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Meteorological Forecasts

BOLAM and MOLOCH modelsDomini BOLAM

The hydrostatic BOlogna Limited Area Model (BOLAM) that is operational in ISPRA within the Hydro-Meteo-Marine forecasting System (SIMM - Sistema Idro-Meteo-Mare) is a parallel version of the model developed by Bologna branch of the Institute of Athmospheric Sciences and Climate of the Italian National Research Council (ISAC-CNR). Presently, BOLAM is implemented in two different configurations on a SGI-Altix parallel machine and on a 256-core HP cluster, while originally it was implemented on a 128-processor QUADRICS parallel machine by Alenia (the name of that version was QBOLAM).

The two configurations use the three domains reported in the figure, namely the 0.07° domain (solid blue line), the 0.1° domain (dashed red line), and the 0.3° domain (dashed orange line). At the end of 90s, BOLAM was one of the first Italian models able to provide 10-km meteorological forecasts over the entire Mediterranean Basin. BOLAM is then coupled with a wave forecasting system to simulate the sea state over the Mediterranean Sea and sea surge model to forecast tide events in the Northern Adriatic Sea and, in particular, in the Lagoon of Venice.

More recently, a very high resolution (0.0225°) of the non-hydrostatic MOLOCH model covering Italy (see the solid green line in the figure), developed by ISAC-CNR as well, has been added in the SIMM meteorological compoment. 

84-h forecasts (3 days and half) over the Mediterranean Basin, for both surface fields (at hourly time scale) and level fields (at 3-h time scale), modelled by the 0.1° BOLAM are available in the "0.1° BOLAM forecasts over the Mediterranean Basin" session. 132-h forecasts (5 days and half) over the Mediterranean Basin, for several surface and level fields (all at hourly time scale), modelled by the 0.07° BOLAM are available in the "0.07° BOLAM forecasts over the Mediterranean Basin" session, whereas forecasts over Italy provided by MOLOCH are available in the "MOLOCH forecasts over Italy" session.

Time cross-sections of forecast data of mean sea level pressure, hourly precipitation, 2-m temperatur, and 10-m wind for several Italian places are available in the "Meteograms" session. 

BOLAM in the two configurations is initialised on a daily basis by means of analyses and forecasts provided by the 12:00 UTC run from the previous day of the European Centre for Medium-Range Weather Forecasts (ECMWF) Integrated Forecasting System (IFS), while MOLOCH is initialised using 0.07° BOLAM forecasts. Therefore, for each map it is indicated with INIT. the date and time of the ECMWF IFS run used for the inizialization (even for MOLOCH since IFS is the global model presents at the head of the forecasting meteorological chain), with VALID. the forecast validity time, and with T the time (in hours) elapsed from initialization.

A more detailed description of SIMM is available in the "Hydro-Meteo-Marine forecasting System" session or in the several works available in the "Publications and presentations". Additional information, in particular about the meteorological component of the system, can be requested to: simm-pre-meteo@isprambiente.it.