Europe Facing 'Unprecedented' Heatwave: Weatherman Forecasts Blistering Summer To Continue | Know Why

Temperatures in Marseille approach 40C

Madrid's health ministry also warned people to take extra care in the heat, reminding them to stay out of the sun, keep hydrated and pay close attention to those who are older, pregnant or who have chronic health conditions. Two-thirds of Portugal will be on high alert on Sunday for extreme heat and forest fires as temperatures of up to 42C are expected in Lisbon. As temperatures in Marseille approach 40C, authorities in France's second-largest city have ordered public swimming pools to be made free of charge to help residents beat the Mediterranean heat. In Italy, 17 cities -- from Milan in the north to Palermo in the south -- were put on red alert for high temperature, with peaks recorded of 39 degrees Celsius (12 Fahrenheit).

In Rome, the high temperatures drove the Eternal City's many tourists and pilgrims towards its 2,500 public fountains for refreshment. As temperatures in Greece approached 40C, a large wildfire broke out south of Athens on Thursday, leading authorities to issue evacuation orders and shut down parts of the coastal road linking the Greek capital to Sounion, the location of the ancient Temple of Poseidon, a major tourist attraction. Germany is expecting to see its hottest day of the year on Tuesday with temperatures forecast to reach almost 40C.

Heatwave likely to intensify

It is likely to feel a lot hotter than that as high humidity makes it hard to keep cool and adds to the potential discomfort. Even at night, some areas are not expected to drop below 20C bringing what are known as tropical nights. The German Weather Service (DWD) measured the country's highest temperatures this year on Monday at 35.7C in Bad Neuenahr-Ahrweiler in Rhineland-Palatinate. As the heat spreads northeastwards temperatures of 37C are expected in some parts of the country which would yet again break the record.

A heat alert has been issued for most of the country bar parts of the North and Baltic Sea coastlines. Level 2 and level 3 warnings were also issued for parts of Baden-Wurttemberg, particularly the area around Schweighausen and Oberprechtal, northeast of Freiburg. The heatwave follows a series of broken extreme-heat records, including Europe's hottest March ever, according to the EU's Copernicus climate monitor. As a result of the planet's warming, extreme weather events, including hurricanes, droughts, floods and heatwaves, have become more frequent and intense, scientists warn.

Why Europe is facing a scorching heatwave

Europe is facing this heatwave due to trapped, stagnant hot air, thanks to heat domes (a strong, stationary high-pressure system, sometimes called a heat dome) and blocked jet streams, amplified by record-warm oceans and the broader context of climate change. It's part of a concerning pattern of increasingly severe and early-season heat across the continent.

(With inputs from agency)