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Matthias Grzeschik, Hans-Stefan Bauer, Volker Wulfmeyer, Dirk Engelbart, Ulla Wandinger, Ina Mattis, Dietrich Althausen, Ronny Engelmann, Matthias Tesche, and Andrea Riede

systems, a network of water vapor Raman lidar systems was installed at a number of locations in Germany, the United Kingdom, and Italy. This network consisted of 13 Raman lidar systems plus two water vapor DIAL systems in order to get insight into the usefulness of lidar data assimilation for operational NWP forecasts. The part of the LAUNCH network, which is important for this study, is depicted in Fig. 1 . Three Raman lidar systems were located in Lindenberg (52.21°N, 14.12°E), Ziegendorf (53.31°N

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Ulrich Löhnert, S. Crewell, O. Krasnov, E. O’Connor, and H. Russchenberg

of the BL is essential in state-of-the-art numerical weather forecast models for correctly modeling convection, clouds, and regional precipitation events. An evaluation of the performance of such models in the BL is thus of extreme importance and cannot be carried out using twice-daily operational radiosonde data as demonstrated above. A combination of instruments as used by the IPT may prove very valuable when comparing long-term time series of thermodynamic profiles with model output from NWP

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Daniela Nowak, Dominique Ruffieux, Judith L. Agnew, and Laurent Vuilleumier

1. Introduction Precise forecasting of the formation, evolution, and erosion of fog and low stratus is a major challenge for meteorology, especially in complex topography. One of the goals of the COST 720 Temperature, Humidity, and Cloud (TUC) winter experiment undertaken in Switzerland in 2003/04 ( Ruffieux et al. 2006 ) was to provide a dataset for determining the base and top of low clouds using a simple combination of ground-based remote sensing instruments. Frequent and detailed

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