TXNT21 KNES 211821 TCSNTL A. 20L (SEBASTIEN) B. 21/1800Z C. 23.1N D. 60.5W E. THREE/GOES-E F. SUBTROPICAL G. IR/EIR/VIS H. REMARKS...THIS WILL BE THE FINAL BULLETIN UNLESS SATELLITE ANALYSIS SUGGESTS THE SYSTEM HAS BECOME PURELY TROPICAL IN NATURE. NO WARM CORE WAS FOUND ON COLD OR WARM CORE PAGE AND LACK OF TIGHT LOW-LEVEL CIRCULATION WHILE INTERACTING WITH FRONTAL BOUNDARY SUGGESTS SYSTEM IS SUBTROPICAL IN NATURE. I. ADDL POSITIONS NIL ...LEVINE