HRRR Home Info Page
Current and Forecast Graphics
HRRR Documentation
Operational Configuration:
NCEP HRRR Config Files
GRIB2 Tables
NCEP HRRR 2-D Hourly
NCEP HRRR 2-D Sub-hrly
NCEP HRRR 3-D Native Level
NCEP HRRR 3-D Isobaric Level Experimental Configuration:
HRRR Config Files
HRRR-Alaska Config Files
GRIB2 Tables
HRRR 2-D Hourly
HRRR 2-D Sub-hrly
HRRR 3-D Native Level
HRRR 3-D Isobaric Level
HRRR-TLE 2-D Probability
Other Resources:
HRRR/RAP diagnostic fields
FAQ page
RAP/HRRR forum
RUC GRIB viewer
Rapid Refresh web page
HRRR Status
HRRR Status
HRRR Status (Past 24 hrs)
RAP Status
HRRRE Status
HRRR Convective Probabilities
Interactive (Java)
Other Products
NCEP Model Products (GFS,etc.)
Assim Dev Branch/GSD Staff
Modeling Dev Branch/GSD Staff
HRRRv3/RAPv4 changes Jun17
HRRR Home Page
HRRR-Smoke info
NWS Discs Using HRRR
HRRR ChangeLog
HRRRdev ChangeLog
RTMA_3D ChangeLog
HRRR-TLE ChangeLog
HRRR-Alaska ChangeLog HRRR-Hawaii ChangeLog HRRR Sub-3km Nests ChangeLog
Other Information
NCEP ftp access to HRRR data
NCEP product status
NCEP obs processing
NWS-TOC status
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The High-Resolution Rapid Refresh (HRRR)

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The HRRR is a NOAA real-time 3-km resolution, hourly updated, cloud-resolving, convection-allowing atmospheric model, initialized by 3km grids with 3km radar assimilation. Radar data is assimilated in the HRRR every 15 min over a 1-h period adding further detail to that provided by the hourly data assimilation from the 13km radar-enhanced Rapid Refresh .
    HRRR implementations at NCEP
  • HRRRv1 - 30 Sept 2014
  • HRRRv2 - 23 Aug 2016
  • HRRRv3 - 12 July 2018
  • HRRRv4 - planned for spring 2020

HRRR Colorado Labs Award video - a 2-minute layperson-level description on the HRRR from late 2015 and why it is important. (October 2015)
HRRRv3/RAPv4 description and testing - June 2017 .

    Key features:
  • improved mesoscale environment for convective storms and clouds.
  • Less high precip bias for warm-season and cold-season precipitation
  • Improved 2m temps in winter including over snow cover.
  • Extension to 36h every 6h.
  • Addition of Alaska domain for HRRR

HRRR Ensemble (HRRRE) prediction - documentation as of May 2018

The operational version of the HRRR (currently HRRRv3) was implemented at NCEP 12 July 2018.

The experimental HRRR is run by NOAA/ESRL/GSD as a real-time demonstration of advanced versions of the HRRR, ahead of the NCEP operational version. Experimental versions of the HRRR started to run in 2010 and from October 2014 onward, continuing to run more advanced versions than the NCEP operational version but with slightly lower reliability. Usually yearly upgrades are made at ESRL. HRRRv2 physics description in Benjamin et al. 2016, A North American Hourly Assimilation and Model Forecast Cycle: The Rapid Refresh. Mon. Wea. Rev., 144, 1669-1694.

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