![]() ![]() Truman Tornado in Poinsett County, Arkansas Tornadoes in Madison, Henderson, and Decatur Counties in Tennessee Newbern to Paris Landing, Tennessee tornado KNQA WSR-88D Storm Relative Velocity LoopĬraighead County, Arkansas to Obion County, Tennessee tornado This threat would be particularly enhanced if any supercells developed in the open warm sector ahead of the overnight complex with the cold front. The combination of these key ingredients suggested the likelihood of severe weather during the evening and overnight period. ![]() Effective layer bulk shear was around 70 kts across most of the Mid-South while the effective storm-relative helicity was in the range of 300-400 m2s-2. Meanwhile, strong winds at the surface and aloft provided the wind shear necessary for organized severe weather. Mean-layer CAPE (MLCAPE) was maximized at 1500-2000 J/kg (Figure 1) at 6 PM, which was around the time that the initial supercell began to affect the Mid-South.įigure 1. The instability wasn’t extreme, but it was more than adequate to sustain strong updrafts. Temperatures warming to near 80 degrees during the afternoon hours aided instability with a strong wind field providing the vertical wind shear needed for organized thunderstorms. A strong upper-level trough was approaching from the west, providing strong lift within an unseasonably warm and unstable air mass. ![]() An ominous signal for severe weather was apparent across the Mid-South leading up to the tornadoes of December 10-11, 2021. ![]()
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