Polar vortex weakens early, raising Europe cold risk — SkimNews
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- Stratospheric polar vortex shows signs of unusually early weakening, with forecast models indicating significant disruption within 10 days despite typical seasonal strengthening at this time
- Major sudden stratospheric warming (SSW) event is possible, marked by rapid temperature rises of up to 50°C in days and potential reversal of westerly winds, though a full reversal remains uncertain
- Polar vortex typically contains Arctic cold air via strong anticlockwise circulation, but its disruption could allow cold air to spill into mid-latitudes, increasing chances of persistent high pressure and colder conditions in northern Europe
- Earliest recorded major SSW occurred on 28 November 1968, setting a historical benchmark as current models point to a similarly early-season event with implications for early winter weather patterns
- Northern Europe faces increased likelihood of colder, more settled conditions in the coming weeks if the vortex disruption propagates downward, though severe cold is not expected in the immediate two- to three-week window
Why it matters: An early polar vortex weakening could shift winter weather patterns weeks in advance, increasing energy demand risks and agricultural exposure in northern Europe. The timing breaks the typical seasonal rhythm, making forecasts less predictable and preparedness more urgent for utilities and emergency planners.
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