BALTIMORE — Oceans Calling remains on for this weekend, but a nor’easter will leave Ocean City windy Friday and keep the more flood-prone communities watching for high-tide cycles.

Festival organizers delayed Friday’s opening to 1 p.m. and set a midnight curfew as crews address weather challenges. The box office will open at 11 a.m. Friday.

Excessive rain is not expected, and the risk of flash flooding remains low, according to Worcester County’s Department of Emergency Services. Officials said coastal flooding, powerful surf, rip currents and beach erosion are the primary concerns.

Opening day brings a 30% chance of showers, a high near 68 and north winds of 25 to 28 mph, gusting to 38 mph, according to the National Weather Service. Saturday should improve to mostly sunny, near 71, although gusts could reach 33 mph. Sunday is forecast to be partly sunny and near 69. A high-surf advisory remains through 7 a.m. Friday.

According to the National Weather Service’s Wakefield office, a coastal flood warning runs through 4 p.m. Friday in Worcester County and 4 a.m. Friday in Dorchester, Wicomico and Somerset counties. One to two feet of water above ground level is possible in low-lying areas near shorelines and tidal waterways, enough to close roads and threaten homes, businesses and vehicles.

The flooding may outlast the bad weather warnings. Weather Service tide tables project moderate flooding in Crisfield into early Sunday and at Bishops Head throughout the weekend, including possible major flooding Saturday afternoon. Cambridge could see minor to moderate flooding through Sunday.

South Dorchester School was closed Thursday. Students at Cambridge-South Dorchester High School and Dorchester Career and Technology Center who live below Church Creek also were told not to report. Other Dorchester students already had a half-day for conferences.

No other weather-related school closures or delays had been publicly announced by 8:45 a.m. Thursday.

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