Rapid Refresh (RAP)

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Composite reflectivity

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Surface Temperature

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850 mb Relative Humidity

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850 mb Wind

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250 mb Wind

The Rapid Refresh is the continental-scale NOAA hourly-updated assimilation/modeling system operational at NCEP. RAP covers North America and is comprised primarily of a numerical forecast model and an analysis/assimilation system to initialize that model. RAP is complemented by the higher-resolution 3km High-Resolution Rapid Refresh (HRRR) model, which is also updated hourly and covering a smaller geographic domain. NCEP implementations of 3km HRRR
  • version 1 - 30 Sept 2014
  • version 2 - 23 Aug 2016
  • version 3 - planned for Feb 2018

    Experimental versions of HRRR/RAP implemented at ESRL

    Recent RAP/HRRR presentations

    High-Resolution Rapid Refresh (HRRR - 3km)




    Access to real-time and archive RAP grids
  • NCEP ftp site for real-time RAP data in GRIB2 format
  • NCEP RAP product inventory
  • NWS/COMET archive of RAP hybrid (native) grids
  • NASA ARM archive for RUC/RAP data . Click under "Data User Notes" on switch from RUC to RAP data on 5-1-2012. Data must be requested from the DOE/ARM facility.