WSZA21 FAOR 170843 FACA SIGMET B01 VALID 170831/171200 FAOR- FACA CAPE TOWN FIR SEV TURB FCST WI S3156 E03006 - S3300 E03200 - S3545 E02914 - S3551 E02839 - S3224 E03009 - S3156 E03006 SFC/FL055=