2010 New Year's Eve tornado outbreak  The 2010 New Year's Eve tornado outbreak was a three-day-long tornado outbreak that 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. Activity was centered in the states of Missouri and later Mississippi on December 31. Seven tornadoes were rated EF3 on the Enhanced Fujita Scale; these were the strongest during the outbreak. Non-tornadic winds were recorded to have reached as high as 80 mph (130 km/h) at eight locations on December 31, while hail as large as 2.75 in (7.0 cm) was documented north-northeast of Mansfield, Missouri. Overall, damage from the outbreak totaled US$123.3 million, most of which was related to tornadoes. The United States Storm Prediction Center first noted a possible New Year's Eve severe weather event as early as December 25, 2010. These forecasts gained confidence as the event approached, with a focus on the Ozarks and adjacent areas. Supercells developed in this area during the night of December 30 and tracked across central Missouri, producing several tornadoes and large hail. However, the bulk of activity during the outbreak was a result of a long line of supercells that tracked from Oklahoma to Illinois, producing five EF3 tornadoes. One of these tracked through northwestern Arkansas, killing four. Another tore through eastern sections of Fort Leonard Wood in Missouri, destroying 159 homes and causing US$90 million in damage, making it the costliest tornado of the outbreak. A separate cluster of storms later developed in Louisiana before tracking into Mississippi, producing several tornadoes across southern and central regions of the state on January 1. The Storm Prediction Center (SPC) began to note the possibility that a severe weather event could develop on December 30 as early as December 25, 2010. Nonetheless, the predictability of the event was too low as the event was several days out. As the anticipated event grew closer, confidence in the forecast slowly increased, though uncertainties in the timing and extent of the tornado outbreak still existed. These uncertainties remained through December 29 with forecasts calling for only marginal hail and possibly damaging gusts. However, the SPC indicated that discrete tornadic supercells and more severe thunderstorms could result from atmospheric conditions deviating slightly from the forecast.