The 23rd Conference on Hurricanes and Tropical Meteorology

11A.8
HISTORIC SPECULATION AND CATEGORIZATION OF SUBTROPICAL CYCLONES IN THE WESTERN ATLANTIC BASIN

Jonathan Byrne, Consulting Meteorologist, Watertown, MA

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

The 23rd Conference on Hurricanes and Tropical Meteorology