A weather model is a mathematical representation of the atmosphere used to predict future weather conditions. These models use complex equations to simulate how air, water, and energy interact in the atmosphere. Meteorologists input current weather data into these models to generate forecasts for various locations. There are different types of weather models, including global models that cover large areas and regional models that focus on smaller regions. Each model has its strengths and weaknesses, and meteorologists often compare outputs from multiple models to improve the accuracy of their forecasts.