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Poster Session: Numerical Weather Prediction at MeteoSwiss

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Presentation on theme: "Poster Session: Numerical Weather Prediction at MeteoSwiss"— Presentation transcript:

1 Poster Session: Numerical Weather Prediction at MeteoSwiss
Jean-Marie Bettems & Guy de Morsier, MeteoSwiss SRNWP/EWGLAM meeting, Oslo October 2004

2 The Alpine Model at MeteoSwiss - aLMo
Swiss implementation of COSMO model non-hydrostatic, fully compressible Prognostic variables pressure, 3 wind components, temperature, specific humidity, cloud water, cloud ice soon: turbulent kinetic energy, precipitation (snow, rain) Mesh defined on the right panel horizontal: regular, 7km mesh size vertical: terrain following 45L, 100m thickness up to 2000m, top at 25km Highest point: 3109m SRNWP/EWGLAM meeting, , Oslo

3 The Alpine Model at MeteoSwiss - aLMo
Initial conditions from assimilation cycle based on nudging method currently only in-situ observations used (synop, ship, buoy, temp, amdar) provision for GPS IWV and windprofiler Lateral boundary conditions from IFS/ECMWF global model 3 hourly frames In production since 2001 3-hourly intermittent assimilation cycle two 72h forecasts per day 97% reliability (i.e. 2 problems/month) Performance of a single 72h forecast Run on NEC SX5 at CSCS (Swiss National Supercomputing Center) 28 Gflops sustained on 14 PUs (25% of peak), 60‘ elapsed time 12GB main memory 13GB output data SRNWP/EWGLAM meeting, , Oslo

4 Motivation for higher resolution Forecast of local weather
7 km mesh 2.2 km mesh SRNWP/EWGLAM meeting, , Oslo

5 Planed aLMo/2 configuration (2005-7) Nested in ECMWF and aLMo/7
IFS/ECMWF, 25km, synoptic scale aLMo 7km, regional scale 4 daily updates aLMo 2.2km, local scale SRNWP/EWGLAM meeting, , Oslo Own assimilation cycle 2 daily 72h forecast Own assimilation cycle 8 daily 18h forecast

6 Planed aLMo/2 configuration (2005-7) Scientific developments
MeteoSwiss coordinates and participates in many scientific developments Latent heat nudging with radar data (ETHZ, DFG) Assimilation of GPS derived water vapor (swisstopo, ETHZ) Snow analysis using Meteosat 8 (EUMETSAT, ETHZ) Snow, lake temperature, vegetation analysis using NOAA satellites (Uni Bern) Turbulence in planetary boundary layer (EPFL) Dynamical downscaling of ECMWF EPS with the LM (COSMO, NCCR) SRNWP/EWGLAM meeting, , Oslo Visit our poster for further informations

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