WSCN04 CWAO 180831
CZYZ SIGMET P4 VALID 180830/181230 CWUL-
CZYZ TORONTO FIR FRQ TS OBS AT 0830Z WI 40NM WID LINE BTN N4847 W07804 - N4606
W07922 TOP FL460 MOV ENE 25KT WKN=