Across the city, power lines and trees are downed, traffic lights are out and glass is scattered across downtown. About 900,000 customers were left without power early Friday.

A severe summer storm system swept from Alabama to New York on Monday, leaving a trail of toppled trees, damaged buildings and transportation headaches in its wake.

The derecho, which raced through the Midwest and focused its attention on Iowa, led to $7.5 billion in damage. That's more expensive than some hurricanes.