Rape r 3 



decreased also in the GuLf of Alaska. A strong surface hioh 

 pressure area occupierl the entire EN'P^ bringing strong 

 northwesterly winds from Vancouver Island to central California. 



In the ETP^ east of IZOWx SST's increased at above normal rates 

 north of the equator and increased markedly in the Southern 

 Hemisphere. The SST's were higher here than in any June since 

 '[^I'df a major £1 Nino year. The positive SST anomalies from ION 

 to 1CSr east of ^ZQ^ to the coast and south to below Piscor Perur 

 were larger rhan those of June 1965x an El Nino year. There was 

 a marked reduction of Low stratus/' because of the decreased 

 3ir-sea temperature contrast/ and an increase in cumuliform cloud 

 clusters/ with low barometric pressures/ frequent frontal 

 passages/ and disruption in the southeast trade winds in this 

 area usually dominated by the southeastern Pacific high. 



Tuna fishing off Ecuador decreased sharply as the water 

 temperature rose. In the Northern Hemisphere tuna fishing was 

 very good/ especially on the Albatross Plateau and northwestward 

 after Hurricane Annette moved through early in the month. West 

 of 120w tunc, fishing was better than usual in water slightly 

 warmer than normal with light winds and seas. 



Jyiz ~ Seasonal warming caused SST's to increase over the entire 

 ENP. The warm anomaly pool in the central ENP moved 20 deg 

 southward/ and a small warm patch appeared off Oregon due to 

 decreased northerly winds and less intense upwelling. 



Sea level pres.sures were up to 7 mb lower than normal over the 

 entire ENP. Strong surface pressure gradients caused above 

 normal westerly winds/ resulting in increased evaporative and 

 conductive cooling and vertical mixing. A large area of anomaly 

 >-2C appearea along the 45th parallel and into the Gulf of 

 Alaska. 



Along the equator the SST's showed a tremendous area of anomalous 

 warming/ especially east of 12CW. Normally the temperatures in 

 July decrease 1C or more in this area. Warming appeared in the 

 Peru Current/ typifying an El Nino year. Below normal surface 

 pressures and surface winds south of the equator to 20S and east 

 of 1 1 OW were associated with an unusually weak subtropical high 

 pressure center off South America. Low pressure centers and 

 fronts frequently passed eastward through this area which 

 normally is dominated by high pressure/ weakening the southeast 

 t r ade winds he r e . 



Southwest of Baja California the tuna catch was good 

 warmer than normal. 



in waters 



39 



