NOUS41 KWBC 011140 AAA

PNSWSH

 

Technical Implementation Notice 14-28

National Weather Service Headquarters Washington DC

741 AM EDT Tue Jul 1 2014

 

To:        Subscribers:

           -Family of Services

           -NOAA Weather Wire Service

           -Emergency Managers Weather Information Network

           -NOAAPORT

           Other NWS Partners and NWS Employees

 

From:      Timothy McClung

           Chief, Science Plans Branch

           Office of Science and Technology

 

Subject:   High-Resolution Rapid Refresh Model Added to SBN and

           NOAAPORT: Effective September 16, 2014

 

Effective Tuesday, September 16, 2014, with the 1200 Coordinated

Universal Time (UTC) run, the High-Resolution Rapid Refresh

(HRRR) model produced by the National Centers for Environmental

Prediction will be added to the Satellite Broadcast Network (SBN)

and NOAAPORT.

 

The HRRR model is a 3 km, hourly model with explicit convection

that is initialized by the 13 km Rapid Refresh Model. A 1-hour

spin-up forecast is run, introducing temperature tendencies

obtained from assimilating radar data every 15 minutes during the

hour to help initialize ongoing convection. A 3 km Gridpoint

Statistical Interpolation (GSI) analysis is then performed before

the 15-hour model integration.

 

The grid NWS will provide over the SBN and NOAAPORT is the 2.5 km

National Digital Forecast Database grid #184. This grid is not

the expanded 2.5 km grid #187. The data will be provided for the

analysis and each forecast hour out to the end of the model

integration at hour 15. The sub-hourly (15 minute) HRRR output

will not be available over the SBN or NOAAPORT with this initial

release and datasets will only be available in GRIB2 format.

 

The 00-hr GRIB2 files will be available approximately 47 minutes

after the synoptic time and will arrive sequentially with the

final 15-hour files available approximately 83 minutes after the

synoptic time. The per cycle data volume will be approximately

1.9 GB.

 

The WMO Heading for these products will be as follows:

 

T1:     DATA FORMAT OF GRIB2 /Y/

T2:     PARAMETER CODE /ONE OF ACDEFHKMNOPQSTUVWXYZ/

A1:     GRID CODE /C/

A2:     FORECAST TIME /ONE OF ABCDEFGHIJKLMZ/

II:     LAYER OR LEVEL /ONE OF 00 01 73 74 86 98/

CCCC:   KWBY

 

A complete explanation of the WMO headers for all of the products

is available at:

 

http://www.nco.ncep.noaa.gov/pmb/changes/hrrr_wmo_headers.shtml

 

Information on WMO Headers and NCEP GRIB messages is online at:

 

http://www.nco.ncep.noaa.gov/pmb/docs/on388/appendixa.html

 

A complete Technical Implementation Notice with detailed HRRR

implementation information will be sent by the end of July.

 

For questions concerning the HRRR model, contact:

 

  Geoff Manikin

  NCEP/EMC

  College Park, MD 20740

  Phone: (301) 683-3695

  Email: Geoffrey.Manikin@noaa.gov

 

For questions regarding SBN and NOAAPORT activation contact:

 

  Justin Cooke

  NCEP/NCO

  College Park, MD  20740

  Phone: (301) 683-3833

  Email:  Justin.Cooke@noaa.gov

 

National Technical Implementation Notices are online at:

 

  http://www.weather.gov/os/notif.htm

 

$$