Puerto Rico and the US Virgin Islands, under alert for tropical storm Karen

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(CNN) - Tropical storm Karen formed this Sunday and a tropical storm warning was issued for St. Vincent and the Grenadines, along with Grenada and its territories, the United States National Hurricane Center (NHC) said. English).

Karen was about 160 miles (260 kilometers) west of San Vicente, with maximum sustained winds of 40 mph (65 km / h), the center said in its most recent announcement, early Monday.

A tropical storm warning means that tropical storm conditions are expected somewhere within the warning area.

A tropical storm alert was issued for the US Virgin Islands. UU., Puerto Rico, including Vieques and Culebra, and the British Virgin Islands, according to the notice. Karen is forecast to continue moving west-northwest on Sunday, away from the Windward Islands, and cross the eastern Caribbean Sea on Sunday night and Monday.

The storm could carry enough rain to cause flash floods and landslides, especially in mountainous areas, on the Windward and Leeward Islands, the center said.

On Tuesday, Karen is expected to "pass near or over" Puerto Rico and the Virgin Islands as a tropical storm, the center said.

On the other side of the Atlantic, a low pressure system a few hundred miles southeast of the Cape Verde Islands has a 90% chance of becoming a tropical depression or tropical storm on Sunday or Monday night, the center said. . It is "generally westbound" over the Atlantic at approximately 15 to 20 mph.

Trinidad and Tobago is no longer under a tropical storm warning, the center said.

Theresa Waldrop of CNN contributed to this report.