HRRR Home Info Page

Current and Forecast Graphics
Real-Time Model Status
Ensemble Status
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 diag fields-NOAA Tech Memo / NOAA-Lib link
Snow/Ice @4km - used in RAP/HRRR
FAQ page
RAP/HRRR forum
RUC GRIB viewer
Rapid Refresh web page
HRRR-CONUS-AK domains map
HRRR Technical Descriptions
HRRR Home Page
HRRR-Smoke info
HRRRv3/RAPv4 changes Jun17
Change Logs:
HRRR ChangeLog
HRRRE ChangeLog
HRRRdev ChangeLog
RTMA_3D ChangeLog
HRRR-Alaska ChangeLog
HRRR-Hawaii ChangeLog
Sub-3km Nests ChangeLog RRFS ChangeLog
AVID Staff
EPAD Staff
Other Information
NWS Discs Using HRRR
NCEP ftp access to HRRR data
NCEP product status
NCEP obs processing
NWS-TOC status
NCEP Model Products (GFS,etc.)
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The High-Resolution Rapid Refresh (HRRR)

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Composite Reflectivity
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 - IMPLEMENTED 12z Wed 2 Dec 2020
    Information here in HRRRv4/RAPv5 summary - Jan 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)
HRRRv4/RAPv5 .

    Key features for HRRRv4:
  • improved cloud representation for boundary-top clouds, especially for shallow cold-air layers with cold-air retention
  • better cloud bands (snow squalls, hurricane bands, lake-effect bands)
  • 3km ensemble data assimilation for improved storm prediction for 1-12h
  • inline smoke prediction
  • improved lake temperatures
  • Extension to 48h forecast every 6h.

HRRR Ensemble (HRRRE) prediction - documentation as of March 2020

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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