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Jeremiah O. Piersante, Kristen L. Rasmussen, Russ S. Schumacher, Angela K. Rowe, and Lynn A. McMurdie

represents the meridional anomaly and arrows show the composite vectors in each figure. Full field composites of 850-hPa wind are also available in Fig. S4 . There are widespread northerly 850-hPa winds on day −2 in both SON and DJF ( Figs. 6a,d ) resulting in northerly moisture flux ( Figs. 7a,d ). As expected based on the relative magnitudes of the low-level lee troughs between the spring and summer ( Figs. 4b and 5b ), the actual ( Fig. S4 ) and anomalous ( Figs. 6a,d ) northerly wind into the La

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Hernán Bechis, Paola Salio, and Juan José Ruiz

mechanisms have been proposed to explain the strength of the low-level moisture gradient leading to the formation of drylines. Frontogenesis caused by shearing deformation and confluence acting over the moisture fields is one of them ( Anthes et al. 1982 ; Ziegler et al. 1995 ). Drylines can also appear as a consequence of inhomogeneities in land cover type or soil conditions. For example, strong differences in soil moisture can lead to horizontal gradients in surface moisture fluxes which can directly

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