Barry developed. The former also became the most intense tropical cyclone of the season, peaking as a Category 3 hurricane with maximum sustained winds of . Alicia caused 21 fatalities and approximately $3 billion in damage, mostly in Texas. Three tropical cyclones formed in September – Hurricane Chantal, Tropical Depression Six, and Tropical Storm Dean. The dissipation of Dean on September 30 marked the end of tropical cyclone activity. The season's activity was reflected with a very low cumulative accumulated cyclone energy (ACE) rating of 17, one of the lowest on record, which is classified as "below normal". ACE is a metric used to express the energy used by a tropical cyclone during its lifetime. Therefore, storms that last a long time, as well as particularly strong hurricanes, have high ACEs. It is only calculated for full advisories on tropical systems at or exceeding , which is the threshold for tropical storm intensity. Systems Tropical Depression One Tropical Depression One developed about halfway between French Guiana and the Cape Verde Islands on July 23. The National Hurricane Center indicated the possibility of the depression strengthening into a tropical storm in media reports, but upper-level wind shear inhibited any development. The depression dissipated over the eastern Caribbean late on July 28. Tropical Depression Two An area of disturbed weather organized into a tropical depression southwest of the Cape Verde Islands on July 27. The depression moved generally west-northwestward across the deep Atlantic for several days, but failed to strengthened significantly due to strong upper-level wind shear. The depression dissipated near the northern Leeward Islands on August 2. Hurricane Alicia The system that would become Hurricane Alicia originated from the western end of a frontal trough that stretched from New England to the Gulf of Mexico. Satellite pictures showed a meso-scale low-pressure area that had moved off the Alabama and Mississippi coasts near the trough and was possibly the precursor system to Alicia. Pressures in the Gulf of Mexico were high and stayed high during the early development stages. On August 15, a ship recorded a minimal pressure of 1015 millibars (29.99 inHg), when the system was upgraded into Tropical Storm Alicia. With high environmental pressures around it, Alicia remained a small system. Steering currents above Alicia remained weak during the storm's lifetime. However, a ridge was well formed to the north of the developing storms. With fluctuations in the pressures, Alicia