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.
Located around 200 miles south-southeast of Cape Hatteras in North Carolina, Storm Chris has sustained top winds of 60mph (95kph) according to the US National Hurricane Center (NHC).
There were no hurricane or storm watches or warnings posted Monday morning, but forecasters said Sunday that Chris will bring "life threatening" rough surf and risky rip currents along the East Coast.
Weather forecasters say Tropical Storm Chris is likely to strengthen to a hurricane by Monday but will remain well away from the US coast for the next two or three days.
Chris is relatively close to the North Carolina coast, but no watches or warnings are in effect there.
Officials in Puerto Rico say more than 20,000 customers have lost power due to the remnants of Hurricane Beryl, which is hitting the island with rains and gusty winds.
It said winds would fall below gale force during the night, but people on area islands should be alert for possible heavy rain that could cause flooding or mudslides.
Tropical Storm Chris continues to meander off the coast of North Carolina.
"Other than some impacts at the beaches, there are no direct impacts expected for the MYR and Grand Strand areas if Chris does become a hurricane", said Steve Pfaff with the Wilmington National Weather Service.
The US National Hurricane Centre said: Chris has been almost stationary the past several hours, and little motion is expected during the next day or so.
Chris has the potential to strengthen into a hurricane because of warm sea surface temperatures and favourable winds.
"Tropical storm conditions are expected in Dominica and Guadeloupe tonight".
Gov. Ricardo Rossello said the government has opened 42 shelters for citizens to obtain relief from Beryl at the demand of mayors across the island.
"The main hazards will be torrential rainfall and strong, gusty winds", which could reach 45 miles per hour, the National Weather Service in San Juan said. Chris is centered between two mid-level highs in a mid- to upper-level trough to its northeast.
Formation chance through 48 hours is low at near 0 percent.