WSCN04 CWAO 031253
CZYZ SIGMET B4 VALID 031250/031650 CWUL-
CZYZ TORONTO FIR SEV ICE (FZRA) FCST WI N4837 W07805 - N4616 W07010 - N4728
W06921 - N4828 W07055 - N4904 W07805 - N4807 W08517 - N4710 W08422 - N4837
W07805 SFC/FL050 MOV ENE 15KT NC=