A multi-day severe weather event continued on Tuesday as tornado warnings were issued in at least five states.

St. Louis' emergency management commissioner has been placed on administrative leave, the mayor said, after tornado sirens failed to be activated ahead of Friday's storm.

On Wednesday at 5 p.m. the National Weather Service issued a tornado warning in effect until 5:30 p.m. for Allegheny, Washington and Westmoreland counties.

On Wednesday at 3:57 a.m. the National Weather Service issued a tornado warning in effect until 4:30 a.m. for Bullock and Macon counties.

The National Lightning Detection Network counted all of the lightning flashes and strikes across our Michigan sky last Thursday and Friday. You won't believe how many lightning events we had in just that one storm system.

At 5:50 p.m. on Wednesday, the National Weather Service released an updated tornado watch in effect until 8 p.m. for Westmoreland County.

Experts say planning before a tornado threatens is key for staying safe. Weather radios, basements and bicycle helmets can all help save lives.

WICHITA — On May 4, 2007, Greensburg, Kansas, was slammed by a 205 mph EF5 tornado that killed 12 and damaged or destroyed much of the town. On Sunday night, it almost happened again as a family of massive, violent tornadoes tore through south-central Kansas.

Justin McIntyre, 18-year-old resident of London, Kentucky, joins 'America's Newsroom' after surviving an EF-4 tornado that destroyed his family home while he took shelter in a bathtub with his mother.