question on ace
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JonathanBelles
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JonathanBelles
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JonathanBelles
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wxmann_91
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I believe this is the formula: (from Wikipedia):
Note (source from Wiki as well):
Note (source from Wiki as well):
The ACE is calculated by summing the squares of the estimated maximum sustained velocity of every active tropical storm (wind speed 35 knots or higher), at six-hour intervals. The numbers are usually divided by 10,000 to make them more manageable. The unit of ACE is 104 kt2, and for use as an index the unit is assumed. If any storms of a season happen to cross years, the storm's ACE counts for the previous year.
Last edited by wxmann_91 on Thu Jun 15, 2006 10:37 pm, edited 1 time in total.
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JonathanBelles
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senorpepr
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Yes, ∑ is the sum of each six-hourly wind speed, in knots, squared.
For Alberto...
40² = 1600
40² = 1600
40² = 1600
45² = 2025
60² = 3600
60² = 3600
60² = 3600
55² = 3025
45² = 2025
35² = 1225
35² = 1225
The ∑ of each of Alberto's six-hourly wind speed, in knots, squared, is 25125. Since ACE is shown in scientific notation (10^4) for simplicity, the ACE for Alberto is 2.5125.
For Alberto...
40² = 1600
40² = 1600
40² = 1600
45² = 2025
60² = 3600
60² = 3600
60² = 3600
55² = 3025
45² = 2025
35² = 1225
35² = 1225
The ∑ of each of Alberto's six-hourly wind speed, in knots, squared, is 25125. Since ACE is shown in scientific notation (10^4) for simplicity, the ACE for Alberto is 2.5125.
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Also there is the HPD that is quite useful which works in the same way as the ACe system but only for hurricanes.
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The posts in this forum are NOT official forecast and should not be used as such. They are just the opinion of the poster and may or may not be backed by sound meteorological data. They are NOT endorsed by any professional institution or storm2k.org. For official information, please refer to the NHC and NWS products
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