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Heatwave set to hit UK

17 July 2014 Last updated at 10:25 BST

Today is forecast to be the hottest day of the year so far - and tomorrow it's going to be even hotter!

It's all to do with sticky, humid air drifting in from the Mediterranean.

Health officials have issued a heatwave alert for large parts of the country.

They say you should take precautions to keep as cool as possible.