WSCN04 CWAO 180441
CZYZ SIGMET P1 VALID 180440/180840 CWUL-
CZYZ TORONTO FIR FRQ TS OBS WI 20NM WID LINE BTN N4719 W08244 - N4653 W08442 -
N4628 W08355 - N4617 W08220 TOP FL460 MOV ENE 25KT NC=