Seven sequences of satellite picture of severe cyclonic stores, which developed in the Bay of Bengal have been examined and day to day changes m their intensities have been discussed With reference to the application of Dvorak's technique for the analysis and forecasting of tropical cyclone intensities. Salient features of storm development in Bay of Bengal, as observed in the satellite pictures, have been highlighted. A comparison of this technique has also been II1ade with synoptic inferences.

Hydrometeorological studies on Narmada and Tapti catchments (1969) revealed that when the Bay depressions reach central parts of Madhya Pradesh during the course of their westward movement, the lower reaches of these catchments and the Gujarat coast start receiving heavy rainfall, Attempts have, therefore, been made to find the critical position of the depressions farthest from Gujarat coast, when their influence in accentuating the monsoon rainfall along Gujarat coast is observed.

Satellite meteorological informations in recent years have proved to be a unique tool in aeronautical operations. Although about 12000 stations throughout the world are taking surface synoptic observations several times a day and about 1200 stations upper wind and radiosonde observations twice daily to provide meteorological informations for aeronautical operations, still there are vast data sparse regions over the globe such as big deserts, Inaccessible mountain ranges and oceanic areas. With the launch of first U.S. weather satellite TIROS-l in April 1960, it was possible for the first time to get up-to-date information over the entire globe through visible and infrared imagery. The better quality pictures from polar orbiting satellites received in both visible and infrared channels have been very helpful to an aviation forecaster In recent years over Indian sub-continent. In the present paper, various cloud characteristics associated with potentially hazardous weather phenomena for aviation such as tropical cyclones, jet-streams, squall lines, tornadoes, fogs etc have been discussed with the special emphasis on the safety of the aircraft.

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