PHOTO; Super Cell Storm produces 2 rare tornadoes rotating anticyclonically

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On June 4, a lone supercell thunderstorm developed southeast of Denver and moved south near the city of Simla, Colo. Chasers say the storm produced as many as four tornadoes, and although the National Weather Service in Boulder surveyed tornado damage up to EF-1, they have not been able to confirm exactly how many tornadoes the monster supercell produced.

But this amazing shot from storm chaser and photographer Kelly DeLay explains a little bit about the storm that had weather geeks in awe last week: at one point, the supercell had two tornadoes under it, simultaneously.

[Stunning stovepipe tornado grinds across Colorado landscape]

Many different photos and videos of this storm have been shared, and it does seem that one of the tornadoes was rotating anticyclonically — or clockwise — which is a pretty rare occurrence. Just like mid-latitude cyclones and hurricanes, tornadoes in the Northern Hemisphere tend to rotate counter-clockwise, along with their parent thunderstorms, because of the rotation of the Earth and the Coriolis effect.

http://www.washingtonpost.com/blogs/capital-weather-gang/wp/2015/06/08/photo-one-amazing-supercell-two-incredible-tornadoes/