Numerical Weather Output

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Brief Description of the Numerical Model Output

The numerical model output is simulated from Weather Research & Forecasting - Environmental Modelling System (WRF-EMS). WRF-EMS is a complete, full-physics, state-of-the-science numerical weather prediction (NWP) package that incorporates dynamical cores from both the National Center for Atmospheric Research (NCAR) Advanced Research WRF (ARW) and the National Center for Environmental Predictions (NCEP) non-hydrostatic mesoscale model (NMM).This model,along with the necessary hardware was set up in Meteorological Forecasting Division (MFD) of Department of Hydrology and Meteorology in July 2015 with the support from Finish Meteorological Institute (FMI) under FNEP2 project.

At MFD, The model is run in the nested mode with horizontal resolution of 12 and 4 km in outer and inner domain respectively. The model is run four times a day using GFS global model data at 00, 06, 12 and 18 UTC as the initial conditions. Both 12 km and 4 km simulations are run for the next three and half days (84 hours) but only high resolution (4 km) forecast for selected variables (precipitation, Temperature, Wind, Wind Gust) are made available from + 12 hr to +84 hr at temporal resolution of 1 hr. This is updated every 6 hours as new forecast becomes available.

Model Configuration

The table below lists the model configuration currently being used at MFD

Model Name: Weather Research and Forest Environmental Modelling System(WRF-EMS)
S.No Parameters Parent Domain Nested Domain
1 Model Domain South Asia Nepal
2 Grid Resolution 12x12 km 4x4 km
3 Time Steps 60 seconds 60 seconds
4 No. of vertical levels 45 45
5 History Interval 60 min 60 min
6 Micro Physics Lin et al Lin et al
7 Cumulus Scheme Kain-Fritsch None
8 Dynamics Non-hydrostatic Non-hydrostatic
9 Topographical data modis_30s+5m modis_30s+2m