When I first put the images together for this, I put lovely blue sky in the background outside the cockpit window. It was only when I reread my dialogue that I realised it might be better to show them flying in a storm.

Having said that, I'll just point out that the pilot doesn't actually say it's snowing. He just says there's snow on the runway - which could have been left behind by a previous non-thundery precipitation event. So there. :-)