Abstract: Analyses of surface potential temperature for one year over the contiguous United States, southern Canada, northern Mexico, and adjacent oceanic areas showed three regions of relatively high frequency of strong gradients. ...

Abstract: This paper examines the climatological, large-scale, and synoptic-scale aspects of South American cold surges using NCEP?NCAR gridded reanalyses for the 1992?96 period. Three common cold surge types are identified on the ...

Abstract: he temporal frequency and spatial distributions of fronts and troughs in the Great Lakes region from a 6-yr period (January 2000?December 2005) are presented. Frontal frequencies indicated that cold fronts were the most ...