WSYG31 LYYN 012100
LYBA SIGMET U02 VALID 012100/020100 LYBE-
LYBA BEOGRAD FIR
SEV TURB FCST SW OF LINE N4310 E01840 - N4225 E01930 AND NE OF LINE
N4135 E01920 - N4145 E01825 FL350/400 STNR NC=