596  
ABNT30 KNHC 011244  
TWSAT  
 
MONTHLY TROPICAL WEATHER SUMMARY  
NWS NATIONAL HURRICANE CENTER MIAMI FL  
700 AM EST FRI DEC 1 2017  
 
FOR THE NORTH ATLANTIC...CARIBBEAN SEA AND THE GULF OF MEXICO:  
 
ONE NAMED STORM, RINA, FORMED IN THE NORTH ATLANTIC BASIN IN  
NOVEMBER. BASED ON A 30-YEAR CLIMATOLOGY (1981-2010), A NAMED STORM  
FORMS IN THE BASIN IN ROUGHLY 7 OUT OF 10 YEARS IN NOVEMBER, WITH A  
HURRICANE FORMING ABOUT ONCE EVERY OTHER YEAR.  
 
OVERALL ACTIVITY IN THE ATLANTIC BASIN IN 2017 WAS WELL ABOVE  
AVERAGE, WITH 17 NAMED STORMS, 10 HURRICANES, AND 6 MAJOR  
HURRICANES. THIS COMPARES TO THE LONG-TERM AVERAGES OF 12 NAMED  
STORMS, 6 HURRICANES, AND 3 MAJOR HURRICANES. ONE UNNAMED TROPICAL  
DEPRESSION ALSO FORMED IN 2017.  
 
IN TERMS OF ACCUMULATED CYCLONE ENERGY (ACE), WHICH MEASURES THE  
COMBINED STRENGTH AND DURATION OF TROPICAL STORMS AND HURRICANES,  
PRELIMINARY DATA INDICATE THAT THE 2017 SEASON WAS THE MOST ACTIVE  
SINCE 2005 AND THE 7TH MOST ACTIVE ON RECORD IN THE BASIN, BEHIND  
1933, 2005, 1893, 1926, 1995, AND 2004.  
 
REPORTS ON INDIVIDUAL CYCLONES, WHEN COMPLETED, ARE AVAILABLE AT  
THE NATIONAL HURRICANE CENTER WEBSITE AT  
WWW.HURRICANES.GOV/DATA/TCR/INDEX.PHP?SEASON=2017&BASIN=ATL .  
 
SUMMARY TABLE  
 
NAME DATES MAX WIND (MPH)  
---------------------------------------------------  
TS ARLENE 19-21 APR 50*  
TS BRET 19-20 JUN 45  
TS CINDY 20-23 JUN 60  
TD FOUR 5- 7 JUL 30*  
TS DON 17-18 JUL 50  
TS EMILY 31 JUL- 1 AUG 45  
H FRANKLIN 6-10 AUG 85  
H GERT 13-17 AUG 105  
MH HARVEY 17 AUG- 1 SEP 130  
MH IRMA 30 AUG-12 SEP 185  
MH JOSE 5-22 SEP 155  
H KATIA 5- 9 SEP 105*  
MH LEE 15-30 SEP 115  
MH MARIA 16-30 SEP 175  
H NATE 4- 9 OCT 90  
MH OPHELIA 9-15 OCT 115  
TS PHILIPPE 28-29 OCT 60  
TS RINA 6- 9 NOV 60  
---------------------------------------------------  
 
* DENOTES A STORM FOR WHICH THE POST-STORM ANALYSIS IS COMPLETE.  
 

 
HURRICANE SPECIALIST UNIT  
 
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