WSNT21 CWAO 080324 CZQX SIGMET A1 VALID 080320/080720 CWUL- CZQX GANDER OCEANIC FIR/CTA SEV MTW FCST WI 60NM WID LINE BTN /N6330 W04250/ - /N6130 W04300/ FL200/360 STNR NC RMK=