Europe could face colder weather as polar vortex weakens
Summary
Forecast models indicate that the Arctic polar vortex could weaken unusually early over the next 10 days. This may raise the chance of colder, more settled weather in northern Europe later in the season, though severe cold is unlikely in the next two to three weeks.Key Facts
- The polar vortex is a large area of low pressure and cold air high above the Arctic.
- The vortex usually strengthens during autumn and winter, helping keep the coldest air near the pole.
- A sudden stratospheric warming can rapidly raise temperatures high in the stratosphere and weaken or reverse winds around the vortex.
- Models favor a significant weakening, but a full wind reversal needed for a major sudden stratospheric warming remains uncertain.
- A major sudden stratospheric warming could affect weather patterns in the following weeks and increase the chance of colder conditions in northern Europe.
- Heavy rain and strong winds are forecast for central and southern Italy on Monday.
- More than 100 millimeters of rain could fall in 24 hours over higher ground in southern Italy.
- The low-pressure system is expected to move across the Ionian Sea toward Greece.
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