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Know It All: Wednesday's top stories from NBC News

AP Photo/John Wark

An abandoned car lies off a road devastated by flood waters along the South Platte River east of Greeley, Colo, on Tuesday. Northern Colorado's broad agricultural expanses are especially affected, with more than 400 lane-miles of state highway and more than 30 bridges destroyed or impassable.

Here are some of the stories we're following Wednesday at NBC News:

Woman shot in head, hand during Navy Yard rampage returns home
A survivor of the massacre at the Washington Navy Yard has been released from the hospital after being shot in her head and hand by Aaron Alexis. Officials say a police officer who was shot in his legs and a woman with gunshot wounds to her shoulder should remain hospitalized. Read more at NBC News.

White House demands across-the-board security review after DC shooting
President Barack Obama has ordered a comprehensive inspection of government contractor and employee security standards across federal agencies, the White House says. The Navy Yard shooting has raised concerns about protections at U.S. military installations. Read more at NBC News.

The missing: Hundreds of people still unaccounted for after Colorado floods
As waters recede and move east onto the Colorado plains, crews on Wednesday are conducting fewer emergency airlifts and redoubling their efforts to find hundreds of people still missing after last week's destructive flooding. Meanwhile, experts say climate change may have contributed to the floods, which killed at least eight people. Read more at NBC News.

Authorities searching for Georgia girl, 14, abducted by armed robbers
A nationwide Amber Alert remains in effect for a 14-year-old Georgia girl kidnapped by two gunmen who shot the family dog during a robbery. Ayvani Hope Perez is believed to be "in harm's way," police say. Read more at NBC News.

Ohio man who made YouTube DUI confession expected to plead guilty
Matthew Cordle, the Ohio man who confessed in a much-watched video to causing a deadly wrong-way crash after a night of heavy drinking, is set to plead guilty Wednesday to aggravated vehicular homicide. The version on the video uploaded to YouTube has been viewed more than 1.9 million times. Read more at NBC News.

The reviews are in: New iPhones receive early praise from testers
Testers who got their hands on the iPhone 5S and the iPhone 5C last week are singing the praises of the new hardware — especially the premium 5S, which boasts a fingerprint scanner and an improved chip and camera. Read more at NBC News.

The Associated Press contributed to this report.

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