Patrick Semansky / AP
A worker uses a chainsaw to clear branches from a tree that fell onto the 14th fairway at Congressional Country Club in Bethesda, Md., Saturday, June 30, 2012, after a strong storm blew through overnight. The AT&T National golf tournament was postponed to allow workers to clear the course. More than two million people across the eastern U.S. lost power after violent storms and two people died, including a 90-year-old woman asleep in bed when a tree slammed into her home, a police spokeswoman said Saturday.
Jonathan Ernst / Reuters
Storm-damaged trees litter the east lawn of the U.S. Capitol.
"We have more than half our system down," said Myra Oppel, a spokeswoman for Pepco, a utility serving the D.C. area that had 400,000 customers without power after 80 mph gusts knocked down trees and power lines Friday night.
"This is definitely going to be a multi-day outage," Oppel added -- not good news for those relying on air-conditioning to deal with the muggy, triple-digit temperatures this weekend.
-- Reported by msnbc.com staff and news service reports
Mandel Ngan / AFP - Getty Images
An uprooted tree caused damage to electrical lines and a home in the American University neighborhood of Washington, DC, on June 30, 2012 the morning after a violent storm swept through the area.
The Weather Channel's Julie Martin reports from Atlanta on the heat wave expected to bring temperatures of 100 degrees to 24 of the 50 states this weekend.