174  
ABNT30 KNHC 011258  
TWSAT  
 
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  
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 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.  
 

 
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