SAVANNAH, Ga. (AP) — Savannah's weekend St. Patrick's Day celebration turned from emerald green to pitch black as the city lost power, plunging the downtown party into darkness as thousands roamed the streets.

The only lights late Saturday in the city's historic district were flashing atop police cars as officers directed traffic amid throngs of revelers ambling through streets littered with plastic cups and party debris.

"It's just people wandering around in the dark, man," said 23-year-old Danielle Smith, looking for friends amid the confusion near the city's riverfront. "This is crazy!"

The blackout hit at about 10 p.m. as powerful thunderstorms tore through southern Georgia and South Carolina just north of Savannah. Georgia Power said about 150,000 customers in the region were without electricity after transmission lines were knocked out by the storms.