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nssl0208

Project Vortex-99. An occluded mesocyclone tornado rated an F3 by an NWS damage survey. Occluded means old circulation on a storm; this tornado was forming while the new circulation was beginning to form the tornadoes which preceeded the F5 Oklahoma City tornado. Photo #1 of sequence. Oklahoma 10 miles south of Anadarko. May 3, 1999.

 

Credit: OAR/ERL/National Severe Storms Laboratory (NSSL).

 

 

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Taken on October 5, 2010