MIAMI — Forecasters say Hurricane Adrian has been downgraded to a tropical storm off the Pacific coast of Mexico and it continues weakening rapidly.

Forecasters say maximum sustained winds for what had been the first hurricane of the 2011 season decreased this morning to about 70 mph. It is expected to weaken further over the next two days.

The U.S. National Hurricane Center in Miami predicts the storm’s center will stay well offshore but will generate large swells that could affect the southwestern coast of Mexico into the weekend.

The center of the storm was about 500 miles south-southwest of the southern tip of Baja, Calif. It is moving west-northwest at 12 mph.