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BOLAM maps
The Meteoclimatic Department of ARPA Sardinia, in collaboration with the Institute of Atmospheric Sciences and Climate of the Italian National Research Council, runs operationally, twice a day, a meteorological Limited Area Model (LAM), called BOLAM.
The first run is obtained through a direct nesting of BOLAM into the 12UTC run of the TCO1279L137 General Circulation Model (GCM) of the European Centre for Medium-Range Weather Forecast (ECMWF). As initial condition the 12h forecast is used with the following setup:

  • Area limits: 24N/61.5N and 33.5W/49.5E
  • Spatial resolution: 0.08 (about 8 km)
  • Vertical sigma levels: 48
  • Forecast range: 72h (3 days) with maps available every 3h
  • Model update: daily around midnight

The second run is obtained nesting BOLAM into the first run output as initial and boundary conditions (available every 1h). The initial condition is now the 6h BOLAM father forecast. The run setup is:

  • Area limits: 32N/48N and 2W/20E
  • Spatial resolution: 0.04 (about 4 km)
  • Vertical sigma levels: 56
  • Forecast range: 48h (2 days) with maps available every 1h
  • Model update: daily around midnight

The X and Y coordinates represent the distances from the origin of the reference system and 1 is roughly equivalent to 60 nautical miles. The plotted coastline is the one used by BOLAM and therefore it has the same resolution as the model.


Euro-Atlantic and Mediterranean area 0.08 (8km)
Run: 09/12/2023 00:00 UTC
Geopotential height, wind at 250 hPa
Geopotential height, wind, relative vorticity at 500 hPa
Geopotential height, wind, relative humidity at 700 hPa
Geopotential height, wind, temperature at 850 hPa
MSLP, temperature at 2m, wind at 10m
MSLP, relative humidity at 2m, wind at 10m
Total cloud cover
Total precipitation (accumulated in 12h)
Convective precipitation (accumulated in 12h)
Snow depth (accumulated in 12h)
Wind at 10m (greater detail on mid-western Mediterranean area)
Mediterranean area around Italy 0.04 (4km)
Run: 09/12/2023 06:00 UTC
MSLP, temperature at 2m, wind at 10m
MSLP, relative humidity at 2m, wind at 10m
Total cloud cover
Total precipitation (accumulated in 3h)
Total precipitation (accumulated in 12h)
Convective precipitation (accumulated in 3h)
Convective precipitation (accumulated in 12h)
Snow depth (accumulated in 12h)
Wind at 10m (greater detail on Sardinia)


Link
documentazione>meteorologia>i modelli matematici per la meteorologia
i nostri servizi>meteorologia>previsioni>Euro-Mediterranean weather forecasts
ECMWF [http://www.ecmwf.int]
ISAC [http://www.isac.cnr.it/~dinamica/]



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