Mesocyclone or Mothership?

National Geographic Traveler just announced its winners for its 2014 photo contest. The shots are all very cool, but I can't argue with the No. 1 pick: a mesocyclone over Colorado, taken by photographer Marko Korosec: Holy wow! I love this shot. Korosec was storm-chasing on May 28, 2013, when this vortex appeared near Julesburg, Colorado, in the extreme northeastern corner of the state, near Nebraska. Despite what you might think, eastern Colorado is extremely flat, and prone to, um, interesting...