Dan Robinson
EF5
A mostly-marginal setup today across the Midwest offered a few areas of transient supercell potential. Down in the St. Louis area, an old outflow south of the metro was my initial target, but the storm in that vicinity could not get going. I ended up north of the city at Alton as a storm briefly went supercellular, albeit above its own outflow at the surface. The storm had some nice midlevel inflow banding curving into the updraft. The show was the lightning. Strong MLCape (3,000) and a puff of barely-20kt midlevel flow during the late afternoon turned this storm into a crazy CG lightning producer over Alton. Bolts struck both the Clark Bridge and the locks and dam, the latter with upward leaders coming up off of the light poles.
Blog post with video frames:
http://stormhighway.com/blog2018/aug718a.php
Video of this is here:
Blog post with video frames:
http://stormhighway.com/blog2018/aug718a.php
Video of this is here:
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