Mobile radar observations and damage assessment of the 24 May 2011, Canton Lake, OK tornado
The reflectivity presentation of the knob of the hook significantly evolves throughout the lifecycle of the tornado, most notably as a function of the type of debris present in the radar bins. In particular, while the tornado approached Canton Lake, a debris ball was detected. When the tornado moved over Canton Lake, the reflectivity structure of the knob exhibited a clear eye, but as the tornado moved northeast of the lake, over wooded land, a prominent debris ball replaced the clear eye. Dual-polarization signatures (Zdr and ρhv) also changed significantly as the tornado moved from land to lake surface and back to land.