Abstract
The transition region of a winter storm affected northern Alabama on 1 February 2007, and was observed by the University of Alabama in Huntsville (UAH)/WHNT-TV Advanced Radar for Meteorological and Operational Research (ARMOR) dual-polarization C-band radar and the UAH Mobile Integrated Profiling System. This allowed for observations of the changing temperature and humidity profiles with time as precipitation transitioned from snow, to sleet, to freezing rain, and eventually to rain—as the atmosphere warmed with time. During the period of freezing rain and rain, pockets of mixed-phase precipitation continued to be observed via ARMOR, indicating the height and/or depth of the melting level varied across the area. Vertical velocity and signal-to-noise ratio data from the wind profiler also are examined as precipitation type changed. The observations allow for explanation of the large-scale and microphysical processes occurring in this transition region.
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