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(CNN) — Tropical Storms Karen, Jerry and Lorenzo are spinning across the Atlantic Basin Monday and two of the storms threatened islands.

Tropical Storm Karen could weaken but still poses a threat

Karen continues to track across the Caribbean toward Puerto Rico and the US Virgin Islands.

The storm is packing 40 mph winds and moving northwest at 8 mph. It will take a more northerly direction by early Tuesday and tropical-storm-force winds could arrive by midday in Puerto Rico.

The storm formed early Sunday near Grenada and passed between the island and St Vincent and the Grenadines Sunday morning.

By Monday morning, the storm took a turn to the North and prompted the National Hurricane Center to issue a Tropical Storm Warning for Puerto Rico, the US Virgin Islands, and the British Virgin Islands.

A Tropical Storm Warning means that tropical storm conditions are expected somewhere within the warning area, within the next 36 hours.

The storm could bring enough rain to cause flash flooding and mudslides, especially in mountainous areas.

Rainfall of 2-4 inches, even isolated storm totals of 8 inches, could fall across the islands.

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

Tropical Storm Jerry moves toward Bermuda

Tropical Storm Jerry is still in the Atlantic and generally moving north-northwest. The storm is expected to turn back toward the Northeast and could come close to Bermuda.

Tropical-storm-force winds could arrive as early as Tuesday afternoon.

A Tropical Storm Warning has been issued for the island. Large swells are also expected to affect the coast of “Bermuda during the next few days,” stated the National Hurricane Center. “These swells could cause life-threatening rip currents.”

Tropical Storm Lorenzo forms near Africa

On the other side of the Atlantic, Tropical Storm Lorenzo has formed a few hundred miles southeast of the Cabo Verde Islands.

It’s heading “generally westward” over the Atlantic at about 18 mph.

It is expected to begin moving northwestward Monday night and remain on this track through the middle of the week.

(Photo by CNN.)