THE PLT HAD BEEN BRIEFED ON FORECAST STRONG WINDS & A SIGMET FOR MODERATE TO SEVERE TURBULENCE. WITNESSES OBSERVED THE ACFT MAKE A SERIES OF APPROACHES TO RWY 24. ON THE 1ST APPROACH THE ACFT WAS ALMOST OVER THE THRESHOLD AS THE BASE TURN WAS COMPLETED. THE WINGS WERE ROCKING FROM SIDE TO SIDE. WIND WAS OUT OF THE NORTH WITH THE WINDSOCK FULLY EXTENDED PERPENDICULAR TO THE RWY. DURING THE GO-AROUND THE ACFT WAS OBSERVED CRABBING INTO THE WIND. DOWNWIND FOR THE 2ND APPROACH WAS EXTENDED, HOWEVER, THE ACFT WAS 50-100 FT AGL AT THE THRESHOLD. A 2ND GO-AROUND WAS INITIATED 1/3 DOWN THE RWY. THE DOWNWIND LEG FOR THE 3RD APPROACH WAS EXTENDED EVEN FURTHER. THE APPROACH APPEARED TO BE SLOW. THE 3RD GO- AROUND WAS INITIATED 100-150 FT AGL NEAR THE APPROACH END OF THE RWY. A SLOW CLIMBING TURN WAS MADE TO THE LEFT. AS THE ACFT BEGAN A 2ND CIRCLE THE NOSE PITCHED UP & THE ACFT STALLED. LINE PERSONNEL ESTIMATED THE WINDS AS 350 DEG AT 20 KTS GUSTING 28 KTS.