Contents: 1. Advent of Numerical Weather Prediction. 2. Hierarchy of Atmospheric Models. 3. Numerical Methods. 4. Objective Analysis. 5. Parameterization of Physical Processes. 6. Weather Prediction - Lorenz Chaos Theory – Nonlinear Dynamics, Ensemble Prediction. 7. Current Status of NWP in India. The Indian Meteorological Society (IMS), established in 1957, is a non-profit organization whose objectives are the advancement of meteorological and allied sciences, dissemination of the knowledge of such sciences both among the scientific workers and among the public, and their application to various constructive human activities. IMS has its headquarters in New Delhi, and it organizes national and international conferences, lectures and other events through its 30 local chapters. It awards prizes, fellowships, and honorary fellowships. IMS has recently embarked on a programme to publish a series of popular books that would demystify meteorology and its various components for common readers. This is the second book in this series.