WSZA21 FAOR 051747 FAJO SIGMET C01 VALID 051800/052200 FAOR- FAJO JOHANNESBURG OCEANIC FIR SEV TURB FCST WI S6012 W01000 - S6020 W00131 - S7025 E00543 - S6920 W01000 - S6012 W01000 FL140/180=