FOREWORD 



Short-term prediction of environmental factors- is an essential 

 part of the Antisubmarine Warfare Environiriental Prediction System 

 (ASWEPS). The physical processes affecting oceanic environments must 

 he understood before prediction techniques can he formulated. Recog- 

 nizing that observations of diurnal variations in the open ocean are 

 scarce, the Oceanographic Office has conducted a series of observation 

 programs covering a limited area in cooperation with the U. S. Coast 

 Guard. 



This report describes one aspect of the observational resxilts: 

 an analysis of the diurnal processes in the mid-Atlantic during svud- 

 mer. Therefore it serves as a forerunner to a complete understanding 

 of the processes which, in general, govern short-term environmental 

 changes. 



Rear Admira^ U. S. Navy 

 Commander 



iii 



