Storm Goretti has significantly impacted parts of the UK, with particular concern raised in Wales where an avalanche warning has been issued for Snowdonia. The warning comes amidst reports of 'thundersnow' – a rare meteorological event where thunder and lightning occur during a snowstorm – affecting various regions of the country. The Met Office has been closely monitoring the situation, issuing several warnings for snow and ice across the UK as a cold snap takes hold.
In Wales, the Snowdonia National Park Authority's warden service has highlighted the heightened risk of avalanches, particularly on higher ground where significant snowfall has accumulated. Strong winds accompanying the storm are contributing to the instability of snowdrifts, making conditions hazardous for walkers and climbers. Temperatures in the region are expected to remain around 0°C to 2°C, feeling considerably colder due to wind chill, with gusts potentially reaching 40-50 mph on exposed peaks.
Across England, yellow warnings for snow and ice are in place for parts of the North West, North East, and the Midlands, as well as areas of the South West. These warnings indicate potential for travel disruption, icy patches on untreated roads and pavements, and the risk of localised power outages. Overnight temperatures are forecast to drop to between -2°C and 0°C in many areas, with some rural parts seeing even colder conditions. Scotland and Northern Ireland are also experiencing widespread cold weather, with yellow warnings for snow and ice covering much of both nations, particularly higher ground where accumulations of 5-10cm of snow are possible.
The phenomenon of thundersnow, reported in parts of Wales, occurs when cold air aloft mixes with slightly warmer air near the ground, creating instability in the atmosphere. The heavy snowfall associated with Storm Goretti, combined with these atmospheric conditions, has led to this unusual and striking weather event. While not unheard of, it is less common than conventional thunderstorms and can be startling due to the muffled sound of thunder caused by the snow.
Met Office advice urges the public to exercise caution, particularly when travelling. Motorists are advised to check their routes before setting off, allow extra time for journeys, and ensure their vehicles are prepared for winter conditions. Pedestrians are warned about slippery surfaces and the potential for falling branches due to strong winds and heavy snow. Those planning outdoor activities in affected areas, especially mountainous regions, are strongly advised to reconsider or take extreme precautions and ensure they have appropriate equipment and experience.
Looking ahead, the Met Office indicates that cold conditions are likely to persist for several days, with further snow showers expected in some areas. While the intensity of Storm Goretti is expected to gradually diminish, the residual effects of snow and ice will continue to pose challenges across the UK.