 
with one of them becoming a hurricane, and one a major hurricane. 

Philippe which formed in September affected portions of the northern 
Leeward Islands as a tropical storm early in the month. Tammy also
affected portions of the Leeward Islands in October.  Tammy made
landfall as a hurricane on Barbuda during the evening of 21 October. 
Tropical Depression Twenty-One moved inland over Nicaragua a few 
days later bringing heavy rainfall with flash and urban flooding. 

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 30 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

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- 6 Oct                 50
TS Rina             28 Sep- 1 Oct                 50
TS Sean                 11-15 Oct                 45
H  Tammy                18-29 Oct                105
TD Twenty-One           23-24 Oct                 30

* Denotes a storm for which the post-storm analysis is complete.

Hurricane Specialist Unit