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ABSTEIACT 



The summer monsoon blowing from the southwest over the Arabian Sea 

 produces upwelling of very cold water off the coasts of Somalia and Arabia. 

 Aircraft meteorological observations show that a narrow, 25 m sec"-'- jet 

 / exists at about 600 m over the cold wa-ber off Somalia. Analysis of data 

 "^ available at the moment indicates that this jet results from the combina- 

 tion of reduced frictional drag of warm air over cold water and the thermal 

 wind shears produced by the cooling of the lower air by the water. 



