A weather forecast tells us whether tomorrow will be sunny, rainy, windy or cold. But the atmosphere contains much more than weather. Tiny particles, gases, desert dust and pollen are constantly being emitted, formed, transported and removed. Forecasting where they will be tomorrow requires meteorology and atmospheric chemistry to work together.

A 30% chance of rain sounds simple. But does it mean rain for 30% of the day, rain across 30% of the area, or that meteorologists are only 30% confident? Weather probabilities are familiar, yet they are also among the most misunderstood parts of a forecast.

A weather forecast may indicate 35°C, but that number alone rarely describes how hot the conditions will actually feel. Humidity, sunshine, wind and the surrounding environment all influence how the human body responds to heat. During a heatwave, these factors can create large differences in thermal comfort even between neighbouring locations.

Heatwaves are among Europe's most significant weather hazards, affecting millions of people as well as infrastructure, agriculture, and energy systems. But what actually causes a heatwave? Why do some persist for days or even weeks? And how do meteorologists forecast them?

Weather patterns are often connected across vast distances. A cold winter in Europe or an active Atlantic storm season can sometimes be traced back to oceanic and atmospheric anomalies occurring far beyond the region itself.

The level of detail available in weather forecasts has increased dramatically in recent years. What once focused on broad regional patterns is increasingly moving towards local, street-scale prediction. Modern forecasts can now identify which urban areas will retain heat overnight, where cold air may accumulate, or which locations face the highest risk of intense rainfall and flooding.

Few weather phenomena evolve as rapidly as a thunderstorm. A calm summer afternoon can quickly turn into heavy rain, lightning, hail, and strong winds within less than an hour. What begins as an ordinary cumulus cloud may grow into a towering storm reaching more than 10 kilometres in height. Despite their short lifespan, thunderstorms are among the atmosphere's most dynamic weather systems.

If your spring starts with itchy eyes and a runny nose, the meteoblue air quality tools can give you a fighting chance before you step outside.

During high-impact weather events, different forecast maps often show different outcomes. One model predicts stronger wind gusts, another shifts the peak a few hours later, and a third shows precipitation in a slightly different location. The natural question is: which one should we trust?

Terrain is one of the quiet architects of weather. Even when the larger weather pattern is set by fronts, pressure systems and the jet stream, hills, valleys and mountain ranges can decide where clouds form, where rain falls, where wind accelerates and where cold air lingers long after sunrise.