David Drummond
Member
Supercell thunderstorm evolved behind an outflow boundary left by an overnight MCS, before a huge convective mess evolved. Storm went from blah to tornado in about 10 minutes. Depending on how you look at it, there were either two separate tornadoes, or one long one lasting over 10 minutes. I've posted an 11 minute video that shows the entire evolution, as it moved just south of FM1585, and then eventually made a north turn across the road in front of me. NWS called it one single tornado and rated EF2 due to it unroofing a building.
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Watch video >