Gamma, along with cold fronts, combined over the weekend to cause extreme rains in parts of the Yucatan Peninsula and Chiapas, affecting more than half a million people.

A storm might hit the U.S. as a hurricane after running across Mexico's Yucatan Peninsula.

Tropical Storm Genevieve remained offshore from Mexico's southern Baja California peninsula while sweeping the coast with strong winds and rain that carried the threat of dangerous flooding.

The victims were either electrocuted or drowned while trying to cross streams, authorities said.