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Accumulated cyclone energy is calculated by summing the squares of the estimated maximum sustained velocity of tropical cyclones when wind speeds are at least tropical storm strength (≥ 34 kn; 63 km/h; 39 mph) [4] at recorded six-hour intervals. The sums are usually divided by 10,000 to make them more manageable.
A very intense tropical cyclone is the highest category on the South-West Indian Ocean Tropical Cyclone scale, and has winds of over 115 knots (213 km/h; 132 mph). At the tenth RA I tropical cyclone committee held during 1991, it was recommended that the intensity classifications be changed ahead of the 1993–94 tropical cyclone season.
A tropical cyclone's maximum sustained wind and minimum central air pressure are interlinked and can be used to describe a tropical cyclone's intensity. [ 2 ] [ 3 ] While the maximum winds are more closely related to the destructive potential of a tropical cyclone, it is harder to reliably measure. [ 1 ]
An extratropical cyclone can transform into a subtropical storm, and from there into a tropical cyclone, if it dwells over warm waters sufficient to warm its core, and as a result develops central convection. [37] A particularly intense type of extratropical cyclone that strikes during winter is known colloquially as a nor'easter.
While the number of tropical storms and hurricanes that form each year is important to track, experts say that the Accumulated Cyclone Energy (ACE) index is a more reliable way to quantify the ...
English: Chart showing Accumulated Cyclone Energy Index compared to 30-year average Data source: 2024's record-breaking, destructive Atlantic hurricane season ends. Axios (27 November 2024). Archived from the original on 1 December 2024. "Data: Colorado State University"
The year 1992 featured the highest amount of accumulated cyclone energy (ACE) on record, with an ACE rating of 1,163.1 units. [1] It would be regarded as one of the most intense tropical cyclone years on record. Throughout the year, 111 tropical cyclones formed, of which 101 were given names by various weather agencies.
Is there any viable calculation as to the power output of a cyclone versus say a volcano or earthquake. I would like more data on how Mother Nature is hugely bigger than most 'human' activities. The typical diagram for 'energy' has 'large lightning' and a storm has thousands; often with has Mt St Helens and 'one day of a hurricane'.