Wasgij? Original Puzzle 38 - Market Meltdown (1000pc)

Wasgij Original 38: The Dutch cheese market is busier than ever, with locals and tourists alike gathering to purchase some local delicacies – even the dark clouds can’t dampen their spirits! Luckily for them, the sun has broken through the gloom and started to shine brightly on the market stalls below, but why does the sudden change in weather take everyone by surprise?

What has the cheesemonger seen that’s stopped him in his tracks? That is the image you need to puzzle.