Project Vortex-99. Occluded mesocyclone tornado.Occluded means old circulation on a storm; this tornado was formingwhile the new circulation was beginning to form the tornadoes which preceededthe F5 Oklahoma City tornado. Photo #3 of sequence.
10/22/2018 11:50:25 AM
Date: 3-May-99
Credit: OAR/ERL/National Severe Storms Laboratory (NSSL)
Location: Oklahoma 7 miles south of Anadarko
Subject: Tornadoes