The Met Office has issued yellow thunderstorm warnings across much of England, Wales and parts of Scotland as the recent heatwave gives way to potentially dangerous weather conditions bringing heavy rainfall, lightning and hail.
The alerts take effect from late afternoon today and extend into the weekend, with forecasters warning that intense downpours could trigger localised flooding, particularly in urban areas where drainage systems may be overwhelmed. Wind gusts of 30-40 mph are expected in exposed areas during storms.
England's central, southern and eastern regions face the highest risk, including major cities such as London, Birmingham and Manchester. Much of Wales is covered by the alert, with particular concern for southern and eastern areas. In Scotland, the central belt and southern uplands are included in the warning zones. Northern Ireland, whilst not under immediate thunderstorm warnings, is also expected to see weather patterns shift away from recent heat.
Temperatures, which reached the high 20s and low 30s Celsius in recent days, are forecast to moderate to the low-to-mid 20s. However, humid conditions will persist, providing the energy needed for these convective storms to develop.
Travellers face potential disruption to road, rail and air services, with sudden reduced visibility and hazardous driving conditions possible. Power cuts and building damage from lightning strikes or falling debris also pose risks. The Met Office advises the public to secure loose garden furniture and avoid walking or driving through floodwaters.
The transition from heatwave to thunderstorms represents a typical meteorological shift, as cooler, unstable air interacts with residual warmth and moisture. Whilst the storms may provide some relief from the heat, they bring significant risks requiring public vigilance and preparation.