Violent evening storms following a day of triple-digit temperatures wiped out power to millions of people across the eastern United States, causing at least 13 fatalities. At least six of them were in Virginia -- including a 90-year-old woman asleep in bed when a tree slammed into her home, a police spokeswoman said Saturday.

Widespread power outages were reported from Indiana to New Jersey, with the bulk of the service interruptions concentrated on Washington, D.C. and surrounding areas. Earlier Friday, the nation's capital reached 104 degrees -- breaking its June monthly record of 102 set just last year.

On Saturday, President Obama spoke to governors of four states hit hard by the bad weather

Maryland Gov. Martin O'Malley declared an emergency as it cleans up for storms that killed at least two people 

West Virginia Gov. Tomblin declared a state of emergency after

Ohio Gov. Kasich followed suit later Saturday morning, declaring a state of emergency for his state, 

 Virginia, Gov. McDonnell declared a state of emergency in a press conference midday Saturday

The Department of Homeland Security and the Federal Emergency Management Agency (FEMA) will coordinate disaster relief efforts.