tracking west-northwest

On September 11, a vigorous tropical wave moved off the west coast of Africa. The wave organized rapidly and spawned a tropical depression to the south-southeast of Cape Verde. On September 14, the depression intensified into Tropical Storm Helene while tracking west-northwest. Helene continued to intensify and was upgraded to a hurricane on September 16. The storm began to execute a northward track, and reached Category 3 hurricane status on the Saffir-Simpson hurricane scale on September 18, before reaching its peak intensity of 120 mph (195 km/h). It started to weaken when it reached the cold waters of the North Atlantic, and Helene dissipated on September 20, without having had major effects on land other than moderate wind gusts in the British Isles.[41]
[edit] Hurricane Isaac
Category 1 hurricane (SSHS)

Duration September 27 – October 2
Intensity 85 mph (140 km/h) (1-min) 985 mbar (hPa; 29.09 inHg)
Main article: Hurricane Isaac (2006)

Hurricane Isaac originated in a tropical wave that moved off the coast of Africa on September 18. The wave tracked west, produced a tropical depression, and became a tropical storm on September 28. Isaac moved north-northwest and was upgraded to a hurricane on September 30. It turned north and reached its peak intensity of 85 mph (135 km/h) before weakening and brushing Nova Scotia.[16] Isaac produced moderate winds on land in Newfoundland, peaking at 60 mph (96 km/h) with a sustained wind of 46 mph (74 km/h) was recorded.[42]




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