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Jetstrøm

Relativt smalle strømme af meget stærke vinde, som bevæger store luftmasser fra vest til øst og påvirker vejrsystemerne rundt om i verden. Jetstrømme findes 9-16 km over jordens overflade lige under tropopausen. De dannes ved grænserne af tilstødende luftmasser med betydelige temperaturforskelle, såsom polarområdet og den varmere luft mod syd.

Klimaændringer påvirker jetstrømmen, der forårsager såkaldt ”vandrende jetstrømme”; når jetstrømmen følger en “bølget” uregelmæssig sti, bliver flere kolde vejrfronter kastet syd fra Arktis ind i mellembreddegrader, hvilket indebærer frysningstilstande, der vedvarer i uger ad gangen (fx rekordkalde, snedrevne vintre).

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