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 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

Preliminary Atlantic Tropical Cyclone Tracks
Preliminary Atlantic Tropical Cyclone Tracks