WSCN25 CWAO 272039 CZUL SIGMET B1 VALID 272035/280035 CWUL- CZUL MONTREAL FIR FRQ TS OBS WI 50NM WID LINE BTN /N4619 W07926/5 S CYYB - /N4713 W07800/45 S CYVO - /N4810 W07643/45 E CYVO TOP FL480 MOV E 35KT NC RMK GFACN33/CZYZ TORONTO FIR SIGMET L4=