Giant African land snails pose a big threat to Florida. CNN's John Zarrella explains why.

Tornadoes strike the Midwest, leaving devastation in their paths.

CNN's John Zarrella reports on where the winning powerball ticket was purchased in Florida.

A tornado west of Shawnee, Oklahoma crosses over a field lofting debris.

CNN's Carl Azuz details how good service landed a waitress an extraordinary tip.

A helicopter pilot for affiliate KFOR in Oklahoma recounts seeing the tornado damage on a trailer park.

CNN's Poppy Harlow has the latest on the Hofstra student that may have been mistakenly shot by police.

Investigators are focusing on a 'fractured rail' in Connecticut train collision. CNN's Susan Candiotti has more.