Isaac originated

While Hurricane Helene was spinning in the central Atlantic, a tropical wave that moved off the coast of Africa in late September rapidly organized. On September 27 the storm became the 15th tropical depression of the season while it was about 265 mi (426 km) south-southeast of Cape Verde.[53] The depression tracked westward at 15 to 20 mph (32 km/h) but weakened rapidly. The next day it was downgraded to a tropical wave while still in the far eastern Atlantic, and never reformed in the Atlantic.[3] The system remained far from any landmasses throughout its life.
[edit] Tropical Storm Isaac
Tropical storm (SSHS)

Duration September 28 – October 1
Intensity 45 mph (75 km/h) (1-min) 1005 mbar (hPa; 29.68 inHg)
Main article: Tropical Storm Isaac (1988)

Isaac originated as a disturbance near the western coast of Africa on September 23. The storm traveled westward at a low latitude along the Intertropical Convergence Zone (or ITCZ), and its convection gradually grew more organized.[54] On September 29 it was identified as Tropical Depression Sixteen about 900 mi (1,400 km) southeast of Barbados. The westward path of the storm shifted two degrees northward, possibly as a result of the formation of a new center. On September 30 the depression was upgraded when an Air Force reconnaissance plane discovered tropical storm-force winds.[4]

Westerly vertical wind shear prevented deep convection at the center of the storm. As Isaac approached the islands, northern parts of the Lesser Antilles were issued tropical storm warnings.[4] Nevertheless the storm lasted only a short time in the shearing environment. Isaac was downgraded to a depression on October 1 and completely dissipated shortly thereafter.[54] No damage or casualties were reported. The remnants of Isaac eventually regenerated in the eastern Pacific Ocean basin as Tropical Depression Twenty-E.[55]



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