This is the third time in this decade that a storm called “D” has formed so early in the Atlantic, says CNN meteorologist Taylor Ward.
The storm is 370 miles south of Halifax, Nova Scotia.
“The good news is that the storm is expected to last only a short time and drift away from the United States into the open waters of the North Atlantic,” Ward said.
All models agree that if Dolly continues to move east-northeast and will turn more northeast on Tuesday.
Later on a Tuesday afternoon or evening, the storm should begin to weaken.
The minimum should dissipate before early Thursday, the National Hurricane Center said.