A third named Atlantic storm that formed off the North Carolina coast early on Sunday was forecast to become a hurricane on Monday, the U.S. National Hurricane Center said, while Tropical Storm Beryl looked set to threaten Puerto Rico.
Off the U.S. East Coast, Tropical Storm Chris was centered about 160 miles (260 kilometers) south of Cape Hatteras, with maximum sustained winds of 45 mph (75 kph).
As of 5 p.m. Sunday, Chris remained stationary and was not expected to move in the next few days.
As the storm is positioned over very warm ocean waters, it is forecast to steadily strengthen over the next 72 hours and become a hurricane between Tuesday and Wednesday.
Tropical Storm Beryl, downgraded from a category one hurricane, remains on a slow course towards the Lesser Antilles.
No coastal watches or warnings are effect because of Chris.
As of 5 p.m., Beryl was about 60 miles northeast of Martinique and about 70 miles east-southeast of Dominica, according to meteorologists.
Dominica and Guadeloupe remain on tropical storm warning while Martinique, St Martin, St Barthelemy, Saba, St Eustatius and St Maarten are on tropical storm watch.
Interests in the Leeward Islands, the Virgin Islands, Puerto Rico, and the Dominican Republic areencouraged to monitor the remnants of Beryl.
Tropical-storm-force winds extend outward up to 45 miles from the center.
High surf and risky rip currents are expected along parts of the Carolina and mid-Atlantic coasts through early week.
Tuesday a weak area of high pressure could move over Acadiana dropping rain chances down to about 20-30% but every other day this week rain chances will be up around 40-60% during the afternoon hours.
The same amount, two to three inches, was also expected to fall on the U.S. Virgin Islands and Puerto Rico, with up to five inches possible in some areas, through Tuesday.
The storm was forecast to weaken into a low-pressure system Monday by the time it reaches seas just south of Puerto Rico, which was devastated by Hurricane Maria in September. On average, the third storm forms August 13, said Phil Klotzbach, a tropical weather researcher at Colorado State University and Capital Weather Gang contributor.