Europe is experiencing a severe heat wave, prompting Italy to issue its highest heat alert for all 27 major cities under its national surveillance system. Temperatures have surpassed 40 degrees Celsius (104 Fahrenheit) in several countries, leading to health warnings for millions and exacerbating drought conditions.

The widespread extreme weather has triggered a cascade of consequences across the continent, including record temperatures in Austria, significant drought impacting energy and shipping in Central Europe, and wildfires from France to the Balkans.

In Austria, the village of Bad Deutsch-Altenburg registered a national record of 41.2 C (106.2 F) on Wednesday. The country is also facing severe drought, with rainfall significantly below average for the year, creating conditions not seen since 1885 in some areas.

Hungary's sole nuclear power plant has reduced output to approximately 10% of normal capacity due to record-low water levels on the Danube River, which it relies on for cooling. This has led the government to implement emergency power conservation measures, including asking industrial users and households to reduce consumption and restricting freight train operations during peak hours.

Germany is confronting challenges with transportation and industry as water levels on the Rhine and other rivers continue to drop. Transport Minister Steffen Bilger has highlighted the significant difficulties posed to inland waterway shipping and the broader logistics chain.

In southeastern France, firefighters are working to contain a wildfire that began on July 20 and has already burned over 60 square kilometers (23 square miles) in the Var region, becoming the largest wildfire recorded there in decades. Authorities caution that the region remains at very high risk for additional fires due to strong winds and extremely dry conditions.

The heat wave has also impacted major tourist sites. In Rome, authorities have extended evening opening hours at landmarks like the Colosseum and Pantheon, installed cooling mist fans, and increased the availability of medical stations.

Scientists and officials emphasize that such extreme weather events are becoming more frequent and intense due to climate warming, forcing governments and businesses to adapt to recurring periods of extreme weather that strain public health systems, power generation, transportation networks, and tourism infrastructure.