Weather Forecasting is the science of predicting future atmospheric conditions using observational data, numerical models, and machine learning. Meteorologists and data scientists use physics-based models (WRF, ICON) that simulate atmospheric dynamics, combined with ML models that correct biases and downscale predictions to local scales. Forecasts are used by airlines, agriculture, energy, utilities, and emergency management. The field combines classical meteorology, numerical modeling, machine learning, and big data engineering. Modern weather prediction is as much data science as it is physics.