An Amber Extreme heat warning, which is an impact-based warning designed to highlight impacts to protect lives, property and infrastructure, has been issued for Sunday, Monday and Tuesday.
Temperatures are likely to peak in excess of 35C in southern, central and eastern areas of England, and more widely around 32C within the warning area. Tuesday currently looks to see the peak of this heat, although exceptional warmth is likely throughout the warning period.
Temperatures are also set to remain high overnight, particularly in urban areas, with a high likelihood of tropical nights – when minimum temperatures don’t drop below 20C – for some early next week.
A Level 3 UK Health Security Agency Heat Health Alert, which is aimed at those specifically in the health and social care sector, has also been issued by the from Saturday to Tuesday, advising people to look out for vulnerable people and those with underlying health conditions.
Heatwave criteria, when specific temperature thresholds must be exceeded three days running, had already been met in some locations earlier this week, and are expected to be met again by early next week. This is most likely across England and Wales, but also fairly likely for eastern Scotland too.
Warm summer conditions will remain in place for much of the week for the majority of England and Wales, albeit slightly less hot on Thursday, when temperatures are more likely to peak in the mid-20s Celsius for many.
High pressure near the southern half of the UK is responsible for this week’s warm spell and builds back into the UK for Thursday, bringing largely dry and clear weather for many for the rest of this week. During the weekend, a developing southerly flow will allow very high temperatures currently building over the continent to start to spread northwards into the UK. Further north, eastern areas of Scotland could see temperatures in excess of 25C in a few places, well above their average for the time of year.
Met Office Deputy Chief Meteorologist Tony Wardle said: “Maximum temperatures have been well above average almost everywhere in the UK this week, the exception perhaps being the Western and Northern Isles of Scotland. Following a return to nearer average, locally rather cool temperatures over the next few days, the hot weather looks likely to steadily ramp up once again this weekend, peaking early next week.
“From Sunday, but more likely Monday and Tuesday, peak maximum temperatures are likely be in excess of 35C, especially across central, southern and eastern England, with a chance of some locations being even hotter. Elsewhere, maxima will generally range from high 20s to low 30s of Celsius. This, coupled with overnight minima not falling below 20C in many locations, has considerable potential to cause widespread societal impacts, which is behind the issue of an Amber Extreme heat warning.”
Dr Agostinho Sousa, Head of Extreme Events and Health Protection at UKHSA, said: “Heat-health alerts have now been issued to the majority of the country, with temperatures set to remain consistently high throughout the duration of this week.
“Most of us can enjoy the hot weather when it arrives, but it is important to keep yourself hydrated and to find shade where possible when UV rays are strongest, between 11am and 3pm.
“If you have vulnerable family, friends and neighbours, make sure they are aware of how they can keep themselves protected from the warm weather.’’
Peter Jenkins, Director of Campaigns, Water UK said: “Water companies are seeing substantial demand during this extremely hot weather. We can all help ensure there’s enough to go around by being mindful of the amount of water we use while ensuring we stay hydrated and safe.
“By making just small changes indoors or in the garden you can have a big impact on our water consumption. Our Water’s Worth Saving campaign has a host of helpful top-tips showing the simple things we can all do to save this precious resource, so it remains readily available now and in the future.”
Mel Clarke, Customer Service Director for Operations at National Highways, said: “It is always important to plan ahead for your journey and this advice is no different during periods of hot weather. Our advice is that everyone should check their vehicles, such as tyres, coolant and oil levels, before heading out.”