Skip to main content
U.S. flag

An official website of the United States government

Dot Gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.


The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Examination of The Current and Next Version of The HRRR Model For Some Recent Heavy Precipitation Events


The second-generation operational version of the High Resolution Rapid Refresh (HRRR) model, developed at NOAA/ESRL/GSD and run operationally at NCEP, is scheduled to be updated to its next version in February 2018. The HRRR is the only operational NCEP convection-allowing model with a new run every hour. The HRRR became an operational model at NCEP on 30 September 2014, after being available to forecasters for several years previously on an experimental basis from GSD in Boulder. Currently the HRRR is run once per hour at NCEP out to 18 h at a horizontal grid resolution of 3 km. It is initialized with the RAP (Rapid Refresh model) model, which is run at NCEP at a resolution of 13 km once per hour out to 21 hours, but the HRRR assimilates radar and other data on the 3-km scale. A number of improvements to the RAP (which is scheduled to be updated at NCEP at the same time) and HRRR will be in the next version. This presentation will summarize the changes that will be made for the next operational version of the HRRR. We will then compare the two versions for some recent heavy rain/flash flooding cases in various areas across the CONUS. Examples of output from an experimental HRRR ensemble system will also be shown. In addition, we will look at some neighborhood probability forecasts using the HRRR time-lagged ensemble (HRRRTLE) as potential guidance for heavy rain events.

Article / Publication Data
Available Metadata
Fiscal Year
Published On
January 01, 2018

This publication was presented at the following:

AMS 98th Annual meeting - 2018
American Meteorological Society
Conference presentation


Not available


Authors who have authored or contributed to this publication.

Not available