000
ABNT30 KNHC 011150
TWSAT
Monthly Tropical Weather Summary
NWS National Hurricane Center Miami FL
800 AM EDT Sun Oct 1 2017
For the North Atlantic...Caribbean Sea and the Gulf of Mexico:
The North Atlantic basin was extremely active in September. Four
tropical cyclones formed, all of which became hurricanes, and three
of those four became major hurricanes. Hurricane Irma was also
present in the basin as a major hurricane during the month, although
it formed in late August. Both Irma and Maria reached category 5
intensity during the month of September.
Based on a 30-year climatology (1981-2010), the number of named
storms forming in the basin during September was near average, but
the numbers of hurricanes and major hurricanes were both well above
average. In terms of the Accumulated Cyclone Energy (ACE), which
measures the combined strength and duration of tropical storms and
hurricanes, September 2017 was the most active month on record,
easily breaking the previous record of September 2004. Overall,
this September was about 3.5 times more active than an average
September from 1981-2010.
From a seasonal perspective, activity in the Atlantic basin so far
in 2017 is well above average, and this season is the 3rd most
active on record to date in the basin, behind 1933 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 6- 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
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* Denotes a storm for which the post-storm analysis is complete.
$$
Hurricane Specialist Unit |
