Officials are assessing the damage after a strong storm system moved across the southern U.S. over the weekend. The storms spawned tornadoes across the region and killed at least four people. National Weather Service meteorologist Frank Pereira says the line of severe weather led to about 40 tornado reports from southeastern Texas to Alabama. Those reports remain unconfirmed until damage surveys are completed. Pereira says such weather isn't unheard of this time of year, but it is unusual. A few of the busiest U.S. airports were directly in the path of the severe weather. Over 200 flight delays to or from the Hartsfield-Jackson Atlanta International Airport were reported Sunday morning.