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Over 50 regions are on high alert with emergency measures in place regarding water usage and care for the elderly. 0ur weather presenter sarah keith lucas has more on the effect of such heat domes. the long lasting heatwave that is gripping parts of southern europe, including france, is in part down to the formation of a heat dome. we have got hot and dry ground. as the sunshine hits the ground the air rises but gets trapped underneath this slow—moving area of high pressure, and with descendin...