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Kevin R. Haghi, Bart Geerts, Hristo G. Chipilski, Aaron Johnson, Samuel Degelia, David Imy, David B. Parsons, Rebecca D. Adams-Selin, David D. Turner, and Xuguang Wang

radar tilt and ground clutter on wind measurements in clear air . J. Atmos. Oceanic Technol. , 22 , 649 – 663 , https://doi.org/10.1175/JTECH1737.1 . 10.1175/JTECH1737.1 Maslowe , S. A. , and L. G. Redekopp , 1980 : Long nonlinear waves in stratified shear flows . J. Fluid Mech. , 101 , 321 – 348 , https://doi.org/10.1017/S0022112080001681 . 10.1017/S0022112080001681 Miles , J. W. , 1980 : Solitary waves . Annu. Rev. Fluid Mech. , 12 , 11 – 43 , https://doi.org/10.1146/annurev

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Bart Geerts, David Parsons, Conrad L. Ziegler, Tammy M. Weckwerth, Michael I. Biggerstaff, Richard D. Clark, Michael C. Coniglio, Belay B. Demoz, Richard A. Ferrare, William A. Gallus Jr., Kevin Haghi, John M. Hanesiak, Petra M. Klein, Kevin R. Knupp, Karen Kosiba, Greg M. McFarquhar, James A. Moore, Amin R. Nehrir, Matthew D. Parker, James O. Pinto, Robert M. Rauber, Russ S. Schumacher, David D. Turner, Qing Wang, Xuguang Wang, Zhien Wang, and Joshua Wurman

nocturnal environment that allows convection to become organized and propagate across the plains even as surface-based CAPE vanishes ( Heideman and Fritsch 1988 ; Tripoli and Cotton 1989a , b ). A multistep process is envisioned in which mesoscale convection over this region has its origin over the Rocky Mountains, which act as an elevated heat source. Convectively induced deep-tropospheric gravity waves emerge over the elevated terrain and propagate eastward, triggering nocturnal convective systems

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Tammy M. Weckwerth, John Hanesiak, James W. Wilson, Stanley B. Trier, Samuel K. Degelia, William A. Gallus Jr., Rita D. Roberts, and Xuguang Wang

array of PECAN Integrated Sounding Arrays (PISAs) to sample the vertical profiles of lower-tropospheric winds, temperature, and water vapor. These PISAs and the scanning radars and lidars of PECAN were used to sample the specific features (e.g., LLJ, bores, and gravity waves) and atmospheric regions (e.g., SBL and lower troposphere) relevant to better understanding of NCI. This manuscript brings together past NCI work and PECAN data to document frequencies of different NCI types, as categorized by

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