Tuesday, September 30, 2014

HRRR Model Operational Today!

The High-Resolution Rapid Refresh model, or HRRR, is operational today! HRRR creates a 15 hour forecast every hour, so it's a good product to look at when forecasting short term precipitation. 

You can view HRRR forecasts and other forecast products at mag.ncep.noaa.gov

Looks like we'll have some showers along the Wasatch Front later this evening:

High-Resolution Rapid Refresh (HRRR)


Implementation date/time
September 30, 2014, 14Z

The HRRR is a high-resolution model that is run hourly to 15 hours over a domain that covers an area slightly larger than the contiguous United States.  The HRRR provides forecasts, in high detail, of critical weather events such as severe thunderstorms, flash flooding, and localized bands of heavy winter precipitation.   Since the HRRR is run hourly and assimilates many data sources including radar reflectivity data, the HRRR helps provides critical details to forecasters in rapidly-changing and evolving weather events.   The HRRR will also eventually become part of a high-resolution ensemble system, and it will be used to help create a first guess for the Real-Time Mesoscale Analysis.
Changes being made for this release
Initial implementation of this model
Developed by
NOAA/OAR/Earth Systems Research Laboratory

Runs on
The National Weather Service (NWS) Weather and Climate Operational Supercomputing System (WCOSS)
Community software 
Weather Research and Forecasting (WRF) model - ARW core

Rapid Refresh (RAP) model data and various observational data sources, featuring 15 minute radar reflectivity data.
Output and where to find it 
The HRRR runs hourly and produces output every 15 minutes from 0 to 15 hours.  Gridded output on a 3km CONUS grid and station time series BUFR data are sent to www.ftp.ncep.noaa.gov/data/nccf/com/hrrr/prod/hrrr.*, where * is the year, month and day, and also to NOMADS.  Hourly output on the 2.5km CONUS NDFD grid is available on NOAAPORT.  WMO headers can be found at http://www.nco.ncep.noaa.gov/pmb/changes/hrrr_wmo_headers.shtml .  Imagery from the HRRR is available on the Model Analysis and Guidance (MAG) webpage at mag.ncep.noaa.gov .

Primary users 
NCEP Service Centers, FAA, NWS offices (except those in Alaska and Pacific regions), NOAA labs, various private sector companies including the wind and solar energy sectors, and forecasters - especially those concerned about convective evolution.
In the future 
The next version of the HRRR will have various upgrades including changes to address current warm dry daytime bias in warm season and cold bias in cool season.   It will also feature various WRF updates and enhancements to the assimilation of radar reflectivity and other data.   Plans are to eventually expand the HRRR to cover Alaska

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