The U.S. National Hurricane Center says two tropical storms have gathered strength off Mexico’s Pacific coast Monday, with one forecast to become a hurricane later in the day. Early on Monday,

The storms are expected to become weaker in the coming days, but another tropical depression is forecasted to form later in the week.

Barbara was a tropical storm in the North Pacific Ocean early Monday Mountain time, the National Hurricane Center said in its latest advisory. The tropical storm had sustained wind speeds of 70 miles per hour.