UK braces for hottest day on record with precautions put in place

Temperatures could hit 40C for the first time in the UK as train services are cancelled and health authorities warn of dangers.

The United Kingdom is on course for its hottest day on record on Monday with temperatures forecast to hit 40 degrees Celsius (104 degrees Fahrenheit) for the first time, forcing railway companies to cancel services and health authorities to put more ambulances on standby.

Much of Europe is baking in a heatwave that has pushed temperatures into the mid-40s Celsius in some regions, with wildfires raging across the tinder-dry countryside in Portugal, Spain and France.

The British government triggered a “national emergency” alert as temperatures were forecast to surpass the previous highest of 38.7C (102F), recorded in the Cambridge University Botanic Garden in 2019, on Monday and Tuesday.

“We’ve got a difficult 48 hours coming,” Kit Malthouse, a minister in charge of government coordination, told the BBC.

Commuters walk under a message board warning people of disruption over extreme heat at Victoria Station in London [Niklas Halle’n/AFP]

The London Underground metro network imposed temporary speed restrictions for Monday and Tuesday, meaning it would run a reduced service with journeys taking longer than normal. It urged commuters to travel only if essential.

The National Rail network also urged passengers to stay at home and said some services – including a key route between northeastern England and London – would not run during parts of Tuesday.

Jake Kelly from Network Rail said he hoped normal operations would resume on Wednesday, when temperatures are forecast to fall, but that would depend on “the damage that the weather does to the infrastructure over the next couple of days”.

Some schools were due to close earlier than usual on Monday.

The Health Security Agency (UKHSA) raised the heat health warning to Level 4 for England for Monday and Tuesday.

A road sign reads "Extreme Heat, Plan your journey, Carry water", warning motorists about the heatwave forecast
A road sign reads ‘Extreme Heat, Plan your journey, Carry water’ on the M11 motorway north of London [Damien Meyer/AFP]

Britain’s Meteorological Office defines a Level 4 alert as a national emergency, and is used when a heatwave “is so severe and/or prolonged that its effects extend outside the health and social care system. At this level, illness and death may occur among the fit and healthy, and not just in high-risk groups.”

The Met Office said “substantial” changes in working practices and daily routines would be required and there was a high risk of failure of heat-sensitive systems and equipment, potentially leading to localised loss of power, water or mobile phone services.

Malthouse said the government was prepared for the extreme weather and would seek to learn lessons from it.

“We definitely need to adapt the way we build buildings, the way we operate and look at some of our infrastructure in the light of what seems to be an increasing frequency of these kinds of events,” he told BBC Radio.

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