Why we are now struggling in fall weather: the phenomenon of the jet stream explained

Armand Pien still appears to be right: it is all the fault of the jet stream. One moment you have a wonderful late summer, the next moment it is cloudy and rainy during autumn. From today, this weather phenomenon seems to be a drop for a long time. But what exactly is that? How does it determine us again? And how long will that changingness persist? HLN science journalist Martijn Peters explains.

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