NOUS41 KWBC 311344 AAA

PNSWSH

 

Technical Implementation Notice 14-28

National Weather Service Headquarters Washington DC

240 PM EDT Thu Jul 31 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:   Amended: High-Resolution Rapid Refresh Model Added

           to SBN and NOAAPORT Effective September 23, 2014

 

Amended to change effective date to September 23, 2014

 

Effective Tuesday, September 23, 2014, with the 1400 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 ADEFHKMNOPQSTUVWXYZ/

A1:     GRID CODE /C/

A2:     FORECAST TIME /ONE OF ABCDEFGHIJKLMZ/

II:     LAYER OR LEVEL /ONE OF 00 01 50 70 73 74 85 86 89 92 98

99/

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

 

$$