weer

Weer is the state of the atmosphere at a specific place and time. The main variables that describe the weather include temperature, humidity, precipitation, wind speed and direction, cloud cover, and visibility. Other factors such as atmospheric pressure and sunshine also influence how the weather is experienced. Weather results from the uneven distribution of solar energy, air masses moving across the landscape, and moisture exchange with the surface.

Weather is different from climate. Weather refers to short-term conditions and local variability, while climate describes long-term patterns and averages over many years.

Observation and forecasting: Meteorological observations come from weather stations, radar, satellites, and buoys. Forecasts are produced by numerical weather prediction models that combine current observations with physical laws. Short-range forecasts cover hours to days, and longer-range outlooks extend to about a week or more. Forecasts are probabilistic and communicate uncertainty to the public through warnings and advisories.

Common phenomena include changes in temperature, precipitation types (rain, snow, sleet, hail), fog, thunderstorms, wind shifts, and pressure systems such as fronts or high and low pressure. Extreme weather events, including heat waves, heavy rainfall, blizzards, and tropical storms, can pose risks to life and property.

Impact and relevance: Weather affects daily life, agriculture, aviation, shipping, and outdoor activities. People rely on weather services, apps, and media for planning and safety. In maritime climates such as the Netherlands, weather is strongly influenced by proximity to the sea and prevailing westerly winds; national institutes like KNMI monitor and forecast conditions.