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217 NOUS41 KWBC 251253 PNSWSH Technical Implementation Notice 14-31 National Weather Service Headquarters Washington DC 853 AM EDT Fri Jul 25 2014 To: Subscribers: -Family of Services -NOAA Weather Wire Service -Emergency Managers Weather Information Network -NOAAPORT Other NWS Partners and NWS Employees From: Tim McClung Science Plans Branch Chief Office of Science and Technology Subject: Extra-Tropical Storm Surge (ETSS) enhancements: Effective August 26, 2014 On Tuesday, August 26, 2014, beginning with the 1200 Universal Coordinated Time (UTC) cycle, the Extra-Tropical Storm Surge (ETSS) model will reflect three changes. 1. Use 0.5 degree gridded wind input from the Global Forecast System model instead of 1 degree 2. Use a corrected mask for merging data over the Bering Sea 3. Begin generating 2.5 km National Digital Forecast Database (NDFD) CONUS GRIB2 files and 3 km NDFD Alaska GRIB2 files For the NWS FTP server, the 2.5 km CONUS products will be available in the National Digital Guidance Database (NDGD): http://weather.noaa.gov/pub/SL.us008001/ST.expr/DF.gr2/DC.ndgd/GT .slosh/AR.conus/ds.etss-2p5.bin NWS will discontinue the 5 km CONUS products in that directory: - grib2.mdlsurgegrid.00con - grib2.mdlsurgegrid.06con - grib2.mdlsurgegrid.12con - grib2.mdlsurgegrid.18con The 3 km Alaska products will be available here: http://weather.noaa.gov/pub/SL.us008001/ST.expr/DF.gr2/DC.ndgd/GT .slosh/AR.alaska/ds.etss-3p0.bin NWS will discontinue the 6 km Alaska products: - grib2.mdlsurgegrid.00ala - grib2.mdlsurgegrid.06ala - grib2.mdlsurgegrid.12ala - grib2.mdlsurgegrid.18ala For the NCEP FTP server the new products will be available here: ftp://ftp.ncep.noaa.gov/pub/data/nccf/com/gfs/prod/gfs.YYYYMMDDHH/ where YYYY is the current year, MM is the current month, DD is the current day, and HH is the current hour. They will have names of: grib2.mdlsurgegrid.2.5km.HHcon for CONUS and grib2.mdlsurgegrid.3km.HHala for Alaska. The new products are already available in parallel at: ftp://ftp.ncep.noaa.gov/pub/data/nccf/com/gfs/para/gfs.YYYYMMDDHH/ NWS will discontinue the 5 km CONUS product (grib2.mdlsurgegrid.HHcon) and the 6 km Alaska product (grib2.mdlsurgegrid.HHala). For the Satellite Broadcast Network and NOAAPORT, NWS will provide both the original and new products. The new products will have WMO headers of: WMO Heading Region MHU... KNHC NDFD CONUS 2.5 km grid MHR... KNHC NDFD Alaska 3 km grid The ... in the WMO heading will be replaced by DHH, where D is the day of the forecast. A=Day 0, B=Day 1, ... F=Day 5 and HH is the hour of day when the forecast is valid. A full chart of the header combinations per forecast cycle is available here: http://www.nws.noaa.gov/mdl/etsurge/docs/headers2.xls Once AWIPS is ready, NWS will discontinue the old products with WMO heading of LHU... KNHC and LHR... KNHC. If you have any questions about these changes and additions to the ETSS guidance, please contact: Arthur Taylor & Huiqing Liu Meteorological Development Laboratory Phone: 301-713-1613 X163, 301-713-1613 X162 E-Mail: Arthur.firstname.lastname@example.org, Huiqing.email@example.com NWS Technical Implementation Notices are online at: http://www.nws.noaa.gov/om/notif.htm $$