ABNT30 KNHC 011258

Monthly Tropical Weather Summary
NWS National Hurricane Center Miami FL
800 AM EST Fri Dec 1 2023

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

No tropical cyclones formed in the Atlantic basin in the month of 
November.  Based on a 30-year climatology (1991-2020), a tropical 
storm forms in November once every year or two, and a hurricane 
forms once every two years.  A disturbance (Potential Tropical 
Cyclone Twenty-Two) caused heavy rains and flooding across portions 
of Jamaica, eastern Cuba, and Hispaniola during the middle part of 
the month, but the system did not become a tropical cyclone.

Overall, the 2023 Atlantic hurricane season had above-normal 
activity in terms of the number of named storms but a normal amount 
of activity in terms of the number of hurricanes and major 
hurricanes.  In 2023, 20 storms of at least tropical storm strength 
formed, of which 7 became hurricanes and 3 became major hurricanes 
(category 3 or higher on the Saffir-Simpson Hurricane Wind Scale). 
This compares to the long-term (1991-2020) averages of 14 named 
storms, 7 hurricanes, and 3 major hurricanes.  In terms of 
Accumulated Cyclone Energy (ACE), which measures the strength and 
duration of tropical storms and hurricanes, activity in the basin 
in 2023 was about 20 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              22-24 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