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Andreas Dörnbrack, Sonja Gisinger, Michael C. Pitts, Lamont R. Poole, and Marion Maturilli

1. Introduction The “picture of the month” as presented in this short contribution is not a photo of the sky spontaneously shot from a digital camera. The picture as displayed in Fig. 1 is a combination of spaceborne measurements by the Cloud–Aerosol Lidar with Orthogonal Polarization (CALIOP) instrument on board the Cloud–Aerosol Lidar and Infrared Pathfinder Satellite Observations ( CALIPSO ) satellite during one of several Arctic overpasses on 30 December 2015 and a high-resolution short

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Howard B. Bluestein

Grant ATM-8204611 is also acknowledged.Debbie Grubis and Ginger Knight typed this manuscript. REFERENCESBilbro, J., G. Fichtl, D. Fitz~arrald, M. Krause and R. Lee, 1984: Airborne Doppler lidar wind field measurements. Bull..4mer. Meteor. Soc., 65, 348-359.Bluestein, H., 1983: Surface meteorological observations in severe thunderstorms. Part II: Field experiments with TOTO. J. Climate Appl. Meteor., 22, 919-930. , and C. Parks, 1983: A synoptic and photographic climatology of

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Bart Geerts and Qun Miao

encountered by chance in a winter storm over Wyoming. Several previous studies have shown imagery of KH billows (or data supporting the presence of such billows), using flight-level data (e.g., Kropfli 1971 ; Nielsen 1992 ), profiling Doppler radar data (e.g., Browning and Watkins 1970 ; Chilson et al. 2003 ; Luce et al. 2008 ), vertically pointing frequency-modulated continuous-wave radars (e.g., Atlas et al. 1970 ; Gossard 1990 ), profiling cloud lidar data (e.g., Sassen et al. 2007 ), and cloud

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Jacob M. Petre and Johannes Verlinde

the Doppler spread maximum, is consistent with that expected in developing shear instability. We then conclude that these observed features in the velocity and Doppler spread fields indicate shear instability in the interior of the anvil. This shear instability occurs within the cloud; lidar observations confirmed that the visible cloud base was at approximately 6 km, 1 km below the shear instability. Theory suggests that the instability occurs when the layer gradient Richardson number Ri (Δ Z

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