modelman, I forgot to say that if there is mountain wave around, as there is frequently, then it is not unknown to encounter rotor at or near the threshold. Some weeks back I had been having an IMC lesson with the CFI, almost had the wheels on the ground when it became very unstable so started to go around. The CFI being very much more experienced in local conditions promptly took over and landed the aircraft - so don't beat yourself up about it and do come back to visit us again sometime.