Southern European countries braced Friday for a punishing weekend heat wave, with temperatures predicted to hit up to 40 degrees Celsius (104 Fahrenheit) and beyond, prompting health warnings and fears of wildfires.

Wildfires are frequent in Greece during its hot, dry summers. In 2018, a massive fire swept through the seaside town of Mati, east of Athens, trapping people in their homes and on roads as they tried to flee. More than 100 died, including some who drowned trying to swim away from the flames.