Project Vortex-99. Occluded mesocyclone tornado. 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 #2 of sequence.

Image ID: nssl0209, NOAA's National Severe Storms Laboratory (NSSL) Collection
Location: 8 miles south of Anadarko, Oklahoma
Photo Date: May 3, 1999
Credit: OAR/ERL/National Severe Storms Laboratory (NSSL)

• High Resolution Photo Available