Figure 1: Vertical slice of radar reflectivity (top) and differential reflectivity (bottom) showing deep convection initiated from an elevated layer of warmer, wetter air. This layer is indicated by an abundance of insects in differential reflectivity (ratio of horizontal to vertical reflectivity), shown as dark red. The storms produced on this day reached heights of over 12 km and resulted in the flooding at Glastonbury (Dr John Nicol, The University of Reading).