the UK has an amber warning declared for a heatwave this weekend, where temperatures will reach above 30C (86F). to many, especially Americans, this doesn't seem like a notable temperature, and i've seen many ignorant posts mocking UK residents who are worried about how they and their loved ones will be affected by the temperatures.
i'd like to explain why heatwaves in the UK are different than other parts of the world, and why they cause such a panic:
đ„ because we are an island nation, our heat isn't dry: it's horrendously humid. high humidity means that your lungs need to work harder to breathe, and it's much harder for your sweat to evaporate in the air. sweating is how your body regulates its temperature, and you sweat more in humid environments. when sweat doesn't evaporate it remains on the skin, leaving you feeling hot, sticky, and ill.
đ„ our homes and buildings are built to retain heat. because the UK is so cold and rainy for the vast majority of the year, our homes are supposed to trap heat, not let it out. not only are our homes smaller on average, but between double glazing, cavity wall insulation and loft insulation, when heat hits a British home, it causes a greenhouse effect. heat just sits in our homes, and it doesn't dissipate at night, meaning we are unable to sleep.
đ„ we have no air conditioning. i have never been in a home with air-con, and very few public buildings have it (except some shops). because of the aforementioned cold, rainy conditions that affect the UK for the vast majority of the year, air-con has never received a significant roll-out here. this means that we have little to no relief from being inside buildings besides being in the shade, and few homes even have fans.
đ„ our city centres are packed and highly urbanised, which causes heat traps. because our streets and homes are often stacked tightly together, including rows of houses/buildings/etc., heat in densely packed areas has nowhere to go, and will simply sit. trying to walk through a city during a heatwave will leave you sweating and exhausted in minutes. likewise, there are limited spaces to go to cool off during these temperatures: people will literally go to the shops to stand in the fridge/freezer aisles.
đ„ our infrastructure is not built to cope with heat. during heatwaves, our tarmac melts. the rails which hold our trains bend and warp. our grass catches fire. a few years ago, airport runways cracked and lifted in the heat, halting flights. the UK is brought to a standstill during high temperatures because our cities and towns are built for colder, wetter temperatures. add in the 16 hours of daylight we get during the summer, and you have a recipe for disaster.
đ„ the hottest temperature ever recorded in the UK is 40C (104F). this was in England, and in other UK countries, it's even lower: in Wales, it was 37.1C (98.78F); in Scotland, it was 34.8C (94.64F), and in Northern Ireland, it was 31.3C (88.3F). because these are our highest temperatures, many of us are unused to the symptoms which signify heat exhaustion or heat stroke.
i need to emphasise: people die during heatwaves. i highly encourage people to read about the 2022 UK heatwaves, which saw the deaths of nearly 3000 people (many of whom were elderly). we could do nothing but hunker down and survive the heat during this time, and it was especially dreadful for anyone who is older, disabled, and/or neurodivergent. so while 30C is not unheard of in the UK, any heatwave poses significant risks, including illness, disruption to transport, wildfires, and even death.
thanks for reading, and to everyone from outside the UK who's provided useful advice on keeping cool! i'm sure we'll be alright, but i'm hoping folks won't parrot misinformation about us just 'not being able to cope with the heat' đ
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