ISAAC HUGS CUBA’S NORTH COAST, HEADING TO FLORIDA KEYS

At 5 PM EST, Tropical Storm ISAAC was centered 400 miles southeast of Miami, moving northwest 21 mph. Peak winds are 60 mph.

As ISAAC moves towards the northwest along the northern coast of Cuba, a secondary circulation center between Jamaica and the Caymans will interact with ISAAC causing the two centers to attempt to rotate around each other. This should ISAAC to temporarily change to a more westerly course for the next 24 to 30 hours, then resume a movement towards the northwest.

This reminds me of the Fujiwhara where two adjacent cyclones causes them to appear to rotate around each other. I described this effect in 1964 when Hurricane Ethel in the central Atlantic appeared to be approaching Hurricane Dora south of Bermuda possibly boosting Dora more towards Florida.

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