Storms cut power to hundreds of thousands of customers around Dallas and could produce tornadoes in the Tennessee Valley with wind-whipped snow in Chicago.
On Friday, a level 3 out of 5 enhanced risk of severe weather has been drawn by the Storm Prediction Center for much of Kentucky, Middle Tennessee and northern parts of Alabama and Georgia. That includes Cincinnati, Louisville, Lexington and Bowling Green, Ky., and Nashville, Huntsville and the Interstate 75 corridor of extreme northwest Georgia.
A level 2 out of 5 risk surrounds the level 3 risk area clipping Charlotte on its eastern periphery and encompassing Atlanta, Birmingham, Tuscaloosa and Montgomery, Ala., to the south.Storms will be relatively low-topped , so the likelihood of large hail is low. Instead, the limited instability to fuel tall thunderstorms is offset by very high shear, or a change of wind speed and/or direction with height. That means any storm clouds that grow even to 20,000 feet will be subject to rotate.
Most thunderstorms will form an arcing line along the actual cold front itself. That broken line will feature embedded “kinks of rotation” that can generate quick-hitting tornadoes. Because the circulations are rather shallow, they are difficult to spot in advance on radar. That’s why today’s twisters may come with little notice and behave erratically.Thunderstorms will also efficiently mix jet stream momentum to the surface in the form of strong to damaging straight-line winds.
By sunset, storms will be moving through Columbus as the overall line slides into West Virginia. the western Carolinas and northern Georgia.
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