We tread untested waters. The tornado ongoing in Hale County, AL is likely violent, based on a TDS height above 23,000 feet and a rotational velocity of at *least* 107 kt. We haven't really seen tornadoes with this type of Vrot/TDS combo, as there are no analogs in my database! pic.twitter.com/hxU65XtDC1

— Sam Emmerson (@ou_sams) March 25, 2021