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John A. Knox, Donald W. McCann, and Paul D. Williams

occurrence of CAT during a 144-day period using the 20-km output from the 13-km RUC2 operational numerical weather prediction model. Layer TKE dissipation rates calculated from the 1-h forecasts from the 1500 UTC model run (valid at 1600 UTC) for each day from 3 November 2005 to 26 March 2006 are validated with 5546 text pilot reports of turbulence from 1500 to 1700 UTC at or above FL200. PIREPs of turbulence in convection (as determined subjectively from satellite imagery) or in mountain waves (as

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Dong L. Wu and Stephen D. Eckermann

-correlated at 45-km altitude in August 2006 with small-scale GW-induced temperature oscillations explicitly resolved in high-resolution global analysis fields issued by the European Centre for Medium-Range Weather Forecasts (ECMWF) Integrated Forecast System (IFS). Section 6 summarizes major results from this study and briefly discusses areas for future work. 2. The MLS Experiment on Aura The Aura MLS scans the atmospheric limb continuously. Each scan, also called a major frame (MAF), takes 24.7 s

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