Ensemble Configuration
Ensemble Prediction System COSMO-ME-EPS (Operational since 2014)
The atmospheric short-range ensemble prediction system (COSMO-ME EPS) based on the LETKF analysis and the COSMO model is running operationally at COMET (pre-operational since July 2013). The relevant characteristics of the atmospheric COSMO-ME EPS are:
Convection Permitting Ensemble Prediction System COSMO-IT-EPS (Operational since 2018)
The atmospheric short-range ensemble prediction system (COSMO-IT EPS) based on the high-resolution LETKF analysis and the COSMO model is running operationally at COMET. The relevant characteristics of the atmospheric COSMO-IT EPS are:
The atmospheric short-range ensemble prediction system (COSMO-ME EPS) based on the LETKF analysis and the COSMO model is running operationally at COMET (pre-operational since July 2013). The relevant characteristics of the atmospheric COSMO-ME EPS are:
- Domain and resolution: COSMO model is integrated 20 times on the same domain of the LETKF system.
- IC and BC: initial conditions are derived from the LETKF system; lateral boundaries conditions are from the most recent ECMWF-EPS run.
- Model error: stochastics physics perturbation tendencies.
- Forecast range: 72 hours at 00/12 UTC.
Convection Permitting Ensemble Prediction System COSMO-IT-EPS (Operational since 2018)
The atmospheric short-range ensemble prediction system (COSMO-IT EPS) based on the high-resolution LETKF analysis and the COSMO model is running operationally at COMET. The relevant characteristics of the atmospheric COSMO-IT EPS are:
- Domain and resolution: COSMO model is integrated 20 times over Italy, with 2.2 km resolution and 65 vertical levels.
- IC and BC: initial conditions are derived from the high-resolution LETKF system; lateral boundaries conditions are from the most recent ECMWF-EPS run.
- Model error: stochastics physics perturbation tendencies.
- Forecast range: 48 hours at 00/12 UTC.
| System | COSMO-ME EPS | COSMO-IT EPS |
| Domain Size (grid points) | 779 x 401 | 576 x 701 |
| Hor. Grid Spacing(degree / km) | 0.0625/7 Km | 0.02/2.2 Km |
| Number of members | 20 | 20 |
| Number of layers | 45 | 65 |
| Time step (sec) | 60 | 20 |
| Forecast range (h) | 72 hrs | 48 hrs |
| Initial time of Model Runs (UTC) | 00,12 UTC | 00,12 UTC |
| Lateral Boundary Conditions | most recent ECMWF-EPS | most recent ECMWF-EPS |
| LBC Update Frequency (h) | 3 | 1 |
| Initial state | KENDA-LETKF(7 km) | KENDA-LETKF(2.2 km) |
| Model Perturbation | SPPT | SPPT |
| Hardware | Hybrid CPU/GPU cluster (CPU Intel, GPU NVIDIA) | Hybrid CPU/GPU cluster (CPU Intel, GPU NVIDIA) |
