The table on the right shows the ACE for each storm in the season. ACE is a measure of the power of the hurricane multiplied by the length of time it existed, so storms that last a long time, as well as strong hurricanes, have high ACEs. ACE is only officially released for full advisories on tropical systems at or exceeding 34 knots (39 mph, 63 km/h) or tropical storm strength. Subtropical storms are not included in season totals.