BRITISH holidaymakers in Europe have been warned to avoid alcohol during the fierce "Cerberus" heatwave that is set to send temperatures soaring up to 49C. And two brothers, aged six and seven, died after they jumped into a reservoir in Manfredonia in southern Italy, reportedly to cool down. The country has been hit by heatwave Cleon with temperatures reaching an average of 42C to 43C across the country. The anticyclone is also affecting France as a red weather alert is in place in the eastern and southern parts of the country. The high temperatures are followed by thunderstorms and strong winds as multiple regions across the country were issued with tier-three orange alert weather warnings.