A tropical depression has formed in the Pacific and slow strengthening is expected over the next couple of days, the National Hurricane Center said.

MIAMI — Hurricane Gabrielle formed Sunday in the open Atlantic southeast of Bermuda, while Tropical Storm Narda emerged well off southern Mexico’s Pacific coast.

Tropical Storm Mario has formed off the Pacific coast of Mexico. Forecasters say it could bring wind, rain, and possible flash flooding. The National Hurricane Center described Mario as

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