NOUS42 KWBC 145808



Public Information Statement, Comment Request

National Weather Service Headquarters, Washington DC

1008 AM EST Wed Feb 1 2012


To:       Subscribers:

          Family of Services

          NOAA Weather Wire Service

          Emergency Managers Weather Information Network


          Other NWS Partners, Users and Employees


From:     Bill Lapenta

          Acting Director, Environmental Modeling Center

          National Centers for Environmental Prediction (NCEP)


Subject:  Soliciting Public Comments on Modification of Product Dissemination Time of Hurricane Weather Research and Forecast (HWRF) System Products through March 9, 2012  


NCEP is proposing to upgrade the Hurricane Weather Research and Forecast (HWRF) modeling system in May 2012. This upgrade would result in HWRF products being distributed to the National Hurricane Center (NHC) and to the public up to 20 minutes later than the current distribution time.  The NWS is seeking comments on this proposed upgrade and resultant distribution schedule change by March 9, 2012.


The proposed upgrades to the HWRF modeling system would be:


- Inclusion of a very high-resolution storm-following third nest

  operating at 3 km horizontal resolution within a 9 km

  intermediate domain and 27 km outer domain

- A centroid-based nest motion algorithm for accurate storm


- Improved vortex initialization applicable for 3 km horizontal

  resolution and upgraded GSI

- Improved PBL, convection and microphysics parameterizations

- Improved synthetic satellite products for GOES and microwave


- A very high temporal resolution tracker product


The benefits to the user community would be improved hurricane track, intensity and structure prediction.


The delayed delivery time would affect all HWRF products distributed through NOAAPORT, the NWS ftp server and the NCEP ftp/http server.      


More details about the HWRF are available at:



At the close of the public comment period, NWS will evaluate the comments to determine whether to proceed with this upgrade to the HWRF as planned. If a decision is made to move forward, a Technical Information Notice will be issued containing the implementation date and more details about the upgrade and resultant product delays.


Please send comments on this proposal to:


Vijay Tallapragada

Hurricane Team Leader

NWS/NCEP Environmental Modeling Center

301-763-8000 x7232


National Public Information Statements are online at: