On the left, a typical debris ball shown as an area of high reflectivity on the end of the hook echo of the parent supercell of the 2011 Joplin tornado co-located with a velocity couplet on the right
A tornadic debris signature (TDS), often colloquially referred to as a debris ball,[1] is an area of high reflectivity on weather radar caused by debris lofting into the air, usually associated with a tornado.[1][2] A TDS may also be indicated by dual-polarization radar products, designated as a polarimetric tornado debris signature (PTDS). Polarimetric radar can discern meteorological and nonmeteorological hydrometeors and the co-location of a PTDS with the enhanced reflectivity of a debris ball are used by meteorologists as confirmation that a tornado is occurring.[3]
^ abBunkers, Matthew J.; Baxter, Martin A. (August 23, 2011). "Radar Tornadic Debris Signatures on 27 April 2011" (PDF). National Weather Service. Retrieved 31 December 2012.
^"Severe Weather & Flooding Event of March 3, 2012; Lowndes-Lanier Co. EF3 Tornado". Tallahassee, Florida: National Weather Service. Retrieved 31 December 2012.
^"Tornadic Debris Signature from Dual Polarization Radar". NWS Birmingham, AL. October 3, 2012. Retrieved 2014-05-12.
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