TXPN21 KNES 200354 SIMWIR A. 15W (CHOI-WAN) B. 20/0230Z C. 34.2N D. 147.8E E. THREE/MTSAT F. EXTRATROPICAL G. IR/EIR/VIS H. REMARKS...CHOI-WAN IS UNDERGOING RAPID EXTRATROPICAL TRANSITION. CENTER IS VOID OF ANY DEEP CONVECTION AND IS INTERACTING WITH FRONTAL BOUNDARY ON ITS NORTHERN PERIPHERY. THIS WILL BE THE FINAL BULLETIN. I. ADDL POSITIONS NIL ...RUMINSKI