Cat-III floods are the most severe floods for the rivers Satluj, Ravi, Chenab and Jhelum. Generation of the floods is caused by the approach of an intense tropical depression from the Bay of Bengal. The depression upon reaching the northwest part of Rajasthan comes under the grip of the westerly trough moving eastwards along the northern latitudes of Pakistan. Under this situation, when the 500 mb westerly trough and the tropical depression get mutually juxtaposed along the northsouth axis, the tropical depression tends to intensify and move northwards. Intense rainfall extending over period from 15 – 36 hours occur under the situation resulting in the extremely heavy floods. Timely prediction of this category of floods for the vigilant tracking of tropical depression to the point of its interaction with the westerly. Intensity of the rainfall is dependent upon the intensity of the tropical depression and position of its track in relation to the river catchment. The study can be persued further to formulate a methodology for qualitative forecasting of the catchment rainfall for use in the computational model. Cat-III depression track runs along Lahore, Gujranwala divisions moving further north to the Jhelum and northwards to Rawalpindi division.