Analysis of a-typical tropical cyclone genesis during TCS08

During the summer of 2008 an extensive field program was conducted under TPARC/TCS08 in the western North Pacific. One of the many goals of the program was to evaluate tropical cyclone (TC) genesis under two conditions (1) a Pre-monsoon depression stage; and (2) a cyclogenesis stage in which the central convection and winds develop well inside of the region of gale-force winds associated with the outer convective bands. The program which covered from the beginning of August through the first week in October initially had to wait almost two weeks to get the first officially named and warned on system that fell within the field study area (one TC, TD10W formed during the first week, but moved out of the area too quickly to be studied). Over the following 6 weeks, 11 numbered TCs were warned on by the JTWC in the area of interest (including 4 TDs) and were evaluated by numerous means of detection and NWP analysis techniques. This paper, using primarily satellite-based remote sensing tools, discusses the unusual, a-typical, nature of development of many of the warned on (and un-warned on) TCs that formed during this period and provides a couple of suggestions on how to recognize these systems and how they might not have fitted into the typical mold of development as suggested above.