The purpose of this presentation is to describe and categorize the behavior of CTDs from a climatological and case study perspective. This research expands upon previous work by utilizing high–resolution data (NCEP GFS initialized gridded datasets obtained from NCAR) for the extended cool season of September through May (1999–2004). Subjective tracking of the disturbances on the DT for the 2002–2003 season provides a basis for selecting case studies as well as setting a standard for comparison with a more comprehensive, objectively generated climatology for 1999–2004. Preferred regions of genesis, lysis and tracks of CTDs will be presented. In addition, categorization of CTD behavior will be described based upon track, as well as interaction with the western Atlantic and western Pacific jet streams. This study expands upon prior work in describing the effect of interaction of these disturbances with jet streaks and the potential for intense cyclone development. Preliminary findings indicate several categories of CTD behavior ranging from short-lived disturbances with origins along the southern periphery of the CPV, to long-lived (3–6 weeks) disturbances with polar origins that eventually migrate to the southern periphery of the CPV, frequently invigorating the adjacent jet stream. Three main regions of origin are: 1) Northern Hudson Bay extending to the adjacent Elizabeth Islands and Arctic Ocean; 2) Siberia and the adjacent Arctic Ocean; and 3) Sea of Okhotsk (north of Japan) extending to Eastern Mongolia. The main regions of CTD lysis are over the northwestern Atlantic and Pacific Oceans.