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Atlantic Tropical Monthly Summary

Active Tropical Systems Basin Outlooks Satellite
September 2012 Atlantic Monthly Summary
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ABNT30 KNHC 011244

800 AM EST SUN NOV 01 2015

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

No tropical cyclones formed in the Atlantic basin during the month
of October. Joaquin was a major hurricane that was ongoing at the
beginning of the month.  Joaquin strengthened into a category 4
hurricane later that day and maintained that intensity until 2
October when it weakened to just below category 4 status. Joaquin
re-intensified on 3 October to just below category 5 strength while
moving slowly southwestward into the central Bahamas, killing 34
people. Joaquin moved northeastward and steadily weakened as it
passed just west of Bermuda on 5 October and became an extratropical
low over the far North Atlantic on 7 October.  Based on a 30-year
(1981-2010) climatology, two named storms typically form in the
Atlantic basin in October, with one becoming a hurricane. A major
hurricane forms in October once every other year.

In terms of Accumulated Cyclone Energy (ACE), which measures the
combined strength and duration of tropical storms and hurricanes,
activity in the Atlantic basin through October has only been about
58 percent of the 30-year average.

Reports on individual cyclones, when completed, are available at the
National Hurricane Center website at .

Summary Table

Name                 Dates         Max Wind (mph)
TS Ana*             8-11 May            60
TS Bill*           16-18 Jun            60
TS Claudette*      13-14 Jul            50
MH Danny           18-24 Aug           115
TS Erika           25-29 Aug            50
H  Fred         30 Aug-6 Sep            85
TS Grace             5-9 Sep            50
TS Henri*           8-11 Sep            50
TD Nine            16-19 Sep            35
TS Ida             18-27 Sep            50
MH Joaquin      28 Sep-7 Oct           155

* Denotes a storm for which the post-storm analysis is complete.

Hurricane Specialist Unit