More than 3 million people in the eastern U.S. faced a second day of 100-degree temperatures without electricity Sunday after storms ripped through the region, and the storms' death toll was raised to 17.

It could be several days before all power outages in Washington, D.C., and elsewhere are restored, officials said, and The National Weather Service said another round of thunderstorms was possible late Sunday and early Monday.

"Unlike a polite hurricane that gives you three days of warning, this storm gave us all the impact of a hurricane without any of the warning of a hurricane," Maryland Gov. Martin O'Malley said, after the storms late Friday toppled massive trees onto cars and blocked roads in the nation's capital.

The severe weather that began Friday was blamed for 17 deaths, most from trees falling on homes and cars. Three people were killed Sunday in eastern North Carolina when sudden storms hit there. Meanwhile, Coast Guard officials say they have suspended the search for a man who went missing early Saturday while boating during the storm off Maryland.