Decision height
Some years ago, we were coming in to land at Darwin on a Qantas 767. We overflew the airport on approach and I could see that there were some very dark clouds nearby with lots of rain visible underneath. As we crossed the boundary fence, the squall line was clearly visible ahead of us. We touched down in bright sunshine on a bone-dry runway and halfway through our landing roll the sky went dark and the heavens opened, with the type of heavy rain you rarely see outside the tropics. I'm sure the flight crew were keeping a close eye on the changing weather and, had the front sped up, I might well have had another go-around to add to my collection.