CHARLESTON — Attention Lowcountry residents: Keep the rain boots and umbrellas handy.

A nor’easter forming off the East Coast promises to deliver more rain, high winds and surging tides to coastal South Carolina and most of the Eastern Seaboard, according to the National Weather Service.

“It’s gonna be a wet couple days,” said Blair Holloway, a meteorologist with the National Weather Service in Charleston .

Even before the arrival of the approaching nor’easter, parts of downtown Charleston were overwhelmed Oct. 10 by rainfall and a late-morning high tide that submerged roads and snarled traffic. Most of Lockwood Boulevard, which traces along the eastern edge of the peninsula, was fully underwater at midday.

Water flowed, too, down Wentworth and Market streets and many other places, f

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