After an exceptionally intense late-June heatwave that shattered records and strained healthcare systems across Europe, the continent is now bracing for a second, potentially more dangerous heat dome. Weather models increasingly point to a prolonged spell of extreme heat in early July, with forecasters warning that this event could last significantly longer than the previous one.
Omega Block Forecast to Lock in Extreme Heat
Unlike the first heat dome, which brought intense but relatively short-lived heat, the upcoming system is expected to evolve into an Omega blocking pattern. Named after the Greek letter due to its shape in the upper atmosphere, this stubborn high-pressure configuration can lock weather systems in place for days, trapping hot, dry air over large parts of western and central Europe.
Meteorologists indicate that such a setup could keep temperatures elevated for nearly a week or longer, dramatically increasing heat stress, wildfire danger, and pressure on power infrastructure. Projections from the European Centre for Medium-Range Weather Forecasts (ECMWF) suggest a powerful ridge of high pressure developing between July 7 and July 10.
Dry Soils Amplify Warming Effect
One critical factor amplifying the concern for this second heatwave is the current state of Europe's landscape. The June heatwave has left large parts of western Europe with severely depleted soil moisture. Normally, some of the sun's energy is used to evaporate water from the ground, providing a natural cooling effect. With soils now much drier, far more energy will instead contribute directly to heating the land and the air above it. This means temperatures could rise faster, remain elevated for longer, and potentially push closer to all-time records.
Regions at Risk: Record-Challenging Temperatures Expected
Forecast models currently indicate exceptionally high temperatures across several countries if the heat dome develops as projected:
- Spain and Portugal: Inland regions, particularly Andalusia, could experience temperatures soaring to 44°C to 46°C, threatening existing July temperature records.
- France: Southwestern France is again expected to be a focal point, with temperatures of 43°C to 45°C possible.
- Germany and Benelux Countries: Inland areas may see temperatures between 38°C and 41°C, with urban centers potentially feeling even hotter due to the urban heat island effect.
- Southern England: London and surrounding regions could face temperatures ranging from 34°C to 37°C, well above seasonal averages.
While exact values may shift as forecasts are refined, meteorologists express increasing confidence in another widespread period of extreme heat.
Widespread Concerns: Public Health, Wildfires, and Energy Strain
A prolonged heatwave brings risks far beyond just high temperatures. Extended dry and windy conditions are expected to significantly elevate forest fire danger across Spain, France, and parts of Italy. Rivers, already running low after June's heat, could decline further, impacting agriculture, navigation, and hydropower generation.
Electricity demand is also projected to surge as households and businesses rely more heavily on air conditioning, adding pressure to energy grids already strained by extreme weather events. Public health officials face renewed concerns over heat-related illnesses, especially among older adults, outdoor workers, and individuals with underlying medical conditions. Hospitals in France, for instance, treated over 3,000 patients for heat-related illnesses in a single 24-hour period during the previous heatwave, prompting emergency health measures.
Europe, recognized as one of the world's fastest-warming continents with temperatures increasing at roughly twice the global average, continues to grapple with the realities of climate change, which scientists say is making heatwaves more frequent, longer-lasting, and more intense.