WSOS31 LOWW 061646 LOVV SIGMET T01 VALID 061646/061800 LOWW- LOVV WIEN FIR FRQ TSGR FCST AT 1646Z WI N4848 E01349 - N4833 E01422 - N4755 E01331 - N4756 E01254 - N4808 E01240 - N4848 E01349 TOP FL370 STNR NC=