WSYG31 LYYN 280846
LYBA SIGMET U01 VALID 280850/281150 LYBE-
LYBA BEOGRAD FIR
SEV TURB FCST WI N4450 E01925 - N4515 E01930 - N4515 E02135 - N4435
E02250 - N4405 E02220 - N4450 E01925 SFC/FL050 MOV N NC=