A low-pressure area forming over the Atlantic could become the first tropical storm of the season, the National Hurricane Center warned Monday."There remains a high chance, 60 percent, of this system becoming a tropical cyclone during the next 48 hours," the center said in a statement, as officials anxiously eye weather reports.A major storm could push oil-tainted water from the Gulf of Mexico spill further ashore or into new states, and bring more misery to earthquake-ravaged Haiti where hundreds of thousands still live in precarious conditions.