MIAMI (AP) — Tropical Storm Erin has formed well off the U.S. East Coast as Tropical Storm Dorian takes aim at Puerto Rico, the Bahamas and Florida.

The National Hurricane Service says the storm is forecast to move northward and north eastward over the open Atlantic with no threat to land.

Erin is drifting toward the west near 2 mph (3 kph). The storm is expected to begin moving northward Tuesday night and northeastward Wednesday with an increase in forward speed. Erin 690 miles (1110 kilometers) west of Bermuda and 300 miles (482 kilometers) southeast of Cape Hatteras, North Carolina, with maximum sustained winds of 40 mph.

Dorian is expected to gain strength before reaching Puerto Rico on Wednesday where a hurricane watch is in effect before heading toward the Bahamas on Thursday and Florida over the weekend.

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This story has been corrected to change storms location from nearing Puerto Rico to its distances from Bermuda and North Carolina.