The eastern Great Lakes (Erie and Ontario) are often affected by intense lake-effect snowfalls. Lake-effect storms that form parallel to the major axes of these lakes can strongly impact communities by depositing more than 100 cm of snowfall in less than 24 h. Long-lake-axis-parallel (LLAP) storms are significantly different in structure and dynamics compared to the much more studied wind-parallel roll storms that typically form over the western Great Lakes. A Doppler on Wheels (DOW) mobile radar sampled several of these storms at fine spatial and temporal resolutions (and close to the surface) during the winter of 2010-11 over and downwind of Lake Ontario to document and improve understanding of how these storms develop. Over 1100 observations of vortices were catalogued within the 16 December 2010 and 4-5 January 2011 events. The majority of these vortices were less than 1 km in diameter with a statistical modal difference in Doppler velocity (delta-V) value across the vortex of 11 m s 21 . Vortices developed along boundaries, which formed within the bands, suggesting horizontal shear instability was the main cause. Other features noted in the DOW observations included bounded weak echo regions, anvils, and horizontal vortices, typically on the south side of west-eastoriented LLAP bands. The reflectivity and velocity structure of LLAP bands were found to be much more complex than previously thought, which may impact localized precipitation amounts and errors in forecast location/intensity.

A GIS-based assessment of lake-effect snow warnings in Upstate New York. J. Operational Meteor., 2 (6), 5970, doi: http://dx.doi.org/10.15191/nwajom.2014.0206. ) also have been documented. Twenty-four-hour snowfall measurements taken by National Weather Service (NWS) observers during Lake Ontario LES events were collected. Utilizing a geographic information system, snowfall was interpolated from spotter reports with the kriging method. Then, the area of warning-criteria snowfall was compared to the area of the corresponding county-based LES warning for calculation of false alarm percentage. This warning performance evaluator identified the proportion of a county-based LES warning that received sub-warning-criteria snowfall. Percent of false alarm was calculated using temporally comparable snowfall reports and all available reports from each event. Corresponding author address:A total of 13 events from the 2009-2010 through 2011-2012 LES seasons were analyzed. The average percent of false alarm was approximately 90%. This suggests the NWS should consider smaller warning polygons. Limited-size warnings would enable meteorologists to provide greater specificity regarding the location of anticipated significant snowfall, while simultaneously reducing the number of people who are unnecessarily warned.