WSCN05 CWAO 272039 CZUL SIGMET B1 VALID 272035/280035 CWUL- CZUL MONTREAL FIR FRQ TS OBS WI 50NM WID LINE BTN N4619 W07926 - N4713 W07800 - N4810 W07643 TOP FL480 MOV E 35KT NC=