Windshear

We were on final for runway 32L. The the radar picture on the navigation display looked like a child's colouring book, with greens, yellows, reds and even some purple here and there.

There was a nice sploch of red (thundercell) on the approach path about 3 miles from the runway and it was producing the most powerful rain I have ever seen.

The wind was 320/25 gusting 30. Strong, but right down the runway.

We saw the approach lights about 2 miles out, and the swimming pool of a runway shortly afterwards. We already knew this would be an interesting landing and we were all psyched up: positive touchdown, full reverse, pay close attention to directional control and braking at all times.

"Two Hundred - Minimum" - "Visual, continue"

"One Hudred"

Then it happened, like magic the wind shifted 30° left and we shifted 50 feet right so that we were approaching the runway edge lighting rather than the centreline. It was too late to make a heroic sideslip and continuing could have meant putting one wheel in the mud. Captain called "go-around" and we did, as the radar altimeter read 75 feet.

We went around, calmed down and landed 10 minutes later without further ado. The aircraft ahead of us and behind us didn't feel anything.

There's a saying in aviation that you haven't committed to a landing until the airplane is too slow to fly. How true.

S.