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WSUY31 SUMU 270720

SUEO SIGMET 3 VALID 270720/271020 SUMU-
SUEO MONTEVIDEO FIR EMBD TS GR FCST WI S3357 W05828- S3013 W05749- S3006 W05641- S3430 W05509- S3357 W05828 TOP FL390 MOV E 05KT INTSF=