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the at,mosphere is stable for vertical dis-placements of air. Sat.ellite photographs show that theunique parallel arrangement of small wave clouds iscommon to all major mountain chains throughout theworld. In the Uilited States, lee waves are frequentlyobserved, as in this case, along the northwestern ranges.On June 21, 1968, the 1200 GMT analysis showed a weaksurface High centered in Wyoming with a low pressurearea off the Washingt.on coast. The 500- and 300-mb.analysis showed strong zonal flow

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

the IFS short-term forecast and the spaceborne observations, which indicates a significant trend that the finer resolution and increasing realism of operational NWP model outputs offers a valuable quantitative source for mesoscale flow components, which were hitherto not accessible globally ( Bauer et al. 2015 ). Acknowledgments Part of this research was funded by the German research initiative “Role of the Middle Atmosphere in Climate (ROMIC)” funded by the German Ministry of Research and

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Bryce J. Weinand

dissipating in extreme eastern Texas and western Louisiana at 1500 UTC on 18 April 1999. This article describes the atmospheric conditions at the time of the eddies and identifies factors that may have contributed to their formation. 2. Synoptic conditions During the days of 17 and 18 April 1999 there was a highly amplified circulation pattern over North America. A large, positively tilted trough evident on the 400-mb map for 1200 UTC 17 April 1999 ( Fig. 4 ) extended well into the middle sections of the

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