Thermometers from London to Lisbon once again climbed to the high 30s Celsius (95 Fahrenheit) -- higher in parts of Portugal, Spain and Italy -- and forecasters warned the dog days could last till the end of next week.

Emergency workers continued to fight forest fires across parts of Portugal, Spain, France, Italy, Croatia and Montenegro, though officials said most of the blazes were now under control.

The combination of fast-moving wildfires and punishing temperatures has left at least 33 people dead in the past two weeks -- 19 from fires in France and Portugal, and 14 who succumbed to the heat in Spain.

The forest fires have destroyed around 175,000 hectares (430,000 acres) of pinewood and brush across the continent, most of it in Portugal.

Authorities in Switzerland reported that Alpine glaciers were melting in the unaccustomed heat, creating dangerous conditions for climbers and hikers and leading to the closure of some walking routes.

In France state-owned rail operator SNCF shut down part of the line between the eastern towns of Nancy and Belfort after tracks buckled. The metal reached a temperature of 51 degrees Celsius (124 Fahrenheit) on Tuesday, officials said.

And in southern Italy, dense smoke from fresh wildfires forced authorities to close the famous "Amalfitana" scenic coastal route between Sorrento and Amalfi south of Naples for several hours.

Across western Europe suppliers of fans and air-conditioning equipment reported a run on stocks, as wilting householders sought relief from their mounting discomfort.

"There's not a single fan left in Vienna. We're having to get them as fast as possible from Hungary where it's less hot," said Guenther Waschatz, president of the Austrian Association of Electrical Goods Dealers.

Drinks and ice-cream sellers were also enjoying bumper trade, with the chamber of commerce in the Italian city of Milan reporting that the country had spent more than 560 million euros (635 million dollars) extra in June and July on cold nourishment.

In Paris, residents and tourists sought refuge in shops, movie theatres and museums. "People are just coming in for the air-conditioning, they openly admit it," said a salesgirl at the Galeries Lafayette department store.

With the heat aggravating the severe drought already established across several countries, water shortages were reported along the Adriatic coast of Croatia and Montenegro. In Serbia power production was hit because of low water pressure at hydroelectric plants.

Farmers in the western French region of Brittany said that at least 100,000 animals -- mainly poultry -- had died in the heat. Fire brigades have been repeatedly called out to douse chicken-sheds with water in order to keep the temperature down.

Doctors across the continent reissued advice on how to stay cool. In the western French city of Nantes, a man fell into a coma after spending too long in an overheated car, Le Parisien newspaper reported.

In Austria a specialist warned against too much sex in the sultry weather. "Sustained sexual activity during a heatwave significantly heightens the risk of a heart attack," said Norbert Bachl of the Sports Medicine Institute in Vienna. He advised couples to make love at night.

The heatwave was caused by an anticyclone which has anchored itself firmly over the west European land mass, holding off rain-bearing depressions over the Atlantic and funnelling hot air north from Africa.

Though there was no clear evidence putting the blame on global warming and greenhouse gas production, scientists at the World Meteorological Office point out that the world's 10 hottest recorded years have all taken place since 1987.

SPACE.WIRE