The Atlantic hurricane season for 2017 got off to an early start on Wednesday with the formation of a subtropical depression in the central Atlantic.

The National Hurricane Center had been tracking a non-tropical low over the past few days and upgraded the system to a subtropical depression at its 10 a.m. advisory.

A subtropical cyclone has some features of a purely tropical weather system, but in other ways resembles a non-tropical low.

Winds in the depression were 30 knots. The system was moving north-northeast at 10 mph.

Forecasters did not expect the system to strengthen.

No watches or warnings were in place, and the Hurricane Center expected the depression to be absorbed by another weather system within 36 hours.