Checked: November 6, 2026, at 09:07 UTC (09:07 GMT in London).
The polar vortex high above the Arctic is unusually disturbed for early November, and there are signs that a sudden stratospheric warming may be developing. Such an event can increase the chances of colder weather in the UK weeks later, but the Met Office says the current disturbance is not a forecast of an imminent cold spell.
In its November 4 assessment, the Met Office reported that the vortex was stretched and that forecasts suggested it would move farther from the North Pole. Some forecast scenarios showed its winds briefly reversing in the following week, potentially meeting the definition of a major warming. Whether that reversal will happen remains uncertain.
Destaques
The Met Office says large atmospheric waves have been disturbing the vortex from opposite directions, stretching its normally more circular shape. Its November 4 analysis said the disturbance was unusually strong for the time of year and could displace the vortex from the pole.
Forecast models produce a range of possible outcomes, known as an ensemble. In that assessment, many individual forecasts suggested that the normally west-to-east winds could reverse briefly, but the expected reversal was weak and short-lived. A possible major event should therefore not be treated as a confirmed one.
The Met Office also identified a possible connection with the current El Niño in the tropical Pacific. El Niño can alter atmospheric circulation and strengthen waves that travel upward from the lower atmosphere. It is one influence on the odds of a warming, not a way to predict an individual UK cold spell.
The stratospheric polar vortex is a large circulation of strong winds surrounding a pool of very cold air over the Arctic. It forms high in the stratosphere, roughly 10 to 50 kilometers above Earth's surface, and is most prominent during the Northern Hemisphere winter.
It is different from the weather systems people experience at ground level. Those systems develop mainly in the troposphere, the atmospheric layer below the stratosphere. The two layers can influence each other, but a change high above the Arctic does not translate automatically into a particular forecast for a town or city.
A strong, relatively stable vortex tends to support a stronger Atlantic jet stream, the fast-moving current of air that helps steer weather systems. For the UK, that pattern often favors winds from the west and milder, wetter and windier conditions. When the vortex is weakened, the odds can shift toward a more meandering jet stream and colder outbreaks, according to the Met Office's explanation of the vortex.
A sudden stratospheric warming, often shortened to SSW, is a rapid rise in temperature high above the polar region. The warming occurs in the stratosphere, so it does not mean people at the surface suddenly feel warmer.
Large waves in the lower atmosphere can travel upward and disturb the circulation around the Arctic. As the vortex weakens, air in the polar stratosphere descends and compresses, causing temperatures there to rise. The vortex may move away from the pole or split into separate circulations. In a major SSW, the usual westerly winds reverse in the middle stratosphere.
The Met Office notes that temperatures in the stratosphere can rise sharply over a few days. The key point for a UK forecast, however, is how the atmosphere responds afterward, not just the size of that temperature change.
Sometimes the effects of a disturbed vortex extend downward and influence the jet stream. That can make long-lasting areas of high pressure, known as blocks, more likely. A block can interrupt the usual path of Atlantic weather systems and change the direction from which air reaches the UK.
Where the high pressure settles matters. High pressure over the UK can bring quieter, drier weather, with frost or fog possible. A block to the north or northeast can favor easterly winds and colder air; a block to the west can make northerly winds more likely. If cold air and sufficient moisture coincide, some areas may see sleet or snow showers.
Those are scenarios, not promises. Some warmings have little lasting effect on UK weather, while others have their strongest impacts elsewhere. The position of pressure systems, the jet stream and other atmospheric influences all matter. An early-season disturbance also occurs when less cold air is generally available across the Northern Hemisphere than later in winter.
The Met Office says that, when an SSW's effects reach the lower atmosphere, they can do so over the following two to six weeks. There is no fixed countdown: a warming may fail to produce a clear surface response, and the resulting weather can vary by location.
For practical planning, check the Met Office UK forecast and local warnings as the date gets closer. A long-range signal can help explain a change in risk, but a shorter-range forecast is more useful for decisions about travel, frost or possible snow in a specific place.
No. It can increase the chance of a colder pattern, but snow also requires suitable temperatures, moisture and local weather conditions.
No. The stratospheric polar vortex circulates high above the Arctic. The jet stream relevant to UK weather is lower down and helps steer weather systems across the Atlantic.
The Met Office's November 4 assessment described a possible brief wind reversal in the following week, with uncertainty over whether a major event would occur. That assessment did not confirm one.
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