2010 New Year's Eve tornado outbreak
A destructive and deadly three-day-long tornado outbreak impacted the central and lower Mississippi Valley from December 30, 2010, to January 1, 2011. Associated with a low pressure system and a strong cold front, 37 tornadoes tracked across five states over the length of the severe event, killing nine and injuring several others.
Source: Wikipedia — 2010 New Year's Eve tornado outbreak (CC BY-SA 4.0)