Juston Drake and Simon Brewer
documented two tornadoes, one tornado was violent, near Alpena, SD on 18
June 2014. We waited most of the afternoon in southeastern South Dakota.
Remnants of a low-level boundary near Sioux Falls, SD enhanced by outflow
from the previous day had our attention. It didn't appear troughing aloft
would move over this location, so it became more apparent storms might not
develop off this boundary. Meanwhile, tornadoes were being reported to our
northwest on a "tail-end Charley" supercell on the southern flank
of a broken squall line. The CAP was strong again this day and we finally
decided it probably wasn't going to break over Sioux Falls, so we jumped
on the tornadic supercell approaching Woonsocket, SD.
We saw a developing wall
cloud west of Woonsocket upon arrival. Within a few minutes a tornado developed.
This tornado rapidly intensified into a violent stovepipe, which moved nearly
due north. A short-lived rope tornado formed along the RFD gust front between
our location and the intensifying tornado to our West. The primary tornado
caused EF4 damage to a residence in its path. It also had probably the most
visually spectacular rope-out stage of any tornado we've witnessed. Below
are several images from the tornadoes we documented this day:
June 2014 looking west at intesifying mesocyclone tornado in background
with RFD gustfront rope tornado in foreground
June 2014 looking NNW at violent stovepipe tornado near Alpena, SD
(tornado showed violent motions appearing to be a max intensity ATTM)
June 2014 looking west at stovepipe tornado south of Alpena, SD
June 2014 looking west at "Wizard of OZ" like tornado southwest
of Alpena, SD
June 2014 pushed in look at rope tornado southwest of Alpena, SD
June 2014 looing WNW at strong rope tornado west of Alpena, SD
spectacular rope-out stage from this tornado)
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