MONTAUK, N.Y. (AP) - Creating havoc even at half-strength, Tropical Storm Floyd raced into the Northeast with gusty winds and torrential rain Thursday, grounding hundreds of flights, closing school for 3 million students, even postponing a U.N. meeting on war. Drenching much of the East Coast, Floyd raced across Long Island and into New England after rolling through the Carolinas in the morning. By 11 p.m., its winds had fallen below hurricane force to 60 mph. At least 12 deaths were blamed on Floyd, eight from traffic accidents in the Carolinas and Virginia. Two girls in Delaware drowned after a storm-swollen creek swept them into a sewage pipe, a woman was killed in Virginia when a tree fell on her mobile home, and one man was presumed drowned in the Bahamas.