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Gregory L. West, W. James Steenburgh, and William Y. Y. Cheng

, approximately 25% of the papers published in American Meteorological Society journals employed reanalyses. Based on the Eta Model Data Assimilation System (EDAS), the North American Regional Reanalysis (NARR) provides analyses covering North America from 1979 to present at 3-h intervals and 32-km grid spacing ( Mesinger et al. 2006 ). It is widely used with over 5000 unique users. Developed to provide a long-term, dynamically consistent dataset for hydrological and meteorological research, one of the

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Vivien Matthias and Marlene Kretschmer

wave reflection for North American cold spells, as well as the possibilities for subseasonal to seasonal (S2S) forecasting has not yet been comprehensively assessed. One reason why reflection events have been given less attention in the past is that (in constrast to the detection of SSWs), no straightfoward index exists to describe them. Wave reflection occurs when a vertically bounded meridional waveguide forms in the high-latitude stratosphere ( Perlwitz and Harnik 2003 ; Shaw et al. 2010

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Lisa M. Hryciw, Eyad H. Atallah, Shawn M. Milrad, and John R. Gyakum

decrease in cattle numbers, increased forest fires, and reduced river and streamflow in Alberta and Saskatchewan, hindering the generation of hydroelectricity in Manitoba and British Columbia ( Bonsal 2008 ; Wheaton et al. 2008 ). The 1999–2005 drought was also notable in its meteorological conditions being distinct from earlier droughts. This drought did not conform to the circulation patterns normally associated with Canadian prairie drought, namely a persistently positive Pacific–North American

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Randy A. Peppler and Peter J. Lamb

1156 MONTHLY WEATHER REVIEW VOLUME 117Tropospheric Static Stability and Central North American Growing Season Rainfall RANDY A. PEPPLER AND PETER J. LAMB*Climate and Meteorology Section. Illinois State Water Survey. Champaign. Illinois(Manuscript received 6 June 1988, in final form 8 November 1988) This study investigates the relation between tropospheric static stability and

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Jeffery C. Rogers

VOL. 104, NO. 8 MONTHLY WEATHER REVIEW AUGUST 1976Sea Surface Temperature Anomalies in the Eastern North Pacific and AssociatedWintertime Atmospheric Fluctuations over North America, 1960-7Y JEI~FERY C. ROGERS2Great Lakes Environmental Research Laboratories, NOAA, Ann Arbor, Mich. 48104 (Manuscript received 23 December 1975, in revised form 21 April 1976) ABSTRACT

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I. Orlanski and J. Sheldon

VOLUME 121 MONTHLY WEATHER REVIEW NOVEMBER 1993A Case of Downstream Baroclinic Development over Western North America I. ORLANSKI AND J. SHELDONGeophysical FluM Dynamics Laboratory/NOAA, Princeton University, Princeton, New Jersey(Manuscript received I March 1993, in final form 19 May 1993) ABSTRACT Numerical simulations have been made of the initiation of a strong ridge

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Ian M. Howard and David W. Stahle

the passage of synoptic-scale storm systems that transport moisture from the Gulf of Mexico northwestward into eastern Colorado. The larger secondary peak in late July can partly be attributed to the Great Plains low-level jet that advects Gulf moisture on the western sector of a persistent ridge that commonly develops in summer over the central United States ( Tang and Reiter 1984 ). The low pressure system related to the North American monsoon system can also funnel moist mid- to upper-level air

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Charles E. Konrad II and Stephen J. Colucci

DECEMBER 1989 CHARLES E. KONRAD II AND STEPHEN J. COLUCCI 2687An Examination of Extreme Cold Air Outbreaks over Eastern North America CHARLES E. KONRAD II AND STEPHEN J. COLUCCIDepartment of Environmental Sciences, University of Virginia, Charlottesville, Virginia(Manuscript received 24 January 1989, in final form 17 June 1989)ABSTRACT The sequence of development and thermodynamic aspects of two strong

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Sarah Strazzo, Dan C. Collins, Andrew Schepen, Q. J. Wang, Emily Becker, and Liwei Jia

models (e.g., Saha et al. 2014 ; Jia et al. 2015 ; MacLachlan et al. 2015 , and others). In particular, multimodel ensembles such as the North American Multimodel Ensemble (NMME; Kirtman et al. 2014 ) tend to produce more skillful and statistically reliable forecasts compared to individual model ensemble systems, likely a result of the cancellation of uncorrelated model errors ( Hagedorn et al. 2005 ). Although dynamical models, particularly multimodel ensembles, yield skillful predictions of

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Lance F. Bosart, Benjamin J. Moore, Jason M. Cordeira, and Heather M. Archambault

1. Introduction During the final ~10 days of October 2007, four high-impact extreme weather events (EWEs) occurred over disparate regions of North America. These EWEs consisted of 1) destructive wind-driven wildfires in California, 2) drought-mitigating widespread heavy rainfall over parts of the eastern United States, 3) anomalously cold conditions associated with two cold surges in Mexico, and 4) exceptionally heavy, flood-producing rainfall in the uplands of the southern Mexican states of

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