SUMMARY 



such as AtLa 

 herring. T 

 However* the 

 changes in 

 19 76 p re s su r 

 more cLoseL 

 differences, 

 much weaker 

 more intense 

 continental 

 over the Roc 

 in 19 76. 

 subtropi cat 

 Pacific. T 

 coast penetr 

 consequent 

 conditions o 

 that a re a . 



nt i c menhaden* Pacific ma 



he strong westerlies ha 



high level pressure patte 



their annual averages over 



e anomaly patterns at 7CG 



y than those of 1V75* 



The Siberian high latitu 



than in 1974. The subpo 



and covered broader ar 



trough* located over t 



ky Mountains in 1975* was 



The trough indicated a c 



hiah pressure belt extendi 



hat it was over the easter 



ation of Pacific stable hi 



Cali'fornia drought. Tt a 



ve r the eastern seaboard a 



ckerel* and Atlantic sea 

 ve persisted since 1971. 

 rns have undergone drastic 



the Last three years. The 

 mb resemble those of 1974 



but with a few important 

 de high pressure cell was 

 lar lew pressure cells were 

 eas. The r.'orth American 

 he Great Plains in 1974 and 

 over the eastern seaboard 

 ontinental weakening of the 

 ng across the Atlantic and 

 n seaboard indicated a west 

 ah pressure conditions* and 

 Iso indicated more unstable 

 nd greater precipitation in 



The pattern cf seasonal pressure anomalies (differences from 

 30-yr seasonal averages) showed a striking change from summer to 

 fall in 1976. In 1974 and 1975* the annual average anomalies 

 were dominated by the winter anomalies. In 1976* the fall 

 anomalies were so intense that they dominated the annual average. 



Winter 1975-76* with extremely Tiild east coast conditions* nad a 

 zonal distribution of pressure anomalies (the anomalies tended to 

 Line up zonaLiy* or along latitude lines). There was essentially 

 no continental trough* whereas 1974 had a trough over the Great 

 Plains and 197 5 had a deep trough over the Rockies. Py fall 

 1976* the pressure anomalies had become meridional (the anomalies 

 tended to line up along meridians)* indicating extreme wave 

 (nor t h -south ) conditions in the actual pressure distributions. 

 Extreme wave conditions preceded both the winter of 1917-18 and 

 that of 1976-77* the two coldest winters of record in the eastern 

 United States. 



Hayne s 

 during 

 action 

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 ocean 

 pr esen 

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 76. 

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 the a 

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and 

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 78 an 

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 Hayne 

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Timar y 

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atmosph 

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 Haynes * 

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eric 

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 east 

 equ.i 

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c i r cu I 

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Su mma r i 

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discuss 

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of anch 



ation 

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