Met Office warns of potential early cold snap as polar vortex weakens

Britain is bracing for an Arctic plunge as a weakening polar vortex threatens to trigger the earliest major cold snap in recorded history. According to the Mirror ^[1], weather forecasting models suggest daytime temperatures could drop as low as -4C next week, with millions facing freezing conditions.

The phenomenon, known as sudden stratospheric warming, occurs when temperatures rise in the stratosphere, causing Arctic air to rush downward. The Daily Star reported ^[2] that this disruption could lead to wintry showers, ice, or snow, depending on local moisture levels. If winds reverse direction, it could mark the earliest such event ever recorded, beating the previous record set in November 1969 and 2025.

Data from the European Centre for Medium-Range Weather Forecasts (ECMWF) indicates that daytime highs could fall below freezing in 57 counties across the UK during Friday and Saturday. The Mirror ^[1] detailed that northern England could see midday highs of just -4C, while Scotland and Wales might hover between -1C and -3C. Even the warmest regions, such as East Anglia and the far south-east, are predicted to reach only 6C.

Met Office forecaster Marco Petagna explained that the polar vortex is currently weakening, allowing cold air to escape the North Pole. He noted that while this increases the chance of cold weather a few weeks down the line, it is not a guarantee. "It doesn’t always happen, it just increases the chance of it occurring," Petagna said, referencing last year’s similar event that did not result in significant cold for the UK.

The Daily Star ^[2] highlighted that England is likely to be the worst impacted, with temperatures potentially dropping to -4C. This comes as households struggle with the cost of living crisis, making heating costs a pressing concern. The ECMWF maps show the UK shaded in deep blue and purple, indicating temperatures well below the seasonal average.

While the current forecast points to a severe chill, experts urge caution. The Met Office ^[2] stated that a weaker vortex can create a meandering jet stream, allowing cold air to move south. However, the exact impact remains uncertain until the stratospheric warming event is confirmed. Brits are advised to keep warm as the mercury prepares to dive in the coming days.