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Jetstrøm

Jetstrømmer er smale strømmer med svært sterke vinder som flytter store luftmasser fra vest til øst. De påvirker værsystemer over hele verden. Jetstrømmer finnes typisk 9-16 km over jordens overflate, like under tropopausen. De dannes i overganger mellom luftmasser som har store temperaturforskjeller.

Klimaendringene påvirker jetstrømmene, og antas å forsterke såkalte «vandrende lavtrykk» langs den såkalte polarfronten. Dette er flere kalde værfronter som flyttes fra Arktis inn i mer sørlige breddegrader. De forårsaker gjerne uvanlig intense og lange perioder med frost og nedbør.

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