000
ABNT30 KNHC 011251
TWSAT
Monthly Tropical Weather Summary
NWS National Hurricane Center Miami FL
800 AM EST Tue Dec 1 2020
For the North Atlantic...Caribbean Sea and the Gulf of Mexico:
Tropical cyclone activity in the Atlantic basin during the month of
November was extremely active, with two tropical cyclones developing
during the month and a third tropical cyclone, Eta, continuing from
the end of October. Two of the storms, Eta and Iota, became major
hurricanes, with Iota becoming the latest observed category 5
hurricane on record in the North Atlantic basin. Both Eta and Iota
made landfall in Nicaragua as major hurricanes in nearly the same
location. Based on a 30-year climatology (1981-2010), a tropical
storm forms in the basin in November every one to two years, a
hurricane forms every other year, and a major hurricane forms every
seven to eight years.
Overall, the 2020 Atlantic hurricane season was extremely active,
with well above normal activity for the season. A record thirty
named storms formed, with thirteen becoming hurricanes and six
becoming major hurricanes - category 3 or higher on the
Saffir-Simpson Hurricane Wind Scale. This compares to the long-term
average of twelve named storms, six hurricanes, and three major
hurricanes. There was also one tropical depression that did not
reach tropical-storm strength. In terms of Accumulated Cyclone
Energy (ACE), which measures the strength and duration of tropical
storms and hurricanes, activity in the Atlantic basin in 2020 was 75
percent above the long-term mean.
A record twelve named storms made landfall in the United States in
2020, with an additional storm, Arthur, not making landfall but
producing tropical storm force winds along the coast of North
Carolina.
Reports on individual cyclones, when completed, are available at
the National Hurricane Center website at
www.hurricanes.gov/data/tcr/index.php?season=2020&basin=atl
Summary Table
Name Dates Max Wind (mph)
---------------------------------------------------
TS Arthur 16-19 May 60*
TS Bertha 27-28 May 50*
TS Cristobal 1-9 Jun 60
TS Dolly 22-24 Jun 45
TS Edouard 4-6 Jul 45
TS Fay 9-11 Jul 60
TS Gonzalo 21-25 Jul 65
H Hanna 23-27 Jul 90
H Isaias 30 Jul-5 Aug 85
TD Ten 31 Jul-1 Aug 35
TS Josephine 11-16 Aug 45
TS Kyle 14-16 Aug 50
MH Laura 20-28 Aug 150
H Marco 20-25 Aug 75
H Nana 1-4 Sep 75
TS Omar 31 Aug-5 Sep 40
H Paulette 7-22 Sep 105
TS Rene 7-14 Sep 50
H Sally 11-17 Sep 105
MH Teddy 12-22 Sep 140
TS Vicky 14-17 Sep 50
TS Wilfred 18-20 Sep 40
SS Alpha 18 Sep 50
TS Beta 17-22 Sep 60
TS Gamma 2-5 Oct 70
MH Delta 4-10 Oct 145
MH Epsilon 19-26 Oct 115
H Zeta 24-29 Oct 110
MH Eta 31 Oct-13 Nov 150
TS Theta 10-15 Nov 70
MH Iota 13-18 Nov 160
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* Denotes a storm for which the post-storm analysis is complete.
$$
Hurricane Specialist Unit