A westward-moving tropical wave could produce an area of low pressure in the tropical Atlantic late in the week of Aug. 18, the hurricane center said on Aug. 16. The center shows a 20% chance of storm formation over the next week.

The National Hurricane Center is tracking two systems in the Atlantic basin, including Invest 98L, which could become a tropical depression before moving onshore in either Mexico or southern Texas.

With maximum wind speeds back down to 125 mph, Erin remains a Category 3 storm, but is expected to strengthen again in the next few days. NHC said the storm is getting bigger, with hurricane-force winds extending 25 miles from the center and tropical storm-force winds extending up to 205 miles.