****0000000181**** WSSG31 GOOY 231559 GOOO SIGMET C4 VALID 231605/232005 GOBD- GOOO DAKAR TERRESTRE FIR/UIR EMBD TS OBS AT 1555Z S OF LINE N0545 W00730 - N0922 W00249 TOP FL480 MOV W 15KT INTSF=