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The HDP index was later modified to further include tropical storms, that is, all wind speeds of at least 34 knots (≥ 63 km/h; 39 mph), to become the accumulated cyclone energy index. The highest ACE calculated for a single tropical cyclone on record worldwide is 87.01, set by Cyclone Freddy in 2023.
An important measure of the total seasonal activity is NOAA's Accumulated Cyclone Energy (ACE) index, which accounts for the combined intensity and duration of all named storms and hurricanes during the season. This 2021 outlook indicates a 70% chance that the seasonal ACE range will be 110%-190% of the median.
Nov 1, 2023 · Web update: April 2021. Figure 2. North Atlantic Tropical Cyclone Activity According to the Accumulated Cyclone Energy Index, 1950–2020. This figure shows total annual Accumulated Cyclone Energy (ACE) Index values, which account for cyclone strength, duration, and frequency, from 1950 through 2020.
The Atlantic basin Accumulated Cyclone Energy (ACE) and Net Tropical Cyclone (NTC) activity are predicted to be about 170% of their long-term averages (1991-2020). The forecast team is forecasting 23 named storms, 11 hurricanes, 5 major hurricanes, and an Accumulated Cyclone Energy of 210 (the average is 123).
Accumulated cyclone energy (ACE) is an index used to measure the activity of a cyclone/hurricane season. It combines the number of hurricane systems, how long they existed and how intense they became.
Mar 9, 2023 · The Accumulated Cyclone Energy – the ACE index – is a metric used to express the energy a tropical cyclone uses during its lifetime. The calculation takes a tropical cyclone’s maximum sustained winds every six hours and multiplies it to generate the values.
2 days ago · The global accumulated cyclone energy (ACE: an integrated metric of the strength, frequency, and duration of tropical storms) was about 22% below the 1991-2020 average. Similar to 2020, the North Atlantic played an out-sized role in the global tropical cyclone activity in 2021. The 21 named storms were the third most on record.
