The four recurving West Pacific TCs chosen for study are Typhoon (TY) David (1997), TY Opal (1997), TY Songda (2005), and Tropical Storm (TS) Haima (2005). Case studies of TY David and TY Opal are conducted in order to continue previous research by Harr and Elsberry on frontogenesis patterns associated with the recurvature of these two TCs. Case studies of TS Haima and TY Songda are chosen so that characteristics of a recurving TC yielding a relatively large downstream circulation impact (TS Haima) can be contrasted with a recurving TC yielding a relatively small downstream circulation impact (TY Songda).
Preliminary results indicate that the ability of a recurving West Pacific TC to produce a substantial reduction in predictability may depend upon whether a Rossby wave train is excited by the TC/large-scale flow interaction. Results also indicate that a Rossby wave train may be more likely to be initiated by the TC/large-scale flow interaction, and predictability to be reduced, when cyclonic rather than anticylonic wave breaking is induced.