1. NWP Strategy of DWD
after 2006
GF XY
DWD Feb-19

2. 2005-2006 Global Forcast system GME Resolution has been enhanced
Grid size 40 km
Levels: 40 km
Multi level soil model
Data Assimilation
Assimilation of radiances with 1d-Var end of 2005
3d-Var will replace OI end of 2006
Observation space
flow dependent structure functions
GF XY
DWD Feb-19

3. Layer configuration of the new 7-layer soil model
GF XY
DWD Feb-19

4. 2005-2006 Local Model Version LME
Extension of the model domain (covers Europe, Mediterranean Sea, Black Sea, North Sea, Baltic Sea)
Extension of the forecast range to 3 days
Operation will start on 28 September 2005
40 layers
Multi layer soil model
1d-Var assimilation of satellite observations (COSMO priority pilot project)
use of European wind profilers
GF XY
DWD Feb-19

5. LME: LM Europe Model domain of LME Model Configuration
Grid spacing: ° (~ 7 km)
665 x 657 grid points per layer
40 vertical layers
Timestep: 40 (72) sec
Daily runs at 00, 12, 18 UTC, +78h
Boundary Conditions
Interpolated GME forecasts with
Δ ~ 40 km and 40 layers (hourly)
Hydrostatic pressure at lateral
boundaries
Data Assimilation
Nudging analysis scheme
Variational soil moisture analysis
SST analysis at 00 UTC
Snow depth analysis every 6 hrs
Model domain of LME
GF XY
DWD Feb-19

6. 2005-2006 Local Model LMK (“Kürzestfrist” - very short range forecast)
Grid size 2.8 km
Goal: Simulation of the self organisation of deep convection
Goal: Prediction of severe weather on the mesoscale
Rapid update cycle
8 forecasts per day
18h forecast time
To be interpreted as a lagged average ensemble forecast system
GF XY
DWD Feb-19

7. LMK: x = 2.8 km 421 * 461 Gitterpunkte 50 Schichten t = 30 sec.
Tges = 18 h
GF XY
DWD Feb-19

8. LMK: A new 18-h forecast every three hours00 03 06 09 12 15 18 21 00
(UTC)
GF XY
DWD Feb-19

9.
Computer resources
Extension of factor 10 of the performance in 2008 (request has not been approved by the German Government)
Ensemble Prediction System basing on LME and LMK
GF XY
DWD Feb-19

10. 2007-2010 New unified global and regional forecast model ICON
Global model – limited area model
Triangular grid
Local grid refinement
Compressible, conservation properties (mass, energy,...)
to be used for weather forecasting and climate modelling
joint development with Max-Planck-Institute for Meteorology and Universities
GF XY
DWD Feb-19

11. ICON with a double nest covering Europe and Central Europe
GF XY
DWD Feb-19