Seasonal Forecast and Summary
Dr. William M. Gray of Colorado State University issued forecasts on May 29 and July 28 indicating within both forecasts the anticipation of a below normal hurricane season. In May, a total of 8 named tropical storms were expected, with four hurricane expected, 15 days with hurricanes, and a total of 35 days with a tropical storm active in the northern Atlantic ocean. In July, the numbers were dropped to a total of 7 named storms, 4 hurricanes, 10 hurricane days, and 25 days with a named tropical storm, which almost perfectly verified.
The season's activity was reflected with a cumulative accumulated cyclone energy (ACE) rating of 36, which is classified as "below normal". ACE is, broadly speaking, 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 particularly strong hurricanes, have high ACEs. ACE is only calculated for full advisories on tropical systems at or exceeding 34 knots (39 mph, 63 km/h) or tropical storm strength. Subtropical cyclones are excluded from the total.
Read more about this topic: 1986 Atlantic Hurricane Season
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