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CEI Nowcasting tools based on remote sensing data in Croatia and Slovenia

In the framework of two years project called “Central European Initiative (CEI) Nowcasting System” nowcasting tools for operational use based on remote sensing data were developed. This collaboration between Central Institute for Meteorology and Geodynamics in Austria (ZAMG), Meteorological and Hydrological Service of Croatia (MHS), Hungarian Meteorological Service (HMS), Slovak Hydrometeorological Institute (SHMI) and Environmental Agency of the Republic of Slovenia (EARS) was beneficial for all institutes. The way in which the products are implemented at MHS and EARS is presented here. Since the products developed in CEI nowcasting project are the first implementation of nowcasting products in Croatia and Slovenia their high importance was confirmed by meteorologists, hydrologists and especially aviation forecasters. Atmospheric Motion Vectors (AMV) together with the indication of development (calculated as the motion corrected difference between two consecutive images) offers a very good insight into the development and movement of the cloud structures. This has proven to be applicable both for synoptic scale systems, based on satellite imagery, and for smaller scale, based on radar imagery. Additionally, convective cells and their development have been treated with special interest, because of severe weather events they can cause. Therefore a convective cell detection method as well as cell tracking based on satellite imagery have been implemented and successfully used during summer months. In addition to the analysis described above forecasted satellite images up to two hours in advance are produced based on AMVs and last IR image. The level of confidence of such nowcast is depending on the weather situation which forecasters are aware of. Radar motion vector are also produced and forecasted radar images based on them are produced with 10 minutes interval. The outcome of the investigation among forecasters about the usefulness of the nowcasting products is presented as well as the feed-back after a joined training course on the use of the nowcasting products sponsored by EUMETSAT.

nowcast tools; remote sensing

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