Tropical Storm Bertha approaching the Caribbean

MIAMI (AP) -- Tropical storm warnings have been issued for Puerto Rico, the U.S. and British Virgin Islands and other nearby islands as Tropical Storm Bertha approaches the Caribbean.<br /> <br /> The storm's maximum sustained winds early Friday are near 45 mph (75 kph) with no significant change in strength expected over the next two days.<br /> <br /> In addition to Puerto Rico and the Virgin Islands, tropical storm warnings are in effect for Babados, St. Lucia, Dominica, Vieques and Culebra. A tropical storm watch is in effect for St. Vincent and the Grenadines.<br /> <br /> Bertha is centered about 170 miles (270 kilometers) east of Barbados and is moving west-northwest near 20 mph (31 kph).<br /> <br /> The U.S. National Hurricane Center says Bertha is expected to pass near or north of Barbados Friday afternoon.

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