Major Incidents | Slideshow

Midwest Severe Weather

01 / 15

APTOPIX Severe Weather

Lightning illuminates a house after a tornado touched down in Jefferson County, Ala., damaging several houses, Friday, Dec. 25, 2015, in Birmingham, Ala. A Christmastime wave of severe weather continued Friday. (AP Photo/Butch Dill)

02 / 15

Severe Weather

A postal worker walks through the rubble of what is left of the Lutts post office after Wednesday's tornado in Lutts, Tenn., Thursday, Dec. 24, 2015. At least 10 people were killed in as spring-like storms mixed with unseasonably warm weather and spawned rare Christmastime tornadoes in the U.S. South, officials said Thursday. (Larry McCormack/The Tennessean via AP) MANDATORY CREDIT

03 / 15

Severe Weather

Postal workers and inspectors sift through what is left of the post office after Wednesday's tornado in Lutts, Tenn., Thursday, Dec. 24, 2015. At least 10 people were killed in as spring-like storms mixed with unseasonably warm weather and spawned rare Christmastime tornadoes in the U.S. South, officials said Thursday. (Larry McCormack/The Tennessean via AP) MANDATORY CREDIT

04 / 15

Severe Weather

A vehicle sits among debris in an area near Linden, Tenn., Thursday, Dec. 24, 2015. Several people were killed in Mississippi, Tennessee and Arkansas as spring-like storms mixed with unseasonably warm weather spawned rare Christmastime tornadoes in the South. (AP Photo/Mark Humphrey)

05 / 15

Severe Weather

Vehicles and debris are scattered in an area near Linden, Tenn., Thursday, Dec. 24, 2015. Several people were killed in Mississippi, Tennessee and Arkansas as spring-like storms mixed with unseasonably warm weather spawned rare Christmastime tornadoes in the South. (AP Photo/Mark Humphrey)

06 / 15

Severe Weather

An emergency vehicle drives through a neighborhood in Rowlett, Texas, Sunday, Dec. 27, 2015, the morning after it was struck by a tornado. At least 11 people died and dozens were injured in apparently strong tornadoes that swept through the Dallas area and caused substantial damage this weekend. (AP Photo/Rex C. Curry)

07 / 15

Severe Weather

Damage of a house is seen after Saturday's tornado spread out in Rowlett, Texas, Sunday, Dec. 27, 2015. At least 11 people died and dozens were injured in apparently strong tornadoes that swept through the Dallas area and caused substantial damage this weekend. (AP Photo/David Warren)

08 / 15

APTOPIX Alabama Christmas Tornado

Birmingham firefighters work a scene after a tornado touched down in Jefferson County, Ala., damaging several houses, Friday, Dec. 25, 2015, in Birmingham, Ala. A Christmastime wave of severe weather continued Friday. (AP Photo/Butch Dill)

09 / 15

Severe Weather

Cars sit submerged in flood waters on Tallapoosa Street, Friday, Dec. 25, 2015, in Birmingham, Ala. A Christmastime wave of severe weather continued Friday as a tornado touched down in north-central Alabama, including part of Birmingham, the state's largest city. (AP Photo/Butch Dill)

10 / 15

Severe Weather

Birmingham firefighters work a scene after a tornado touched down in Jefferson County, Ala., damaging several houses, Friday, Dec. 25, 2015, in Birmingham, Ala. A Christmastime wave of severe weather continued Friday. (AP Photo/Butch Dill)

11 / 15

Severe Weather

Ladarren Phillips surveys tornado damage to a house on Rising Star Road in Holly Springs, Miss., Thursday, Dec. 24, 2015. At least 11 people were killed in as spring-like storms mixed with unseasonably warm weather and spawned rare Christmastime tornadoes in the U.S. South, officials said Thursday. Emergency officials blamed the severe weather for injuring scores of others and destroying dozens of cars, homes and businesses. (Stan Carroll/The Commercial Appeal via AP)

12 / 15

Severe Weather

Uprooted trees lay across yards as family and friends gather early Friday morning to offer assistance and support to victims of a tornado that hit Holly Springs, Miss., Thursday, Dec. 24, 2015. At least 11 people were killed in as spring-like storms mixed with unseasonably warm weather and spawned rare Christmastime tornadoes in the U.S. South, officials said Thursday. Emergency officials blamed the severe weather for injuring scores of others and destroying dozens of cars, homes and businesses. (Stan Carroll/The Commercial Appeal via AP)

13 / 15

Severe Weather

J.W. Skelton sits on what was a wall to Calvary Baptist Church in Ashland, Miss., Thursday, Dec. 24, 2015. At least 11 people were killed in as spring-like storms mixed with unseasonably warm weather and spawned rare Christmastime tornadoes in the U.S. South, officials said Thursday. Emergency officials blamed the severe weather for injuring scores of others and destroying dozens of cars, homes and businesses. (Stan Carroll/The Commercial Appeal via AP)

14 / 15

Severe Weather

Mississippi Governor Phil Bryant inspects tornado storm damage to a MDOT facility in Ashland, Miss., Thursday, Dec. 24, 2015. At least 11 people were killed in as spring-like storms mixed with unseasonably warm weather and spawned rare Christmastime tornadoes in the U.S. South, officials said Thursday. Emergency officials blamed the severe weather for injuring scores of others and destroying dozens of cars, homes and businesses. (Stan Carroll/The Commercial Appeal via AP)

15 / 15

Severe Weather

Volunteers help with clean up at Calvary Baptist Church following a tornado Thursday, Dec. 24, 2015, in Ashland, Miss. At least 11 people were killed in as spring-like storms mixed with unseasonably warm weather and spawned rare Christmastime tornadoes in the U.S. South, officials said Thursday. Emergency officials blamed the severe weather for injuring scores of others and destroying dozens of cars, homes and businesses. (Stan Carroll/The Commercial Appeal via AP)