The UK is bracing for an extreme heatwave this week, with a rare red heat health alert issued for six regions of England, sparking concerns over health, schools, and transport. The Met Office forecasts temperatures could exceed 37°C in the shade and rise to 38°C to 40°C in parts of England and Wales, as a heat dome settles over western Europe, intensified by human-driven climate change.
The hot conditions, accompanied by high humidity and very warm nights, will make it difficult for people to recover overnight, according to forecasters. The UK Health Security Agency (UKHSA) issued the red warning for the West Midlands, East Midlands, South East, South West, London, and east of England, effective from 1am on Wednesday until 11pm on Thursday. This alert indicates a risk to life even for healthy populations, with potential impacts on transport, food, water, energy supplies, and businesses.
Second Red Warning in UK History
This is only the second red heat health warning ever issued, following the first in July 2022 when temperatures exceeded 40°C for the first time in the UK. An amber alert has also been issued for the North West, North East, and Yorkshire and the Humber for the same period, meaning the impact is expected across the entire health service in those areas.
Dr. Agostinho Sousa, head of extreme events and health protection at UKHSA, urged health and social care services to prepare. "It is vitally important that people understand the risk posed by high temperatures like these," he said, advising simple actions like staying hydrated, avoiding the sun during the hottest part of the day, and keeping homes cool. He also emphasized checking on elderly relatives and those with underlying conditions.
Travel Disruptions and Infrastructure Risks
The Met Office has issued a red weather warning covering an area from London to Swansea and Somerset to Birmingham from 9am Wednesday to 9pm Thursday. It warns of substantial changes required in working practices and daily routines, along with a high risk of failure of heat-sensitive systems and equipment, potentially leading to loss of power, water, gas, or mobile phone services.
Rod Dennis, road safety spokesperson at RAC, warned of a possible record number of breakdowns as heat strains vehicles. He urged drivers to take warnings seriously and avoid non-essential journeys without effective air conditioning. The AA noted that gritters may be deployed on roads where surfaces soften or become sticky, with heavy traffic causing rutting. Edmund King, AA president, advised drivers to slow down and avoid harsh braking on damaged surfaces.
Rail and air travel are also expected to face delays and cancellations. The National Association of Head Teachers (NAHT) has issued guidance to schools on dealing with the heat, including impacts on pupils and staff, legal positions, and when to consider closure. Paul Whiteman, NAHT general secretary, said that while there is no legal upper temperature limit, school leaders will do all they can to mitigate effects.
Climate Change Intensifies Heat Dome
Scientists attribute the heatwave to a heat dome similar to last month's, where a high-pressure system stalls over a region, trapping heat. Akshay Deoras, senior research scientist at the University of Reading, described it as "a heat-dome driven furnace" that will push temperatures into exceptional territory. He noted that human-driven climate change has loaded the atmosphere with extra heat, making extremes more intense.
Bill McGuire, professor emeritus at University College London, warned that temperatures above 43°C are now possible in the UK's current climate, but infrastructure is not built for such conditions. Gareth Redmond-King of the Energy and Climate Intelligence Unit highlighted that the heatwave coincides with parliamentary debates on net zero plans, stating that temperatures will continue to rise until emissions reach net zero.
