Subtropical Storm Jerry formed Sunday in the Atlantic Ocean but posed no immediate threat to land, the National Hurricane Center said.
As of 11 a.m. EDT (1500 GMT), Jerry was located about 1,070 miles west of the Azores, with maximum sustained winds near 40 mph.
Forecasters said the storm was nearly stationary but was expected to begin moving slowly north-northeast later Sunday.
Subtropical storms are hybrid systems that get energy from warm waters like tropical ones, but also from colliding warm and cold air masses like more common storms over land.
Jerry is the 10th named storm of the Atlantic hurricane season. Its winds extended outward about 105 miles.
In the Pacific, Ivo was downgraded from a tropical storm to a depression early Sunday, the Hurricane Center said.
At 11 a.m. EDT (1500 GMT), the center of Ivo was about 110 miles west-southwest of the southern tip of Mexico's Baja California peninsula and moving to the northeast at 5 mph.
The depression - which had maximum sustained winds of 30 mph - is expected to pass over or near the southern tip of Baja later Sunday, the hurricane center said. Rainfall of 1 to 2 inches is forecast for the area.