As heatwaves become more frequent across Europe, from the sunbaked plains of Andalusia to the Baltic coastlines of Poland, scientists are refining their forecasting methods using a network of ground-based instruments. These tools measure critical variables—temperature, sunlight, rainfall, wind speed, and soil heat—to build a detailed picture of atmospheric conditions.
Building a Data-Driven Forecast
Meteorologists at institutions such as the German Weather Service (Deutscher Wetterdienst) in Offenbach and Météo-France in Toulouse rely on automated weather stations, radiosondes launched from sites like the Hohenpeißenberg Observatory in Bavaria, and satellite data from the European Organisation for the Exploitation of Meteorological Satellites (EUMETSAT). These instruments feed into complex computer models that simulate how heat accumulates and moves across the continent.
Soil heat flux, measured by sensors buried just below the surface, is particularly important. When soils are dry, as they often are during prolonged dry spells in regions like the Po Valley in Italy or the Hungarian Plain, less energy is used for evaporation. That energy instead heats the air, amplifying surface temperatures. This feedback loop can turn a warm day into a dangerous heatwave.
“The interaction between the land surface and the atmosphere is one of the most challenging aspects to model,” explains Dr. Elena García-Herrera, a climatologist at the Universidad Complutense de Madrid. “But it is also one of the most critical for predicting the intensity and duration of heatwaves.”
These forecasts are not just academic. They inform public health warnings, energy grid management, and agricultural planning. In Portugal, for instance, environmentalists have been pushing for climate shelters in cities like Lisbon and Porto as heatwaves intensify. Meanwhile, Eurostar has upgraded its Celestia trains to withstand temperatures up to 55°C, a direct response to the increasing likelihood of extreme heat along its routes through France, Belgium, and the Netherlands.
Predicting the Future of Extreme Weather
Beyond short-term forecasts, the same data streams help scientists project how heatwaves will evolve under climate change. The European Centre for Medium-Range Weather Forecasts (ECMWF) in Reading, UK, runs seasonal and decadal models that suggest southern and central Europe will experience more frequent and intense heat events by mid-century. This has direct implications for energy demand: Europe's cooling energy demand has doubled in six years, driven largely by air conditioning use in countries like Spain, Italy, and Greece.
Researchers also collaborate across borders through initiatives like the Copernicus Climate Change Service (C3S), which provides open-access data on temperature anomalies and drought indices. This data is used by national agencies to issue early warnings and by farmers to adjust planting schedules. In June, heatwaves were linked to over 10,000 excess deaths across Europe, underscoring the life-saving potential of accurate forecasting.
As the climate warms, the demand for precise, localized forecasts will only grow. Scientists in Europe are already working on higher-resolution models that can predict heatwaves at the neighborhood level—a crucial step for cities like Paris, Berlin, and Warsaw, where urban heat islands can push temperatures several degrees higher than surrounding rural areas.
“We are moving from a reactive to a proactive approach,” says Dr. García-Herrera. “The goal is not just to warn people that a heatwave is coming, but to give them the information they need to protect themselves and their communities.”
