FIG. 28. Accumulated Cyclone Energy (ACE) Index indicating overall Atlantic basin
tropical storm and hurricane activity for each June–November season between 1950 and
1999. The ACE index is calculated by summing the squares of the 6-hourly maximum sustained
wind speed (Vmax2) for all named storms during their existence as a tropical
storm or hurricane. Seasonal index values have been divided by 100,000 for display
purposes only.
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