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Numerical Weather Prediction at DWD

Numerical Weather Prediction at DWD. COSMO-EU Grid spacing: 7 km Layers: 40 Forecast range: 78 h at 00 and 12 UTC 48 h at 06 and 18 UTC 1 grid element: 49 km 2 COSMO-DE Grid spacing: 2.8 km Layers: 50 Forecast range: 21 h at 00, 03, 06, 09, 12, 15, 18, 21 UTC

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Numerical Weather Prediction at DWD

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  1. Numerical Weather Prediction at DWD COSMO-EU Grid spacing: 7 km Layers: 40 Forecast range: 78 h at 00 and 12 UTC 48 h at 06 and 18 UTC 1 grid element: 49 km2 COSMO-DE Grid spacing: 2.8 km Layers: 50 Forecast range: 21 h at 00, 03, 06, 09, 12, 15, 18, 21 UTC 1 grid element: 8 km2 Global model GME Grid spacing: 40 km Layers: 40 Forecast range: 174 h at 00 and 12 UTC 48 h at 06 and 18 UTC 1 grid element: 1384 km2

  2. Numerical Weather Prediction at DWD COSMO-DE Configuration • Grid spacing: x = 2.8 km • direct simulation of the coarser parts of deep convection • interactions with fine scale topography • Data assimilation using radar data (LHN) • Time step t = 25 sec • 421 x 461 x 50 grid points~ 1200 * 1300 * 22 km³lowest layer in 10 m above ground • 21-h forecasts from 00, 03, …, 21 UTC • boundary values from COSMO-EU(x = 7 km) • Operational: 16 April 2007

  3. New DWD Headquarters by June 2008 Offenbach, Frankfurter Strasse 135

  4. New DWD Supercomputer by June 2008 • Invitation to tender out in Q2, 2007 • Benchmark: Different resolutions of COSMO model • 3 companies bidding • Final decision will be announced by end of October 2007 • Installation phase I in 2008: 2 x 4.5 TFlop/s sustained • Installation phase II in 2010: Upgrade by at least a factor of 2 • Main cost driver: Ensembles (data assimilation, forecasting)

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