Red extreme heat warning issued for parts of UK

UK Braces for Record-Breaking Heatwave as Red Warning Issued

The United Kingdom is facing an unprecedented early-summer heatwave, with the Met Office issuing a rare red extreme heat warning for parts of England and Wales. Temperatures are forecast to soar into the high 30s Celsius, potentially reaching 40°C, which would shatter the existing June record of 35.6°C set during the historic heatwave of 1976.

The red warning, only the second of its kind since the extreme heat alert system was introduced in 2021, comes into force from 9 a.m. on Wednesday and remains in place until 9 p.m. on Thursday. It covers an area stretching from London to Swansea and from Somerset to Birmingham. A broader amber warning is already in effect across much of England and Wales, with the heat expected to spread further north later in the week.

Impacts on Health, Schools, and Transport

Health officials have warned that the extreme heat poses a risk to the wider population, not just vulnerable groups such as the elderly, young children, and those with underlying health conditions. The high humidity accompanying this heatwave makes it particularly dangerous, as the body struggles to cool down through sweating when the air is already saturated. Overnight temperatures are expected to remain above 20°C in many areas, creating “tropical nights” that offer little respite.

In response, hundreds of schools across England and Wales have announced closures or early dismissals to protect students. At least 312 schools are fully or partially closed this week, according to reports. Transport operators have also taken action: Britain’s biggest train operator has advised passengers not to travel on Wednesday or Thursday due to the risk of heat-related disruptions, including rail buckling and signal failures.

Thunderstorms and Lightning Strikes

The heatwave was preceded by a dramatic night of thunderstorms, with 26,000 lightning strikes recorded across southern Britain. The London Fire Brigade responded to around 400 calls overnight, including two house fires believed to be caused by lightning strikes and incidents of flash flooding. In Bristol, a house roof caught fire after being struck by lightning, though no injuries were reported. The storms caused flooding on roads and delays on London’s transport network, including services to Heathrow Airport.

Climate Context and Future Projections

This week marks the 50th anniversary of the start of the 1976 heatwave, which remains etched in public memory for its scorching temperatures, dried-up reservoirs, and water shortages. Scientists from the University of Reading and the Met Office have used the anniversary to release new projections showing that climate change is making such events more intense. If a 1976-style heatwave occurred today, it would be 3–4°C hotter, with longer spells of extreme heat. Looking ahead to 2056, models suggest that similar weather patterns could bring several days of 40°C heat, with peaks of 45°C in parts of the Midlands—conditions currently associated with Dubai.

Speaking at London Climate Action Week, the UN Secretary General warned that “London is cooking” and that the world is closer to catastrophe, linking the extreme weather to the broader climate crisis.

Advice for the Public

Health authorities are urging people to stay hydrated, avoid direct sunlight during the hottest part of the day, and check on vulnerable neighbours. Those heading to beaches, parks, or open water are reminded to take extra care, as the risk of drowning increases in hot weather. The Met Office advises keeping curtains closed during the day, using fans or cool showers, and never leaving children or pets in parked cars.

As the UK swelters under this historic heatwave, the message from officials is clear: take the warnings seriously, plan ahead, and look out for one another.