During June 2000 and late May through June 2001 field campaigns were conducted to obtain simultaneous in-situ airborne measurements of electric fields and microphysical content in anvils and anvil debris clouds near Kennedy Space Center using the University of North Dakota Citation jet aircraft. The microphysical measurements provide a comprehensive look at the entire particle spectrum from a few microns to more than a centimeter. The probes include the PMS-FSSP (~3 to 55 microns), the PMS-1D-C (~20 to 600 microns), the PMS-2DC (~33 to 1000 microns), the SPEC Cloud Particle Imager (~10 to 1000 microns), and the SPEC-HVPS (~0.2 to 45 mm). This paper will present microphysical summaries at different distances downwind of the storm cores for some of the cases. Preliminary findings indicate that the aggregation process is an active process at cold temperatures and in most regions of these anvils even far from the core. The study will focus on the aggregation process and how it effects the temporal and spatial evolution of the hydrometer spectrum.