HIRLAM

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HIRLAM Use of the Hirlam NWP Model at Met
Éireann (Irish Meteorological Service) (James
Hamilton -- Met Éireann)
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• COMPUTER SYSTEM and VERSIONS of HIRLAM
• IBM RS/6000 SP 9-nodes each with 4-CPUs
• Operational Hirlam 438x284 grid pts 31-levels
• Nested Hirlam 222x210 grid pts 40-levels
• LINUX PC Twin Xeon Processors 2.0Ghz
• Backup Hirlam 218x144 31-levels
• LINUX PC Twin Xeon Processors 500Mhz
• Hourly Hirlam 97x98 grid pts 24-levels

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• OPERATIONAL HIRLAM IBM RS/6000 SP
• HIRLAM 5.0.1 with 3DVAR
• 3-Hour assimilation cycle with 48-hour forecasts
  every 6-hours
• Rotated lat/long 0.15x0.15 grid with 438x284
  grid points
• Hybrid eta coordinates with 31-levels
• CBR vertical diffusion scheme Sundqvist
  condensation scheme
• STRACO cloud scheme Savijarvi radiation scheme
• Digital filter initialisation
• Two time-level Semi-Lagrangian semi-implicit
  scheme
• Use of frame boundaries from ECMWF

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• BACKUP HIRLAM LINUX-PC Dual 2.0Ghz CPU
• HIRLAM 4.3.5 with OI-Analysis
• 3-Hour assimilation cycle with 48-hour forecasts
  every 6-hours
• Rotated lat/long 0.30x0.30 grid with 218x144
  grid points
• Hybrid eta coordinates with 31-levels
• SAME AREA AS OPERATIONAL HIRLAM

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• NESTED HIRLAM IBM RS/6000 SP
• HIRLAM 6.0.0 with 3DVAR
• 3-Hour assimilation cycle with 24-hour forecasts
  every 6-hours
• Model runs at intermediate hours 03Z, 09Z,
  15Z, 21Z
• Rotated lat/long 0.12x0.12 grid with 222x210
  grid points
• Hybrid eta coordinates with 40-levels
• Kain-Fritsch/Rasch-Kristjansson
  convection/condensation scheme
• ISBA surface scheme
• Output post-processed with MOS

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• HOURLY HIRLAM ... LINUX-PC Dual 500Mhz CPU
• HIRLAM 4.3 with OI Analysis
• Hourly assimilation cycle with hourly analysis
  and 3-hour forecast
• Rotated lat/long 0.15x0.15 grid with 97x98 grid
  points
• Hybrid eta coordinates with 24-levels
• Analysis shown on public web-site

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• OPERATIONAL USES of HIRLAM
• General Forecasting
• Forecast guidance out to 48-hours
• WAM wave model
• Forecast 10-metre winds used to drive model
• Roadice Prediction System
• Forecast parameters are used as first guess for
  human forecaster
• SATREP
• Overlay on satellite plots ZAMG SATREP analysis
  scheme

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RESEARCH ACTIVITIES Better Specification of
B.C.s for NWP models Operational Implementation
of Nested System Regional Climate Analysis
Modelling Prediction Centre Community Climate
Change Consortium for Ireland RCAMPC and C4I
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• FUTURE PLANS
• Purchase small experimental Linux-Cluster
• Budget of approx Euro 50k
• Use as backup for main computer Operational
  Hirlam
• Gain experience with Linux clusters
• Investigate MOS/Neural-Nets for Post-Processing
• Use Hirlam as input to Point Data-Base

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Thank You