Tropical Storm Michael could bring heavy rainfall to Mexico, Cuba, Gulf Coast

A tropical depression strengthened on Sunday into Tropical Storm Michael, which the National Hurricane Center says could bring heavy rainfall and flooding to Mexico, Cuba and the U.S. Gulf Coast.A tropical storm warning is in effect for the Cuban provinces of Pinar del Rio and the Isle of Youth. There's also a warning in effect for the coast of Mexico from Tulum to Cabo Catoche.Forecasters said the storm could become a hurricane by Tuesday night or Wednesday. The storm could bring rainfall total