92nd American Meteorological Society Annual Meeting (January 22-26, 2012)

Tuesday, 24 January 2012: 2:15 PM
Classification of Precipitation Types in Lake-Effect Snow Events Using Dual-Polarimetric Doppler Radar Observations
Room 239 (New Orleans Convention Center )
Eric T. Ahasic, Univ. of Illinois, Urbana, IL; and J. Frame and T. R. Cermak
Manuscript (1.2 MB)

Dual-polarization observations of long-lake axis parallel lake-effect snow bands over Lake Ontario were obtained using a Doppler on Wheels (DOW) radar during the winter of 2010-2011. Radar volume scans were taken during multiple lake-effect events at locations on the southern and eastern shores of the lake. These radar observations were supplemented by surface observations of temperature, dewpoint, pressure, wind speed and direction, as well as rawinsonde observations. Also observed was the hydrometeor type occurring at the radar and at the rawinsonde launch site. Objective analysis of the radar data was performed at the specified times to match those of the surface observations. By comparing dual-polarization parameters such as differential reflectivity (Zdr), correlation coefficient (ρhv) and specific differential phase (KDP) with the observations of the hydrometeor type, it can be determined if a relationship exists between hydrometeor type and dual-polarization fields for lake-effect snow events. These relations may be of use in forecasting precipitation types and amounts.

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