Accumulated Cyclone Energy (ACE)

East Pacific
West Pacific
Indian Ocean
Southern Hemisphere

Updated: July 25, 2016

Average year:
2016 year-to-date:

Atlantic Tropical Cyclones of 2016

Tropical Cyclone Name Start Date Max Wind Speed (kt) ACE (104 kt2)
ALEX January 13, 2016 75 3.1525
BONNIE May 28, 2016 40 1.0175
COLIN June 05, 2016 45 1.215
DANIELLE June 20, 2016 40 0.4425

East Pacific Tropical Cyclones of 2016

Tropical Cyclone Name Start Date Max Wind Speed (kt) ACE (104 kt2)
ONE June 20, 2016 0 0
AGATHA July 02, 2016 40 1.1675
BLAS July 03, 2016 115 19.3025
CELIA July 08, 2016 85 10.1925
DARBY July 12, 2016 100 21.685
ESTELLE July 16, 2016 60 7.4125
FRANK July 21, 2016 60 4.8475
GEORGETTE July 22, 2016 115 8.5975

10 Things We Know About Accumulated Cyclone Energy

1. There is no evidence of a systematic increasing or decreasing trend in ACE for the years 1970-2012.

2. There is a cyclical variation in the ACE of 6 and 12 months' length.

3. The contribution of ACE from the Eastern and Western Pacific is approximately 56% of the total ACE.

4. The contribution of ACE from the Atlantic Ocean is approximately 13% of the total ACE.

5. The minimum and maximum values of ACE per month are respectively 1.8 and 266.4.

6. The average value of ACE per month is 61.2.

7. The minimum and maximum values of ACE per year are respectively 416.2 and 1145.0.

8. The average value of the ACE per year is 730.5.

9. The total of ACE for 2012 through September is 540.8.

10. There is a correlation of ACE between some oceans.

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What is Accumulated Cyclone Energy?

Accumulated cyclone energy, or "ACE," is used to express the activity and destructive potential of individual tropical cyclones and entire tropical cyclone seasons. ACE is calculated as the square of the wind speed every 6 hours, and is then scaled by a factor of 10,000 for usability. The ACE of a season is the sum of the ACE for each storm and takes into account the number, strength, and duration of all the tropical storms in the season. The caveat to using ACE as a measure of the activity of a season is that it does not take the size of the hurricane or tropical storm into account. The damage potential of a hurricane is proportional to the square or cube of the maximum wind speed, and thus ACE is not only a measure of tropical cyclone activity, but a measure of the damage potential of an individual cyclone or a season.

Hurricane Archive

All Atlantic Storms (1851-2016)

Named Storms for 2016

Historical Hurricane Statistics

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