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May 21, 2010 Torrington, WY

By Derek Deroche, May 21, 2010 10:36 pm

Chased with Scott Blair, initially targeting NE Colorado as rapid moisture was advecting into the high terrain. We were counting on either the Palmer Divide or the Cheyenne Ridge to initiate convection by the mid afternoon hours. Well, neither scenario occurred and the only storms that developed were off the mountains in eastern Wyoming. Out of the initially ragged convection, one storm finally developed into a supercell producing a brief tornado early in its life cycle. By mid afternoon, it became evident that storms were not going to develop in our area of interest. So in a last ditch effort to salvage the day, we headed north to intercept the eastern Wyoming cell. We arrived on the storm north of Torrington, WY where we observed a relatively tight area of rotation as the RFD wrapped around the low level circulation. This feature eventually occluded but failed to produce a tornado.  We headed north on Hwy 159, observing golf ball sized hail. We eventually called it a day due to poor road options.

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