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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.
With 10-minute sustained winds of 160 mph (260 km/h), Typhoon Tip is the strongest cyclone in the complete tropical cyclone listing by the Japan Meteorological Agency. [ 4 ] The typhoon was also the most intense tropical cyclone on record, with a pressure of 870 mbar (25.69 inHg), 5 mbar (0.15 inHg) lower than the previous record set by Super ...
The season's activity was reflected with an accumulated cyclone energy index of 141 units, [19] which was well above the 1981–2010 median of 92, [20] as well as the highest value since 2010. [19] The year opened up with an anomalous storm in January: Hurricane Alex, the first such system to develop in January since 1938. [21]
2 Seasons table: proposal for slightly more user-friendly arrangement and corrections
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.
It also generated the most accumulated cyclone energy for a single storm, until Cyclone Freddy surpassed its record in 2023. Ioke was the ninth named storm, fifth hurricane, and third major hurricane of the active 2006 Pacific hurricane season. The cyclone developed in the Intertropical Convergence Zone on August 20 far to the south of Hawaii.
On April 8, TSR updated their prediction, predicting 23 tropical storms, 11 hurricanes, and five major hurricanes, with an accumulated cyclone energy (ACE) index of 217 units. They predicted that moderate La Niña conditions would occur in the summer and persist into fall and above average sea surface temperatures would also persist into summer ...
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 ...