On August 11

On August 11, 2007, a tropical wave moved off the west coast of Africa,[4] and, encountering favorable conditions,[5] quickly developed into Tropical Depression Four about 520 miles (835 km) west-southwest of Cape Verde on August 13.[6] The depression moved briskly westward,[7] and was upgraded to Tropical Storm Dean at 1500 UTC on August 14.[8] The storm's intensity continued to build[9] although dry air and cooler air inflow from the north were slowing structural development. Ragged bands formed on August 15[10] and the formation of a partial eyewall was observed later that day.[11]


Image of Hurricane Dean at category 5 hurricane strength on August 18, 2007.
Intensification continued[12] and the storm was upgraded to Hurricane Dean at 5 a.m. EDT (0900 UTC) August 16.[13] The deep-layered ridge to the north continued to steer the system west, towards the Caribbean Sea.[14] The storm quickly strengthened to a Category 2 hurricane on the Saffir-Simpson Hurricane Scale.[15][16] The storm's development slowed slightly but[17] a reconnaissance aircraft discovered a closed eyewall on August 17 as the storm passed through the Lesser Antilles.[18] Data from the aircraft indicated that Hurricane Dean had strengthened to a Category 3 hurricane[19] and its trailing bands were still over the Lesser Antilles.[20] During the evening of August 17, Dean strengthened into a Category 4 hurricane[21] and continued to steadily grow in both size and intensity through the night.[22] On August 18 the presence of a double eyewall was noted,[23] indicating an eyewall replacement cycle and causing short term fluctuations in intensity.[24] These fluctuations did not affect the storm's well defined satellite presentation.[23] Operationally, Dean was thought to have only been a Category 4 on the 18th, but post-storm analysis shows that Dean had become a 165 miles per hour (265 km/h) Category 5 that day. Dean weakened very slightly on the morning of August 19 as it finished the eyewall replacement cycle and began to interact with the island of Jamaica[25]


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