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
GSL regional-model forum
Old RAP/HRRR forum (end 2020)
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:
RRFS ChangeLog (table)
RRFS ChangeLog (raw)
HRRR ChangeLog
HRRRE ChangeLog
HRRRdev ChangeLog
RTMA_3D ChangeLog
HRRR-Alaska ChangeLog
HRRR-Hawaii ChangeLog
Sub-3km Nests 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.)
Search GSL

advanced search

The High-Resolution Rapid Refresh (HRRR)

image not available
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 - 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 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.

News items