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WSGL31 BGSF 171820

BGGL SIGMET U04 VALID 171820/172220 BGSF-
BGGL NUUK FIR SEV TURB FCST AT 1820Z WI N6742 W03820 - N7025 W02520 -
 N7005 W02149 - N6836 W02610 - N6746 W03155 - N6555 W03518 - N6742 
W03820 SFC/FL130 STNR WKN=