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What is a 'heat dome' - and how long is it set to affect the UK?

Most of Europe is right now baking in a so-called "heat dome" - conditions a bit like a pizza oven, which are scorching Spain, France, Italy, Greece and beyond.

Meanwhile, temperatures in the UK could soar to a rare 34C (93.2F) today - meaning it could be hotter than Mexico, Barbados and Jamaica. So, what's going on with our weather? Follow latest: Amber heat health alert extended to more areas What is a heat dome? A heat dome forms when an area of high pressure lingers over a region for days or weeks.

This pressure traps hot air - like the dome of a pizza oven or a lid on a saucepan - and bakes the air and land beneath. As the ground parches, it absorbs heat - making conditions hotter still.

The dome of high pressure also blocks out clouds and cooler air, resulting in clear skies and persistent heat. Find out the latest forecast for your area What effect is the heat dome having on the UK? The current heat dome is hovering across most of Europe, while the UK sits just on the cusp of it.

That means the same high pressure bringing plus 40C (104F) temperatures to southern Europe is also roasting southern and eastern England on Monday and Tuesday. Temperatures could soar to 34C (93.2F) in London and the southeast today - a "relatively rare event, with just a handful of days [of 34C] since the 1960s.

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