The National Hurricane Center is watching Tropical Storm Mario in the Pacific and two other potential storms.

Tropical Storm Mario, a small cyclone, is strengthening off the west coast of Mexico Friday. It's about 20 nautical miles off the coast of Guerrero, Mexico.

Mario, a storm system swirling off Mexico's Pacific coast, has once again become a tropical storm. There are no coastal watches or warnings in effect.

The National Hurricane Center is watching Tropical Storm Mario in the Pacific and two other potential storms.

Tropical Storm Gabrielle could form this week, while Mario could bring rain to Southern California in the Pacific.