Just to note, I have seen a 50Kt drop off in about 50 Ft above touchdown, in the desert. (Desert Night time Jets). TIs a pretty hideous situation as you have to add a fair whack of power before you enter it. The clue is in the tower reporting winds calm whilst the air you are flying in is moving at 70 Kts on the nose!
can also get interesting if it is a tailwind component. Especially flying a jet without brakes.