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Christian Kühnlein, Andreas Dörnbrack, and Martin Weissmann

strong and possibly severe turbulence. However, as already pictured by Förchgott (1949) and impressively shown by Hertenstein and Kuettner (2005) using numerical simulations, a variation of the upstream shear at mountaintop level results in a totally different downslope flow and rotor types. Moreover, observations of downslope flows and rotors revealing the spatial structure in the boundary layer and the temporal evolution were missing. Some ground-based coherent Doppler lidar observations were

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Qingfang Jiang and James D. Doyle

moisture profiles and idealized topography, such as a two-dimensional ridge or an isolated hill. Observation-based studies of realistic synoptic flow past complex terrain are still rare. This study is inspired by observations obtained during the Terrain-induced Rotor Experiment (T-REX; Grubišić et al. 2008 ). Our primary objective is to examine the impact of moisture on mountain waves associated with the interaction between westerly or southwesterly moist airflow and the Sierra Mountains. T-REX took

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