MIAMI — Tropical Storm Dolly began moving away from warm Gulf Stream waters over the northern Atlantic on Tuesday and is expected to dissipate at midweek.

The U.S. National Hurricane Center said Dolly has maximum sustained winds of 45 mph (75 kph) but was expected to weaken during the coming day as it moves over colder waters.

The storm, which formed earlier Tuesday, is expected to become a post-tropical storm on Wednesday and then become a remnant low, forecasters said.

As of Tuesday afternoon, Dolly was centered about 605 miles (975 kilometers) southwest of Cape Race, Newfoundland, and it was moving east-northeast at 12 mph (19 kph). It did not pose a threat to any land.