High-Resolution Rapid Refresh (HRRR)

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.

Data and Resources

Additional Info

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Source https://rapidrefresh.noaa.gov/hrrr/
Last Updated October 15, 2021, 16:35 (UTC)
Created September 21, 2021, 18:54 (UTC)