The "Kleon" heat wave is in full swing throughout Greece. According to meteorologists, this Friday is considered one of the hottest days with temperatures up to 44 degrees Celsius in Sterea and Thessaly. In addition, a level 3 health alert was issued in Athens, Thessaloniki and Larissa. Fire danger has increased significantly as very hot and dry conditions increase wildfires significantly.
Large parts of Europe are being scorched by temperatures above 40ºC due to a heat wave that has been named "Cerberus", after the three-headed dog in ancient Greek mythology who guarded the gates of the underworld.
Temperatures are forecast to reach 48°C in Italy this week, while Greece, Spain, France, Germany and Poland are already feeling the effects of the heatwave. In the Arctic, a record high temperature of 28.8ºC was measured at Slettnes Fyr on the northern tip of Norway, Norwegian meteorologists said on Thursday.
Cerberus is being tracked by the European Space Agency, which said this heatwave could lead to the "hottest temperatures ever recorded in Europe".
How hot is it in Greece?
According to the Hellenic National Meteorological Service, the heat wave will continue across Greece at least until Monday, July 17. Temperatures in the Thessaly region reached up to 44 degrees Celsius on Friday, the service announced, with a maximum of 43 degrees in Sterea and 42 degrees in Epirus. Temperatures will drop slightly over the weekend, but most of Greece will still stay above 40ºC.
The ancient Acropolis in Athens, one of the world's most famous archaeological sites, was closed for several hours on Friday to protect visitors from the scorching heat.
The weather service predicted top temperatures of 41ºC in Athens by midday, but the temperature on the Acropolis hill overlooking the Greek capital is usually higher due to the altitude and lack of shade.
Hellenic Red Cross workers handed out bottles of water to tourists who formed long lines and cooled down in the shade of olive trees, before the monument was temporarily closed.
In Athens and other cities, working hours have changed to allow people to avoid the midday heat, while air-conditioned areas have been opened to the public.
Why are there heat waves in Europe?
Rebekah Sherwin, expert meteorologist from the Met Office's global forecasting team, said the high temperatures were driven by an established high pressure system sitting in the affected regions.
"Heatwave conditions already occurring across much of southern Europe, northwest Africa and the Middle East are expected to continue into next week.
Peak temperatures - which are around 10 to 15 °C higher than average - could reach between 40 °C in parts of southern Europe and up to 50 °C in parts of northern Africa. Above-average temperatures are also possible in some cases further north across Europe, but these will be shorter-lived and less impactful," Sherwin said.
"The high temperatures are being driven by an established high pressure system that is located across the region, allowing temperatures to rise day by day. Extremely high sea surface temperatures are also occurring across the region, with many parts of the Mediterranean experiencing surface temperatures of up to 25 to 28°C. This will exacerbate the effects of the heat on surrounding land areas, as even in coastal regions overnight temperatures are unlikely to drop much below 20 Celsius," Sherwin said.