There has been some confusion and a delay in modifying this abstract. Regina Dobson and Kevin O'neil at the AMS Abstract Center have a record of the e-mail message they received by the July 1st deadline; here is the abstract. The conference I am modifying the abstract for is January 1999.
The rapid intensification and spin-up of extratropical cyclones in the Western Atlantic Basin can result in precipitation and circulation patterns of a magnitude more charscteristic of tropical cyclones. Conversely, the tropical cyclones undergoing extratropical transformation in the mid-latitudes display features more typical of intense extratropical cyclones. It is possible the evolutionary pathways for these respective cyclone types converge in a new category of hybrid cyclones, or "subtropical cyclones". This category may be divided into two types, i.e., "warm" cone" and "cold cone" cyclones. Historic case studies such as the "No-Name Storm" of October 1991 in New England, and hurricane Edna of 1954 will be used to illustrate both evolutionarypathways and subtype