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Poster Session: Numerical Weather Prediction at MeteoSwiss

Poster Session: Numerical Weather Prediction at MeteoSwiss. Jean-Marie Bettems & Guy de Morsier , MeteoS wiss. SRNWP/EWGLAM meeting, Oslo October 2004. Highest point: 3109m. The Alpine Model at MeteoSwiss - aLMo. Swiss implementation of COSMO model non-hydrostatic, fully compressible

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Poster Session: Numerical Weather Prediction at MeteoSwiss

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

  2. Highest point: 3109m 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 jean-marie.bettems@meteoswiss.ch SRNWP/EWGLAM meeting, 4-6.10.2004.2004, 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 jean-marie.bettems@meteoswiss.ch SRNWP/EWGLAM meeting, 4-6.10.2004.2004, Oslo

  4. 7 km mesh 2.2 km mesh Motivation for higher resolutionForecast of local weather jean-marie.bettems@meteoswiss.ch SRNWP/EWGLAM meeting, 4-6.10.2004.2004, Oslo

  5. IFS/ECMWF, 25km, synoptic scale aLMo 7km, regional scale aLMo 2.2km, local scale Planed aLMo/2 configuration (2005-7)Nested in ECMWF and aLMo/7 4 daily updates jean-marie.bettems@meteoswiss.ch SRNWP/EWGLAM meeting, 4-6.10.2004.2004, 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) jean-marie.bettems@meteoswiss.ch SRNWP/EWGLAM meeting, 4-6.10.2004.2004, Oslo Visit our poster for further informations

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