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NOUS42 KWBC 251101 PNSWSH 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 -NOAAPORT 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 resultin HWRF products being distributed to the National Hurricane Center (NHC) and to the public up to 20 minutes later thanthe current distribution time (and still be able to meet the NHC deadline of t+6).NWS is seeking comments on this proposed upgradeand 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 predictionfor users. The delayed delivery time would affect all HWRF products distributedthrough the NWS ftp server and the NCEP ftp/http server. More details about the HWRF are available at: http://www.emc.ncep.noaa.gov/HWRF/ At the close of the public comment period, NWS will evaluate the commentsto 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 implementationdate and more details about the upgrade and resultantproduct delays. Please send comments on this proposal to: Vijay Tallapragada, Hurricane Team Leader NWS/NCEP Environmental Modeling Center 301-683-3672 Vijay.Tallapragada@xxxxxxxx <mailto:Vijay.Tallapragada@xxxxxxxx> National Public Information Statements are online at: http://www.weather.gov/os/notif.htm
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