In this picture, we can see an airport overlooked by bad weather. In the foreground, there is what seems to be an EasyJet A319 taxiing on a taxiway. In the background, despite the pretty blue and clear sky, we can see a massive cloud growing. This cloud might be a towering cumulus, a pre-stormy cloud. Behind the first TCU, we can see what looks like the top of an anvil, suggesting that there are other TCUs in the vicinity of the airfield. The airplane better take-off soon, otherwise it might get stuck on the ground.