The document discusses different sources of rainfall in Pakistan, including monsoon winds, western depressions, convectional currents, relief rainfall, and tropical cyclones. It provides details on each source such as the timing and direction of monsoon winds, the path and rainfall amounts from western depressions, and how convectional currents and relief rainfall occur in different parts of Pakistan. Tropical cyclones are mentioned as occasionally originating in the Arabian Sea but rarely reaching Pakistan's coast.