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Story highlights

NEW: Ana is downgraded to a tropical depression

It made landfall at 6:00 a.m. just north of Myrtle Beach, South Carolina

Ana is the first named storm of the 2015 Atlantic tropical storm season

(CNN) —  

The first Atlantic tropical storm of the year appears poised to hit the shores of North Carolina or South Carolina by early Sunday.

Ana is now a tropical depression, the National Hurricane Center said in its 2 p.m. ET update. Warnings and watches were lifted.

As a tropical storm, Ana had sustained winds at 50 mph. When it came ashore just north of Myrtle Beach at 6 a.m. Sunday, winds were at 45 mph, the hurricane center said.

“On the forecast track, the center of Ana will move over eastern North Carolina later today and tonight,” the center said. The storm is expected to continue northward.

Along its path, Ana is bringing heavy rain and storm surges.

Ana generally could drop 1 to 3 inches of rain, with isolated amounts of up to 5 inches, over the eastern Carolinas through Monday, according to the weather service.

During high tide, storm surges were forecast to send 1 to 2 feet of water onto coastal land. Combined with rain, that could cause flooding in low-lying spots, the weather service said.

Beachgoers should take Ana seriously – high rip currents could sweep swimmers out to sea, and waves are expected to be rough.

The winds could break tree limbs, cause scattered power outages and cause minor damages to porches, awnings, carports and sheds, said the National Weather Service’s office in Wilmington, North Carolina.

“Interests elsewhere in eastern North Carolina and Virginia should monitor the progress of Ana,” the National Weather Service said.

CNN’s Jason Hanna contributed to this report.