704  
ABNT30 KNHC 011139  
TWSAT  
 
MONTHLY TROPICAL WEATHER SUMMARY  
NWS NATIONAL HURRICANE CENTER MIAMI FL  
800 AM EDT WED NOV 1 2017  
 
FOR THE NORTH ATLANTIC...CARIBBEAN SEA AND THE GULF OF MEXICO:  
 
THREE NAMED STORMS FORMED IN THE NORTH ATLANTIC BASIN IN OCTOBER,  
AND TWO OF THESE BECAME HURRICANES, WITH OPHELIA REACHING MAJOR  
HURRICANE STRENGTH. BASED ON A 30-YEAR CLIMATOLOGY (1981-2010),  
ACTIVITY WAS ABOVE NORMAL IN THE NUMBER OF NAMED STORMS, HURRICANES  
AND MAJOR HURRICANES. IN TERMS OF THE ACCUMULATED CYCLONE ENERGY  
(ACE), WHICH MEASURES THE COMBINED STRENGTH AND DURATION OF TROPICAL  
STORMS AND HURRICANES, OCTOBER 2017 WAS ABOUT 40 PERCENT MORE ACTIVE  
THAN AN AVERAGE OCTOBER FROM 1981-2010.  
 
FROM A SEASONAL PERSPECTIVE, ACTIVITY IN THE ATLANTIC BASIN SO FAR  
IN 2017 IS WELL ABOVE AVERAGE. IN TERMS OF ACE, THE 2017 SEASON IS  
THE 5TH MOST ACTIVE ON RECORD TO DATE IN THE BASIN, BEHIND 1893,  
1926, 1933, AND 2005.  
 
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  
---------------------------------------------------  
 
* DENOTES A STORM FOR WHICH THE POST-STORM ANALYSIS IS COMPLETE.  
 

 
HURRICANE SPECIALIST UNIT  
 
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