Hardy Street in front of the University of Southern Mississippi campus is obstructed by debris blown by an apparent tornado in Hattiesburg, Miss., Sunday, Feb. 10, 2013. (AP Photo/The Student Printz, Jana Edwards)

This photo provided by Jordan Holliman shows a tornado moving through Hattiesburg, Miss., Sunday, Feb. 10, 2013. Emergency officials say an apparent tornado has caused significant damage in Hattiesburg, Miss., after passing along a main road. Major damage was reported in Hattiesburg and Petal, including on the campus of the University of Southern Mississippi. (AP Photo/Jordan Holliman)

Extensive damage at the University of Southern Mississippi on Hardy Street in Hattiesburg Miss., Feb 10, 2013 after a tornado passed through the city Sunday afternoon. (AP Photo/Hattiesburg American, Ryan Moore)

Emergency personnel stage near the University of Southern Mississippi along Hardy Street in Hattiesburg Miss., Sunday, Feb 10, 2013 after a tornado passed through the city. Major damage was reported in Hattiesburg and Petal, including on the campus of the University of Southern Mississippi. (AP Photo/The Hattiesburg American, Ryan Moore)

An overturned car lies in front of the University of Southern Mississippi campus in Hattiesburg, Miss., after a possible tornado Sunday, Feb. 10, 2013. (AP Photo/Chuck Cook)

Two people are seen consoling one another in a shattered door way along Hardy Street in Hattiesburg Miss., Feb 10, 2013 after a tornado passed through the city Sunday afternoon, Feb. 10, 2013. Major damage was reported in Hattiesburg and Petal, including on the campus of the University of Southern Mississippi. (AP Photo/The Hattiesburg American, Ryan Moore)

A heavily damaged vehicle sits near the front of the University of Southern Mississippi on Hardy Street in Hattiesburg Miss., Feb 10, 2013 after a tornado passed through the city Sunday afternoon. (AP Photo/Hattiesburg American, Ryan Moore)

A heavily damaged vehicle sits near the front of the University of Southern Mississippi on Hardy Street in Hattiesburg Miss., Feb 10, 2013 after a tornado passed through the city Sunday afternoon. (AP Photo/Hattiesburg American, Ryan Moore)

A house is damaged in Hattiesburg Miss. after a tornado passed through the city Sunday, Feb. 10, 2013. (AP Photo/Hattiesburg American, Ryan Moore)

A trampoline rests on top of a damaged American Red Cross disaster relief truck outside of the Hattiesburg American Red Cross center which was completely destroyed by an apparent tornado that moved through Hattiesburg, Miss., Sunday, Feb. 10, 2013. (AP Photo/The Hattiesburg American, Bryant Hawkins)

Hattiesburg Police officers talk to onlookers at a damaged gas station in Hattiesburg, Miss. after an apparent tornado that moved through area on Sunday, Feb. 10, 2013. (AP Photo/The Hattiesburg American, Bryant Hawkins)

A women observes the damage to a closed and unoccupied dormitory on the University of Southern Mississippi campus caused by an apparent tornado in Hattiesburg, Miss., Sunday, Feb. 10, 2013. (AP Photo/The Student Printz, Jana Edwards)

A business at 5133 Lincoln Road Extension in Hattiesburg, Miss., is damaged after an apparent tornado Sunday, Feb. 10, 2013. Major damage was reported in Hattiesburg and Petal, including on the campus of the University of Southern Mississippi. (AP Photo/Chuck Cook)

Ogletree House is severely damaged on the campus of the University of Southern Mississippi in Hattiesburg, Miss., Monday, February 11, 2013, after a tornado struck the area Sunday afternoon. The building, built in 1912, housed the university alumni association offices. (AP Photo/Chuck Cook)