Poster session numerical weather prediction at meteoswiss
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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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Poster session numerical weather prediction at meteoswiss

Poster Session:Numerical Weather Prediction at MeteoSwiss

Philippe Steiner & Francis Schubiger

MeteoSwiss

SRNWP/EWGLAM meeting, Ljubljana

October 2005


Alpine model almo operational since 2001

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

[email protected]

SRNWP/EWGLAM meeting, 3.-5.10.2005. LJubljana


New almo 2 configuration in test operational in 2008

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

[email protected]

SRNWP/EWGLAM meeting, 3.-5.10.2005. LJubljana

Own assimilation cycle

2 daily 72h forecast

Own assimilation cycle

8 daily 18h forecast


Poster session numerical weather prediction at meteoswiss

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

[email protected]

SRNWP/EWGLAM meeting, 3.-5.10.2005. LJubljana

spectral/temporal

spectral/temporal

white: snow

dark gray: clouds

light gray: snow-free land

black: sea


Poster session numerical weather prediction at meteoswiss

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

[email protected]

SRNWP/EWGLAM meeting, 3.-5.10.2005. LJubljana


Parameterization of topographic effects on radiation

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

[email protected]

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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