Introduction
In the mid- to high-latitudes, the spatial structure and microphysics of precipitating clouds differ significantly from that of tropical and warm-cloud precipitation (1). The variety of precipitation particles, low precipitation rates, surface snow-cover, and low freezing level heights all contribute to additional uncertainties involving passive microwave (PMW) precipitation retrievals (2). To date, very few coincident aircraft and microwave observations have been made of mid-to-high latitude cold-cloud precipitation.