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What causes thunder and lightning as UK heatwave set to end with a bang

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several days of heatwave, which has seen parts of the country grapple with wildfires. Now a change in weather is imminent with the Met Office predicting thunderstorms over this week, bringing the unbearably hot weather to an end.

Though there will be rain, the thunderstorms are expected to bring more danger than relief after the heatwave. Met Office forecaster Dan Stroud explained that the "rain from really intense downpours will be unable to soak into the baked ground quickly", which he added can result surface run-offs and flooding.

Here's what you need to know about what causes thunder and lightning. Thunderstorms are caused by instability in the atmosphere, when warm air exists underneath much colder air, according to the Met Office.

As the warm air rises it cools and condenses as small water droplets. If there is enough instability in the air, the warm air rises rapidly and water vapour will form multi-level heavy clouds called cumulonimbus clouds.The water droplets will then combine to create larger droplets, which then freeze to form ice crystals, which start falling as hail once they become too heavy.

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