Northeast gets clobbered by late-season storm

NEW YORK — A sloppy, blustery late-season storm lashed the Northeast with sleet and more than a foot of snow in some places Tuesday, paralyzing much of the Washington-to-Boston corridor after a remarkably mild February had lulled people into thinking the worst of winter was over.The powerful nor'easter grounded nearly 6,000 flights, knocked out power to nearly a quarter-million customers from Virginia northward, closed schools in cities big and small and prompted dire warnings to stay off