Talk:2009 Atlantic hurricane season/ACE calcs

This is the page for calculating the Accumulated Cyclone Energy for the 2009 Atlantic hurricane season.

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.


 * $$\sum_{}^{} \frac{{v_\mathrm{max}}^2}{10^4},$$

where vmax is estimated sustained wind speed in knots.

01L.NONAME

 * Never strengthened into a tropical storm, ACE is zero

02L.Ana

 * From 5 pm AST on August 13 to 12:30 am AST on August 15, the system was a low, not a tropical cyclone.

08L.NONAME

 * Never strengthened into a tropical storm, ACE is zero

01L.NONAME

 * Tropical Cyclone Report
 * Never strengthened into a tropical storm, ACE is zero

02L.Ana

 * Tropical Cyclone Report

03L.Bill

 * Tropical Cyclone Report

04L.Claudette

 * Tropical Cyclone Report

05L.Danny

 * Tropical Cyclone Report

06L.Erika

 * Tropical Cyclone Report

07L.Fred

 * Tropical Cyclone Report

08L.NONAME

 * Tropical Cyclone Report
 * Never strengthened into a tropical storm, ACE is zero

09L.Grace

 * Tropical Cyclone Report

10L.Henri

 * Tropical Cyclone Report

11L.Ida

 * Tropical Cyclone Report