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  • Hourly data are from national surface stations in China, including hourly observational values of such weather elements as temperature, pressure, relative humidity, moisture pressure, wind and precipitation.
  • 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.
  • The model prediction products for the East Asia region are generated from the operational GRAPES_Meso regional ensemble prediction system. The spatial resolution of the model products is 10km, and the temporal resolution is 3 hours. The time validity of the prediction is up to 72 hours, and predicted elements include pressure, geopotential height, temperature, pseudo-adiabatic potential temperature/pseudo-equivalent potential temperature, dew point deficit (or deficit value), u component of wind, v component of wind, vertical velocity (geometric), relative humidity, precipitation amounts, moisture flux, divergence of moisture flux, etc.. The data files adopt grib2 format, which are disseminated on a daily basis at 00:00 and 12:00 UTC.
  • The data include such observational data as geopotential height, temperature, dew point temperature, wind direction, wind speed at all specific isobaric levels and pressure-temperature-humidity layers from 89 upper air stations in China acquired by the CMA National Meteorological Information Centre (NMIC) through the domestic telecommunication system, and those from foreign upper air stations via GTS.
  • The basic reflectivity products are the basic radar detection values in unit of Dbz, and each pixel of radar imagery represents the total back-scattering energy of cloud-droplet objects within a 1km*1°beam volume.
  • The vertically accumulated liquid water content represents the equivalent liquid water value converted from reflectivity factor, assuming that the reflectivity factor is caused by liquid water in objects, and it is derived from empirical relationship.
  • The data include such observational data as geopotential height, temperature, dew point temperature, wind direction, wind speed of all specific isobaric levels and pressure-temperature-humidity layers at the synoptic hours (00:00 and 12:00 UTC) from the upper air stations in China acquired by the CMA National Meteorological Information Centre (NMIC) through the domestic telecommunication system, and those from foreign upper air stations via GTS.
  • Composite reflectivity factor is a product in which the largest reflectivity factor detected from constant elevation-azimuth scans within a volume scan has been projected onto a Cartesian grid point.
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