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NOUS41 KWBC 251253

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
         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):

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:

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:

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:

NWS will discontinue the 5 km CONUS product
(grib2.mdlsurgegrid.HHcon) and the 6 km Alaska product

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:

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

NWS Technical Implementation Notices are online at:


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