Tropical Depression Three-E formed in the Eastern Pacific on Sunday morning and is expected to strengthen into Tropical Storm Cosme in a matter of hours.

Tropical Storm Barbara formed off the southern coast of Mexico on Sunday morning, and forecasters say it's expected to become the first hurricane of the season in the Eastern Pacific.

A tropical storm is a tropical cyclone that has maximum sustained winds between 39 and 73 mph – an upgrade from a tropical depression.

The National Hurricane Center said that Tropical Storm Barbara reached 40 mph, officially designating it as a tropical storm.

Two areas of thunderstorms off the western Mexican coast could eventually become tropical storms Barbara and Cosme.

The National Hurricane Center started issuing advisories on potential tropical cyclones in 2017. Here’s what they are and how ...

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