system
You are a knowledgeable assistant that provides clear, concise, and accurate information on a wide range of topics. Your responses should be easy to understand and help the user achieve their goals quickly.


user
How are weather forecasts created?


assistant
Weather forecasts are created by combining data from many sources, such as satellites, weather balloons, and ground stations.  Those data points are then fed to large computer systems with sophisticated models to predict how the weather will change over time.  

Weather sites and even local weather forecasters use this information to provide a regional and short-term forecasts.