The UK is bracing for another sweltering day as a red extreme heat warning has been extended across London and parts of south-east England, including Friday in its sights. The Met Office's most severe alert signifies a critical risk to life and widespread disruption, with the public urged to take immediate precautions.
Originally issued for Monday and Tuesday, the extension reflects a sustained period of exceptionally high temperatures forecast for the capital and surrounding areas. Health impacts are likely to affect the entire population, not just vulnerable groups, including those with pre-existing conditions, the elderly, and very young children, who may experience serious illness or danger to life.
Temperatures in London and parts of the south-east could reach or even exceed 40°C during peak heat hours. Overnight temperatures will remain high, offering little respite and exacerbating health risks. Light winds mean minimal cooling effect.
The red warning also highlights a significant likelihood of transport disruption. Buckling roads, speed restrictions on rail tracks due to warping, and potential for buckled track sections may cause delays, cancellations, and overcrowding in public transport services, including Tubes and trains. Essential services face strain, including healthcare and emergency response teams.
Amber extreme heat warnings remain in place for much of England and Wales, as well as parts of southern Scotland, indicating a high risk to health and potential disruption. Northern Ireland has been downgraded to a yellow warning, still posing some risk.
The Met Office advises staying indoors during the hottest hours (11:00-16:00), keeping hydrated with plenty of water, and for employers to review working conditions and make necessary adjustments to protect staff.