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Monthly Atlantic Tropical Weather Summary

ABNT30 KNHC 011139

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 .

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

Preliminary Atlantic Tropical Cyclone Tracks
Preliminary Atlantic Tropical Cyclone Tracks