Southern United States in mid and late-September, none of the other depressions caused significant effects of land. Collectively, the tropical cyclones of the season resulted in $4.12 billion in damage and at least 2,136 deaths. Seasonal summary The Atlantic hurricane season officially began on June 1, 1979. Although 26 tropical systems were observed, only 16 reached the level of tropical or subtropical depression, and nine of them reached tropical storm intensity, which is slightly below the 1950-2000 average of 9.6 named storms per season. Of the nine tropical storms, five of them strengthened into a hurricane, which is also slightly below average. Two of the five hurricane became major hurricanes, which is Category 3 or greater on the Saffir–Simpson hurricane wind scale. Three tropical storms, one hurricane-strength subtropical storm, and three hurricanes made landfall during the season and caused at least 2,136 fatalities and $4.12 billion. Despite its intensity, Tropical Depression One also resulted in damage and deaths due to severe flooding in Jamaica. The last storm of the season, an unnumbered tropical depression, dissipated on November 15, about 15 days before the official end of hurricane season on November 30. Tropical cyclogenesis began in June, with three tropical depressions, one of which strengthened into Tropical Storm Ana. A total of four systems formed in the month of July, including Hurricane Bob and Tropical Storm Claudette. Activity briefly halted after Tropical Depression Six dissipated on August 6 and lasted until Hurricane David developed on August 25. There were four other tropical cyclones that month, including Hurricane Frederic and Tropical Storm Elena. In September, six systems developed, with the named storms of the month being hurricane Gloria and Henri. October was slightly less active, with four tropical cyclones, one of which was an unnamed subtropical storm. Two additional tropical depressions developed in November, the second of which dissipated on November 15. The season's activity was reflected with an accumulated cyclone energy (ACE) rating of 93. ACE is a metric used to express the energy used by a tropical cyclone during its lifetime. Therefore, a storm with a longer duration will have high values of ACE. It is only calculated at six-hour increments in which specific tropical and subtropical systems are either at or above sustained wind speeds of 39 mph (63 km/h), which is the threshold for tropical storm intensity. Systems Tropical Depression One A tropical wave in the western Caribbean