updated 12/3/2009 10:20:31 AM ET 2009-12-03T15:20:31

Parts of North and South Carolina are under a tornado watch as heavy weather hits the Eastern Seaboard.

In North Carolina, the National Weather Service has issued the watch for the eastern third of the state until this morning. A flash flood watch has been posted for the Piedmont and southern mountains.

Meteorologists say nearly three inches of rain have fallen in areas of western North Carolina, and more could hit before the storm moves out.

In South Carolina, a tornado watch is up for the state's eight eastern counties. Rains swamped the coastline at high tide, snarling Charleston traffic and flooding intersections.

A high surf advisory is in effect on the south coast of South Carolina through this morning. Forecasters say waves as high has six feet could break on the beaches.

Authorities say one tornado has been spotted in South Carolina, but none in North Carolina.

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