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Robert P. Harnack and John R. Lanzante

Brunswick, NJ 08903 (Manuscript received 27 October 1983, in final form 3 April 1984) North Pacific and North Atlantic SST (sea surface temperature) were used separately and in combinationto specify seasonal-mean North American 700 mb hcight~ One of the goals was to quantify these relationshipsso that the importance of North Atlantic versus North Pacific SST could be assessed. Sea surface temperaturepredictors we, re in the form of EOF (empirical orthogonal function) amplitudes, while the

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Clayton H. Reitan

D~c~4B~. 1974 C L A Y T O N H. R E I T A N 861Frequencies of Cyclones and Cyclogenesis for North America, 1951-1970 CLAYTOIq H. REITANDepartment of Geography, Northern Illinois University, DeKalb, Ill. 60115(Manuscript received 3 June 1974, in revised form 23 September 1974)ABSTRACT The mean frequency of cyclonic events for North America is determined for five months based on the20-year period

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L. AVERY and B. HAURWITZ

February 1964L. Avery and B. Haurwitz79THE SOLAR SEMIDIURNAL PRESSURE WAVE OVER NORTH AMERICA L. AVERY and B. HAURWITZDepartment of Astrophysics and Afmospheric Physics, University of Colorado and High Altitude Observatory, Boulder, Colo.1. INTRODUCTIONThe solw sernidiurnnl pressure wave (denoted in thefollowing by S2) is one of t.he most regular meteorologicalphenoment1. lhrlier work by A. Schmidt [5] and others,and ltlter hrirmonic analyses and geographical represen-tations 1

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Jerome Namias

VOL. 106, NO. 3 MONTHLY WEATHER REVIEW MARCH 1978Multiple Causes of the North American Abnormal Winter 1976-771 JEROME NAMIASScripps Institution of Oceanography, University of California, San Diego, La Jolla 92093(Manuscript received 24 October 1977, in final form 8 December 1977) ABSTRACT The severe 1976-77 winter over eastern North America and the drought in the west are

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S. R. Macpherson, G. Deblonde, J. M. Aparicio, and B. Casati

) model ( Côté et al. 1998 ). The regional system (3DVAR) uses a regional version of GEM (GEM-REG) ( Mailhot et al. 2006 ), which has a global grid with 15-km uniform resolution over North America and lower variable resolution elsewhere. The global system (4DVAR) uses the GEM model with a globally uniform grid (GEM-GLB), with 33-km resolution at 49° latitude ( Bélair et al. 2005 ). The number of vertical levels (58) in the two configurations is the same and the physics schemes are similar ( Table 1

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C. A. MILLS

C. A. Mills 31 3EXTRATERRESTRIAL FACTORS IN THE INITIATION OF NORTH AMERICAN POLAR FRONTS C. A. MILLSEmetitus Professor of Experimental Medicine, University of Cincinnati, Cincinnati, OhioABSTRACT Begun as an effort to better delineate the effects of sunspots on North American polar front initiation, this studysoon uncovered rather remarkable lunar-solar gravitational influences far outweighing the sunspot influences. Dataused in the study included daily sunspot numbers since

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T. P. Barnett

M^Y 1981 T.P. BARNETT 1021Statistical Prediction of North American Air Temperatures from Pacific Predictors T. P. BARNETTScripps Institution of Oceanography, University of California, fan Diego, La Jolla 92095(Manuscript received 21 July 1980, in final form 17 November 1980) ABSTRACT A statistical study suggests that sea surface temperatures (SST

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Jill Williams

898 MONTHLY WEATHER REVIEW Vo~.uai~.106NOTES AND CORRESPONDENCE Spectral Analysis of Seasonal Precipitation Data from North America and Europe JxLL WI~LiA~s International Institute for Applied Systems Analysis, $-hloss Laxenburg, Austria 1,5 October 1977 and 27 February 1978 ABSTRACT Spectral analysis of 64~year t/me series (1897

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Kingtse C. Mo

summer, the MJO is known to modulate the Indian monsoon onset and the Asian Mei-yu development ( Lau and Chan 1986 ). In addition to the MJO, a 10–20-day mode was found in the westward propagating waves associated with the Indian monsoon. Together with the MJO, they determine the monsoon ridge positions and regulate the monsoon wet and dry periods ( Krishnamurti et al. 1985 ). The present paper examines the impact of intraseasonal oscillations on the summer precipitation regimes over North America

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Clemens Spensberger, Joseph Egger, and Thomas Spengler

1. Introduction The North American Cordillera presents a formidable obstacle to synoptic systems moving eastward through the North Pacific storm-track region, leading to a maximum of cyclolysis upstream of the North American west coast, in particular in the Gulf of Alaska, and a distinct minimum in surface cyclone frequency over the Rocky Mountains (e.g., Wernli and Schwierz 2006 , and references therein). Case studies as well as numerical hindcasts suggest that impinging cyclones can split

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