National Severe Storms Laboratory has released an image documenting the rotation tracks of the devastating tornadoes on April 27.
The image of the rotation tracks was produced by the On Demand Severe Weather Verification System, part of NSSL’s Warning Decision Support System – Integrated Information (WDSS-II) Multi-Radar/Multi Sensor platform.
Bright reds, oranges and yellows show tracks of where rotation was strongest as detected by NWS Doppler radars during the April 27, 2011 tornado outbreak.
More information here, with a link to create your own maps.
Thanks to Meteorologist Derek Kinkade of WTVM for sharing this information.