NOUS41 KWBC 081415 AAA



Technical Implementation Notice 14-31 Amended

National Weather Service Headquarters Washington DC

1015 AM EDT Fri Aug 8 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: Amended: Extra-Tropical Storm Surge (ETSS)

         Enhancements: Effective September 23, 2014


Amended to reschedule the ETSS enhancements implementation date

to Tuesday, September 23, 2014


On Tuesday, September 23, 2014, beginning with the 1200 Universal

Coordinated Time (UTC) cycle, the Extra-Tropical Storm Surge

(ETSS) model will use 0.5 degree instead of 1 degree gridded wind

input from the Global Forecast System model. Additionally, ETSS

will use a corrected mask for merging data over the Bering Sea.


Also on Tuesday September 23, 2014, ETSS will 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) here:


The 5 km CONUS products: grib2.mdlsurgegrid.00con,

grib2.mdlsurgegrid.06con, grib2.mdlsurgegrid.12con and

grib2.mdlsurgegrid.18con in that directory will be discontinued.


The 3 km Alaska products will be available here:


The 6 km Alaska products: grib2.mdlsurgegrid.00ala,

grib2.mdlsurgegrid.06ala, grib2.mdlsurgegrid.12ala and

grib2.mdlsurgegrid.18ala in that directory will be discontinued.


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 here:


The 5 km CONUS product (grib2.mdlsurgegrid.HHcon) and the 6 km

Alaska product (grib2.mdlsurgegrid.HHala) will be discontinued.


For the Satellite Broadcast Network and NOAAPORT both the

original and new products will be available.  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.


For questions about these changes and additions to the Extra-

Tropical Storm Surge guidance, please contact:


     Arthur Taylor & Huiqing Liu

     Meteorological Development Laboratory

     Phone: 301-713-1613 X163, 301-713-1613 X162



NWS Technical Implementation Notices are available online: