Rapid Refresh

2014 - Rapid Refresh and HRRR specification of sea- and lake-surface temperature and snow/ice
RAP and HRRR both use the same specification. HRRR SST/LST/snow/ice fields copied from coarser 13km RAP grid (as of July 2014)
    Water-surface temperature (ocean and lakes)
  • Other than lake-surface-temperature exceptions below starting in 2013-14, specified using RTG_SST_HR
  • Lake-surface-temperature exceptions implemented with RAPv2 implementation at NCEP - 25 Feb 2014, or starting late Sept 2013 for ESRL experimental RAP)
    Snow/ice cover
  • Snow geographic cover (and 2-layer snow water equivalent and snow temperature) is cycled in the Rapid Refresh on an ongoing basis, since 2011 at this point. The NESDIS IMS snow cover is used to horizontally trim and build snow cover, as described below.
  • Use NESDIS IMS snow cover
  • Applied to RAP at ~23z each day after new IMS snow data available.
  • Trim snow cover at all points where shown by IMS-snow field
  • Build snow cover (starting in 2013) (snow water equivalent = only 1mm) where needed.

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Prepared by Stan Benjamin stan.benjamin@noaa.gov, 303-497-6387 [an error occurred while processing this directive]