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