WSTU31 LTFM 250635
LTBB SIGMET 4 VALID 250635/250930 LTFM-
LTBB ISTANBUL FIR EMBD TS OBS AT 0635Z W OF LINE
N4029 E02712 - N3714 E02958 - N3600 E02959 TOP
FL330 MOV NE 20KT NC=