MIAMI (CBSMiami) – Tropical Storm Dorian is expected to become a hurricane by the time it approaches Puerto Rico on Wednesday.

The National Hurricane Center issued a Tropical Storm watch for Puerto Rico on Monday afternoon.

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Hurricane conditions are possible across the northern Windward Island late Monday as Dorian makes its approach.

At 11 p.m., the center of the storm was about 95 miles east-southeast of St. Lucia.

It was moving to the west-northwest at 13 mph with maximum sustained winds of 50 mph.

Dorian is forecast to continue moving toward the west-northwest through Tuesday night, followed by a turn toward the northwest on Wednesday.

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Dorian could be near hurricane strength when it passes through the northern Windward Islands on Tuesday.

SUMMARY OF WATCHES AND WARNINGS IN EFFECT:

A Hurricane Watch is in effect for…
* St. Lucia

A Tropical Storm Warning is in effect for…
* Barbados
* Martinique
* St. Lucia
* St. Vincent and the Grenadines

A Tropical Storm Watch is in effect for…
* Dominica
* Grenada and its dependencies
* Saba and St. Eustatius
* Puerto Rico

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Dorian is expected to produce 3 to 8 inches of rain in the Windward Islands from Martinique south to St. Vincent, including Barbados. Isolated maximum totals of 10 inches are possible across the northern Windward Islands. Rainfall totals of 1 to 3 inches are expected from the Grenadines, south to Grenada and across Dominica.