Westerly windshear, which had been on the decline in the northern Caribbean Sea, is on the increase again. A large and strong upper level low well to the east northeast of Bertha is dropping to the south and compressing the Atlantic ridge. The shear zone roughly extends from 14N to 20N and from 80W eastward to 45W. In addition, uncommonly strong easterly shear is developing over west Africa and extends just off the coast. Tropical Waves of Cape Verde origin are going to have a rough time of it for awhile.
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