The Orlando Sentinel has reported that a Comair flight (Delta Connection - OH) operating KLGA-KDAB that was landing at about the time of the tornado was not warned or made aware of the event in part because controllers were not aware of the tornado themselves.
Fair use excerpt from the article:
A Comair passenger jet about to land at Daytona Beach International Airport was on a collision course Monday with a tornado that air-traffic controllers knew nothing about.
Aviation officials failed to warn the controllers about the Christmas Day twister that could not be detected on the type of weather radar used at the airport, the Federal Aviation Administration acknowledged Thursday.
Making matters worse, the controllers' union says, a recent policy change banned radios from the tower that could have received an alert sent 20 minutes before the tornado touched down.
Link to the article:
http://www.orlandosentinel.com/news/...home-headlines