Met Office gives winter update as experts explain Polar Vortex | UK | News
The Met Office has shared an early forecast for next winter, suggesting that the season will likely start with average or slightly milder weather than normal. Although it is still too early for definitive predictions, this initial forecast indicates that the winter will be less severe; Temperatures are expected to be close to or above seasonal norms.
This could mean fewer cold spells and a more manageable transition into the colder months. According to the three-month outlook from October to December, there was a 55 percent chance of temperatures being “near average” and a 30 percent chance of being “mild.” Weather experts have warned that the intensity of the upcoming winter may depend on how the Polar Vortex develops in the coming months.
The Polar Vortex is a large area of low pressure and extremely cold air surrounding the Earth’s poles, particularly the North Pole in the Northern Hemisphere. It is always found near the poles but becomes stronger during the winter months. The term “vortex” refers to the counterclockwise flow of air that helps control frigid temperatures in the polar region.
TV weather presenter John Hammond, who worked for the BBC and the Met Office, said: Daily Mail: “These high-level westerly winds surrounding the Arctic in winter are often strong and help ‘blanket’ cold air over the Arctic.
“But we are currently in a naturally occurring cycle phase known as the ‘Semi-Biennial Oscillation’ where the polar vortex may tend to weaken more than in some other winters, allowing cold Arctic air to move out and reach us more easily.
“In this range, computer models cannot reliably determine the extent and timing of these natural cycles.
“It may be tempting to cherry-pick model runs showing this winter’s cold consequences for the UK, but they should not be relied upon. Most computer outputs currently suggest next winter will be mild.”
He explained that another factor affecting global weather is La Niña, the cooling of the tropical Pacific Ocean.
When the polar vortex remains weak for a long period of time during winter, it can disrupt typical weather patterns and cause cold air from the Arctic and continental Europe to move south towards Britain. This shift often leads to significantly colder conditions than normal, as the weakened vortex is unable to retain cold air near the poles. As a result, the UK could experience sharp drops in temperature, increased frost and even snow, depending on how long the outage lasts.
A Met Office spokesman explained that although the chances of cold weather between October and December are generally low, there is an increased chance of colder weather towards the end of this period.
He noted that these forecasts are influenced by global climate patterns, including the Semi-Biennial Oscillation and the developing La Niña. However, when it comes to the polar vortex, which could have a major impact on winter weather in the UK, he stressed that current atmospheric conditions do not fully predict how strong or weak it will be later in the season.
