A rare red weather warning for extreme heat comes into force across parts of Essex at 9am today, with temperatures forecast to climb as high as 39C.
The Met Office warning runs from 9am on Wednesday until 9pm on Thursday and covers areas including Grays, South Ockendon, Purfleet, Warley, Harlow and Chipping Ongar.
What is a red heat alert?
Forecasters say an “exceptional” spell of hot and humid weather is expected, with impacts likely across the general population, not just those who are most vulnerable.
The warning highlights a risk of adverse health effects, “substantial changes in working practices and daily routines” and a high chance of heat-sensitive systems and equipment failing, potentially affecting power and other essential services.
The UK Health Security Agency (UKHSA) has also issued a red heat health alert for the whole of Essex from 1am on Wednesday until 11pm on Thursday – its highest level, signalling severe impacts on health and social care and an increased risk to life.
School closures and changes during extreme weather
Some schools across Essex are closing or shortening the school day due to the extreme heat, while others are relaxing uniform rules to help pupils stay cool.
Parents are being urged to check their child’s school website and the Essex County Council emergency closures page before setting off, as closure lists are being updated as schools notify the council.
In many cases, pupils are being allowed to wear PE kits instead of full uniform, and some schools are advising that blazers and ties are not required during the heatwave.
You can see a full list of school closures here.
Travel disruption expected during heat alert
Road and rail networks are expected to be affected, with the potential for speed restrictions, track issues and overheated vehicles leading to delays and cancellations.
Travellers are advised to check for updates before setting off, carry water and a hand-held fan, and get off at the next stop if they start to feel unwell while on public transport.
Drivers are also being urged to plan journeys carefully, avoid travelling in the hottest part of the day if possible, and be prepared for breakdowns or congestion.
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How to stay safe in the heat
Public health officials say people should drink plenty of fluids, stay out of the sun between 11am and 3pm where possible, and keep homes cool by closing curtains in sun-facing rooms.
Those who need to go outside are urged to stay in the shade, wear sunscreen and a wide-brimmed hat, and carry water.
The Met Office also advises taking extra care around water, recommending people enter gradually rather than jumping into rivers, lakes or the sea to avoid cold-water shock.
People are encouraged to choose lifeguarded beaches or supervised swimming areas if they are heading to the coast or open water.
Who is most at risk
Older people, young children, those with underlying health conditions and anyone living alone are at higher risk of becoming seriously unwell in the extreme heat.
The public is being asked to check in on neighbours, friends and family members who may need help to stay cool and hydrated.
If you are worried about your own health, or someone else’s, during the heatwave, you are advised to call NHS 111 for guidance.
How hot could it get?
The current UK record for the hottest June day is 35C, set in the 1970s, but forecasters say temperatures in Essex could reach the high 30s and potentially challenge that record.
Humid conditions and “tropical nights” – when temperatures stay above 20C overnight – are expected to make it feel even more uncomfortable than previous heatwaves.
