In barely a day, hurricane Polo, which formed in late September in the Pacific off the coast of Mexico, reached the highest category — level 5, corresponding to winds above 252 kilometers (156 mph) per hour. It was the second most powerful tropical cyclone recorded in the Pacific to date. Polo later weakened before making landfall as a storm — at category 2 — in Baja California Sur, Mexico. It left behind torrential rains, floods and infrastructure damage in northwest Mexico and the southwestern United States, and five deaths linked to those floods in Mexico.