WSAU21 AMMC 051810

YMMM SIGMET I04 VALID 051845/052245 YMMC-

YMMM MELBOURNE FIR SEV TURB FCST WI S3520 E08920 - S3410 E09820 -

S3532 E10948 - S4450 E12940 - S4620 E12410 - S3906 E10949 - S3720

E09920 - S3839 E08855 FL160/260 MOV E 20KT NC=