WSBC31 FBSK 042100 TAF FBGR SIGMET A01 VALID 042050/050050 FBSK- FBGR GABORONE FIR FRQ TS OBS WI S2513 E02210 -S2354 E02471- S2346 E02615 -S2456 E02534- S2513 E02210 TOP FL520 MOV E INTSF=