Talk:2009 Pacific hurricane season/ACE calcs

This is the page for calculating the Accumulated Cyclone Energy for the 2009 Pacific 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.

01E.NONAME
Since Tropical Depression One-E never strengthened into a tropical storm, it has an ACE of 0.

09E.NONAME
Since Tropical Depression Nine-E never strengthened into a tropical storm, it has an ACE of 0.

01C.Maka

 * Note: the Western Pacific portion is not included.

02C.NONAME
Since Tropical Depression Two-C never strengthened into a tropical storm, it has an ACE of 0.

Season total
Figures in parenthesis relate to activity in the Central Pacific basin, west of 140°