◎ T639 model products of global medium range weather prediction system

T639L60 global medium range NWP model products have higher resolutions, its global horizontal resolution reaches 30 km, its vertical resolution is 60 layers, and its model top reaches 0.1 hPa. The maximum time validity of prediction is up to 240 hours, and the predicted elements include pressure, geopotential height, temperature, pseudo-adiabatic potential temperature/pseudo-equivalent potential temperature, dew point temperature, dew point deficit (or deficit value), u component of wind, v component of wind, vertical velocity (pressure), relative vorticity, relative divergence, specific humidity, relative humidity, evaporation amount, snow depth, water runoff, snowmelt amount, precipitation amounts, divergence of water vapor flux, water vapor flux, vertical component of moist potential vorticity, horizontal component of moist potential vorticity, liquid content of surface water storage pool, temperature advection, vorticity advection, etc. The data files adopt grib2 format, which are disseminated on a daily basis at 00:00 and 12:00 UTC.

  • Name
  • T639 model products of global medium range weather prediction system 
  • Keywords
  • T639, NWP model, Global, pressure, precipitation, geopotential height, temperature, wind, vorticity, divergence, specific humidity, relative humidity, dew point temperature 
  • Area Scope
  • Global 
  • Making time
  • real time 
  • Begin Time
  • 2015/9/29 
  • End Time
  • Current Time 
  • Frequency
  • twice per day 
  • Share Level
  • Real-name Reg. Individual User access 
  • Quality
  • The global medium range NWP model T639L60 has higher resolutions, its horizontal resolution is 30km globally, its vertical resolution is 60 layers, and the model top is up to 0.1 hPa; The model T639 has higher vertical resolution for its boundary layer, which gives more detailed description of processes in the boundary layer, and it is appropriate to support nowcasting. Inter-comparisons in operational practices show that model T639 has improved the accuracy of predicting such basic elements as H, T and P in its pattern fields; its precipitation predictability has been enhanced, especially its skill in predicting heavy precipitation has witnessed noticeable improvement; the model's temporal resolution has been increased; and time validity of its useful predictions has extended as well. The operational use of the model T639's data assimilation and prediction system allows substantive improvement of weather predication skill and accuracy in China. 
  • DataSource
  • Data source: T639 NWP system of CMA Numerical Prediction Centre. 
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