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Poster Session: Numerical Weather Prediction at MeteoSwiss

Poster Session: Numerical Weather Prediction at MeteoSwiss. Philippe Steiner & Francis Schubiger MeteoS wiss. SRNWP/EWGLAM meeting, Ljubljana October 2005. IFS/ECMWF, 40km. 4 daily updates. Alpine Model aLMo Operational since 2001. Swiss version of COSMO LM

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Poster Session: Numerical Weather Prediction at MeteoSwiss

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  1. Poster Session:Numerical Weather Prediction at MeteoSwiss Philippe Steiner & Francis Schubiger MeteoSwiss SRNWP/EWGLAM meeting, Ljubljana October 2005

  2. IFS/ECMWF, 40km 4 daily updates Alpine Model aLMoOperational since 2001 • Swiss version of COSMO LM non-hydrostatic, fully compressible • Prognostic variables pressure, 3 wind components, temperature, specific humidity, precipitation (snow, rain), cloud water, cloud ice • regular, 7km mesh size, 45 levels 385 x 325 x 45 gridpoints • 3-hourly assimilation cycle (nudging) • 2 daily 72h forecasts 98% reliability (i.e. 1 problem/month) aLMo domain Philippe.steiner@meteoswiss.ch SRNWP/EWGLAM meeting, 3.-5.10.2005. LJubljana

  3. IFS/ECMWF, 25km, synoptic scale aLMo 7km, regional scale aLMo 2.2km, local scale New aLMo/2 configuration In test, operational in 2008 4 daily updates Philippe.steiner@meteoswiss.ch SRNWP/EWGLAM meeting, 3.-5.10.2005. LJubljana Own assimilation cycle 2 daily 72h forecast Own assimilation cycle 8 daily 18h forecast

  4. 1 image: 10-3-2004, 10:57 UTC Snow cover map based on Meteosat 8 Eumetsat fellowship • Improved spectral + new temporal classification snow map at 5-6 km resolution 24-hour period: 9-3-2004 12:00 UTC - 10-3-2004 12:00 UTC Philippe.steiner@meteoswiss.ch SRNWP/EWGLAM meeting, 3.-5.10.2005. LJubljana spectral/temporal spectral/temporal white : snow dark gray : clouds light gray : snow-free land black : sea

  5. Snow cover map based on Meteosat 8 Eumetsat fellowship • Use also high resolution visible channel with temporal classification snow map at 1.5-2 km resolution Composite snow map, March 10th, 2004, 07:00 - 12:00 UTC Philippe.steiner@meteoswiss.ch SRNWP/EWGLAM meeting, 3.-5.10.2005. LJubljana

  6. 7 km 2.2 km Parameterization of topographic effects on radiation Analysis of slope effect on radiation fluxes at the earth’s surface • slope aspect, slope angle or slope inclination, sky view, shadowing Example: Surface temperature difference, 2004-12-11 00 UTC +12 Philippe.steiner@meteoswiss.ch SRNWP/EWGLAM meeting, 3.-5.10.2005. LJubljana • Substantial impact at high resolution • Higher impact during winter time (sun elevation, snow conditions) • Secondary effects on cloud cover and thermal circulation induced

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