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Maruri M.,Basque Meteorology Agency | Maruri M.,Tecnalia | Maruri M.,University of the Basque Country | Romo J.A.,University of the Basque Country | Gomez L.,University of the Basque Country
Atmospheric Measurement Techniques

It is well known in the scientific community that some remote sensing instruments assume that sample volumes present homogeneous conditions within a defined meteorological profile. At complex topographic sites and under extreme meteorological conditions, this assumption may be fallible depending on the site, and it is more likely to fail in the lower layers of the atmosphere. This piece of work tests the homogeneity of the wind field over a boundary layer wind profiler radar located in complex terrain on the coast under different meteorological conditions. The results reveal the qualitative importance of being aware of deviations in this homogeneity assumption and evaluate its effect on the final product. Patterns of behavior in data have been identified in order to simplify the analysis of the complex signal registered. The quality information obtained from the homogeneity study under different meteorological conditions provides useful indicators for the best alternatives the system can offer to build wind profiles. Finally, the results are also to be considered in order to integrate them in a quality algorithm implemented at the product level. © 2014 Author(s). Source

Lopez J.,Basque Meteorology Agency | Hernaez I.,Basque Meteorology Agency | Montanya J.,University of Barcelona
2012 31st International Conference on Lightning Protection, ICLP 2012

In this work, single-flash thunderstorms are discussed. The term single-flash is used in order to refer thunderstorms that leave very few or even only one lightning flash, usually related to the presence of tall structures. In this work, several cases of single-flash thunderstorms affecting wind farms are considered. The lightning impacts have been detected using different technologies in two separate lightning detection and location networks. Depending on the peak current estimated by the lightning detection sensors, most of the detections can be classified as upward positive leaders initiated by the wind turbines in presence of a thundercloud. Both cold and warm season thunderstorms are considered. A complete characterization of the thunderstorms using data from lightning detections networks and weather radar is provided. © 2012 IEEE. Source

Gaztelumendi S.,Basque Meteorology Agency | Gonzalez M.,Tecnalia | Egana J.,Basque Meteorology Agency | Rubio A.,Tecnalia | And 7 more authors.

In this contribution, the most relevant aspects of the ITSASEUS project are shown. Under this acronym, several works are carried out by the partners (EUVE and AZTI-Tecnalia) in order to implement an operational oceano-meteorological system for providing daily a 72-hour forecast for the Basque Country region and its influence areas. The system combines meteorological, wave and hydrodynamic modelling at several scales together with field observations. The meteorological model used is the MM5 mesoscale model with a nested domains configuration, in which the GFS (Global Forecast System) is used for providing the lateral and initial conditions. The wave and hydrodynamic models used are the Wavewatch-III and ROMS, respectively. Preliminary results are promising and show the forecast subsystems ability to predict oceano-meteorological variables in the Basque Country region. Source

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