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Anthony M. DeAngelis, Hailan Wang, Randal D. Koster, Siegfried D. Schubert, Yehui Chang, and Jelena Marshak

. 2a–d ). The atmospheric ridge was part of a quasi-stationary Rossby wave train ( Hoskins and Ambrizzi 1993 ; Ambrizzi et al. 1995 ), that is, a series of atmospheric troughs and ridges that remained nearly stationary in geographic location but with energy slowly propagating from west to east along the zonal jet stream. The wave train of 2012 developed between Eurasia and the western North Pacific in early to mid-June and propagated eastward to North America over subsequent weeks ( Figs. 2g

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Richard Seager, Jennifer Nakamura, and Mingfang Ting

phase 2 (NLDAS-2): 2. Validation of model-simulated streamflow . J. Geophys. Res. , 117 , D03110 , https://doi.org/10.1029/2011JD016051 . Yang , S. , K. Lau , and K. Kim , 2002 : Variations of the East Asian jet stream and Asian–Pacific–American winter climate anomalies . J. Climate , 15 , 306 – 325 , https://doi.org/10.1175/1520-0442(2002)015<0306:VOTEAJ>2.0.CO;2 . 10.1175/1520-0442(2002)015<0306:VOTEAJ>2.0.CO;2 Zhao , S. , Y. Deng , and R. X. Black , 2018 : An

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Yizhou Zhuang, Amir Erfanian, and Rong Fu

prediction of the U.S. climate becomes especially difficult in summer as the jet stream and the storm track move farther north and the precipitation regime shifts from a dominantly frontal precipitation to a tropical-like convective regime with a more regional and local character and an enhanced influence of land surface conditions (e.g., Myoung and Nielsen-Gammon 2010 ). Over the Great Plains, summer holds the largest share (>40%) of annual precipitation and variability of its rainfall exerts a strong

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