NOUS42 KWBC 251101



Public Information Statement, Comment Request

National Weather Service Headquarters, Washington DC

702 AM EDT Tue Mar 25 2014


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 Comments through April 23, 2014 on Modifying

          Product Dissemination Time of Hurricane Weather

          Research and Forecast (HWRF) System Products


NCEP is proposing to upgrade the Hurricane Weather Research and

Forecast (HWRF) modeling system in May 2014. 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 (and still be able to meet the

NHC deadline of t+6). NWS is seeking comments on this proposed

upgrade and distribution schedule change by April 23, 2014.


The proposed upgrades to the HWRF modeling system would be:

- Increase in vertical resolution from 42 levels to 61 levels and

  raise the model top from 50 hPa to 2 hPa

- Expand the size of intermediate (9km) domain by 20 percent and

  inner most domain (3km) by 10 percent

- Implement high-resolution MPIPOM-TC Ocean Model for Atlantic

  and Eastern Pacific basins

- Implement RRTMG radiation and upgraded Ferrier-Aligo

  Microphysics scheme


The change would improve hurricane track, intensity and structure

prediction for users.


The delayed delivery time would affect all HWRF products

distributed through the NWS ftp server and the NCEP ftp/http



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



National Public Information Statements are online at: