LES CAYES, Haiti - Tropical Storm Grace swept over Haiti with drenching rains just two days after a powerful earthquake battered the impoverished Caribbean nation, adding to the misery of thousands who lost loved ones, suffered injuries or found themselves homeless and forcing overwhelmed hospitals and rescuers to act quickly.After nightfall, heavy rain and strong winds whipped at the country's southwestern area, hit hardest by Saturday's quake, and officials warned that rainfall could reach 15 inches (38 centimeters) in some areas before the storm moved on.