Skip Navigation Links
NOAA NOAA United States Department of Commerce

Monthly Atlantic Tropical Weather Summary

ABNT30 KNHC 011242

Monthly Tropical Weather Summary
NWS National Hurricane Center Miami FL
800 AM EDT Wed Sep 1 2021

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

Tropical cyclone activity in the Atlantic basin during August was 
above normal in terms of the numbers of named storms, hurricanes, 
and major hurricanes.  Six named storms formed in the Atlantic basin 
in August, with three of them becoming hurricanes, and two of those 
becoming major hurricanes.  Grace was a category 3 hurricane when it 
made landfall just south of Tuxpan, Mexico, on 22 August, and Ida 
was a category 4 hurricane when it made landfall near Port Fourchon, 
Louisiana, on 29 August.  One tropical depression formed on the last 
day of the month.  Based on a 30-year climatology (1991-2020), 3 or 
4 named storms typically develop in August, with one or two of them 
becoming hurricanes.  A major hurricane forms in August every 1 to 2 

In terms of Accumulated Cyclone Energy (ACE), which measures the 
strength and duration of tropical storms and hurricanes, activity 
in the basin so far in 2021 is above normal, almost 25 percent 
above the long-term mean.  The 11 named storms through the end of 
August is well above the 30-year (1991-2020) average of 6 to 7 
named storms by the end of the month.

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

Summary Table

Name                  Dates          Max Wind (mph)
TS Ana              22-23 May           45*
TS Bill             14-16 Jun           60
TS Claudette        19-22 Jun           45
TS Danny            28-29 Jun           45
H  Elsa               1-9 Jul           85
TS Fred             11-18 Aug           65
MH Grace            13-21 Aug          125
H  Henri            16-23 Aug           75
MH Ida              26 Aug-            150
TS Kate             28 Aug-             45
TS Julian           29-30 Aug           60
TD Twelve           31 Aug-             35

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

Hurricane Specialist Unit