WSZA21 FAOR 170411 FACA SIGMET B01 VALID 170357/170600 FAOR- FACA CAPE TOWN FIR SEV TURB FCST WI S3143 E02942 - S3300 E03200 - S3540 E02919 - S3553 E02842 - S3249 E02827 - S3143 E02942 SFC/FL050=