Eleven southern and central European countries have issued extreme heat warnings amid a brutal heatwave nicknamed Lucifer, with residents and tourists urged to take precautions and scientists warning worse could be still to come. Authorities in countries including Italy, Switzerland, Hungary, Poland, Romania, Bosnia, Croatia and Serbia are on red alert, the European forecasters’ network Meteoalarm said, and swaths of southern Spain and France are on amber. The highest temperature on Thursday was 42C in Cordoba, Spain, and Catania, Italy. Split in Croatia also hit 42.3C on Wednesday. The spell is forecast to peak at the weekend with temperatures of 46C or higher in Italy and parts of the Balkans.