Miami, Florida (CNN) -- Tropical Storm Danielle has formed in the Atlantic Ocean, about 725 miles (1,165 kilometers) west of the southernmost Cape Verde Islands, the National Hurricane Center said Sunday.
Danielle's maximum sustained winds were 40 mph (65 kph) with higher gusts as of 5 p.m. ET, the hurricane center said. The storm was moving northwest at near 12 mph (19 kph), the hurricane center said. It was expected to turn west-northwest and speed up later Sunday night.
"Additional strengthening is forecast during the next 48 hours, and Danielle could be near hurricane intensity by late Tuesday," forecasters said.
Tropical storm-force winds extended outward up to 50 miles (85 kilometers) from the center, the hurricane center said.
Tracking maps show the storm remaining out to sea and not nearing land through at least Friday. No coastal watches or warnings were in effect Sunday.
"If it were to approach the U.S. it would be a week away, but most models keep it at sea," CNN Meteorologist Jacqui Jeras said.
If Danielle develops into a hurricane, it would be the second of the season. Hurricane Alex sent thousands in northeastern Mexico to shelters in late June and early July.