The drop fall velocities and drop horizontal velocities in terms of magnitude and direction, all being derived from each drop image from two orthogonal cameras of the 2DVD, are also considered. These simulated values are compared with dual-polarized C-band radar data located at 15 km range from the 2DVD site to evaluate the contribution of the asymmetric drop shapes, specifically to differential reflectivity. Black line rain drop shape, Gray line perfect circle (equivalent spherical rain drop shape) Spherical Raindrop Radius (Req). From the scattering matrix elements, the polarimetric radar observables are simulated by integrating over 1 min consecutive segments of the event. Usually local air temperature will be close enough for sustained rain events. The 2DVD measurements are used for 3D reconstruction of drop shapes (including the rotationally asymmetric drops) and the drop-by-drop scattering matrix has been computed using Computer Simulation Technology integral equation solver for drop sizes >2.5 mm. initial differences in particle (condensation nuclei) size. Raindrops are different sizes for two primary reasons. The smaller drops are the ones that didn't run into as many droplets. The outer rain bands lasted 18 h (03:00 to 21:00 UTC on 08 October 2017) and a 2D-video disdrometer (2DVD) captured the event which was shallow at times and indicative of pure warm rain processes. When the drops finally reach the ground, the biggest drops will be the ones that bumped into and coalesced with the most droplets. Tropical storm Nate, which was a powerful hurricane prior to landfall along the US Gulf coast, traversed north and weakened considerably to a tropical depression as it moved near an instrumented site in Hunstville, AL.
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