"Swells generated by Chris are expected to increase and affect portions of the coasts of North Carolina and the mid-Atlantic states into early next week", the advisory said, adding that some of the resulting conditions could be life-threatening.
Tropical Storm Chris was about 160 miles (257 km) south of Cape Hatteras in North Carolina with top sustained winds of 45 miles per hour (72 kph), the NHC said in an advisory. A man died in the rough surf in Kill Devil Hills, North Carolina, on Saturday, when Chris was still a tropical depression. Barbados' government removed at tropical storm watch. It was centered 210 miles (335 kilometers) east of Martinique and was moving west-northwestward at 23 mph (37 kph).
Tropical storm watches are in effect for Martinique, St. Martin, St. Barthelemy, Saba, St. Eustatius and St. Maarten. They expect Chris to become a hurricane by mid-week with additional strengthening forecast afterward.
Elsewhere in the tropical Atlantic, Beryl - once a hurricane - has weakened substantially on approach to the Lesser Antilles.
Varner, Kraft lead at Greenbrier
Kraft fired a 6-under-par 64 on Thursday and wasn't done as he rolled up eight birdies against the bogey on No. 12 on Friday. Kim had back-to-back bogeys on the front nine on the Old White TPC, and then ran off five birdies over a seven-hole stretch.
Beryl is expected to produce total rain of 2 to 3 inches through Tuesday across the Leeward and the Virgin Islands, as well as Puerto Rico. Some pockets of moderate to heavy showers and occasional gusty winds are still possible however, with rainfall accumulations of 25 - 50mm (1 to 2inches) with isolated higher amounts.
It is said Beryl will "degenerate into a trough of low pressure" as it moves into the eastern caribbean sea by Monday.
The tropical storm, now building near the Carolinas, is expected to strengthen into a hurricane Monday and will most likely remain offshore for two to three days, forecasters said.
Puerto Rico, which was devastated by Hurricane Maria in September, remains under a state of emergency.