FNOUS41 KWBC 011154



Technical Implementation Notice 15-18

National Weather Service Headquarters Washington DC

755 M EDT Wed Apr 1 2015


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) model and

         post-processing upgrades: Effective May 19, 2015


On Tuesday, May 19, 2015, beginning with the 1200 Universal

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

(ETSS) model will be upgraded to include overland calculations

based on surge only for the East Coast and Gulf of Mexico. This

change involves nesting fine-scale tropical basins within the

current larger coarser ETSS basins to take advantage of the

tropical basins' finer overland information and the larger areal

extent of the ETSS basins. Details on these calculations are

online in the following conference papers:






As a result of this upgrade, the ETSS station text products for

the East Coast and Gulf of Mexico and gridded product for CONUS

(covering the East Coast, Gulf of Mexico and West Coast) will be

delivered up to 30 minutes later than they are currently.  Other

ETSS products, including the station text products for the West

Coast and three Alaska regions, and gridded product for Alaska,

will be delivered slightly earlier.


Also on Tuesday, May 19, 2015, ETSS post-processing which

produces bias-corrected total water level guidance will be

included in the NCEP operational system.  This guidance will be

encoded in Standard Hydrological Exchange Format (SHEF) and

provided over the SBN.  Further details on the post-processing

can be found in the following conference paper:




NWS server (FTP or HTTP)


The 2.5 km CONUS (ds.etss-2p5.bin) products will continue to be

available in the National Digital Guidance Database here:






Similarly, the 3.0 km Alaska (ds.etss-3p0.bin) products will

continue to be available in the National Digital Guidance

Database here:






NCEP server (FTP or two HTTP)


Several changes will occur to the NCEP server output, which are

listed below.  An example of these name changes and additional

products changes can be seen here:




1. Products to be removed


To continue the migration to finer ETSS gridded products started

in the fall of 2014, the coarse ETSS gridded products will no

longer be available from the NCEP server.  Specifically the 5 km

CONUS products (grib2.mdlsurgegrid.HHcon for HH=00, 06, 12, and

18) and 6 km Alaska products (grib2.mdlsurgegrid.HHala for HH=00,

06, 12, and 18) will no longer be available.


2. Destination directory is changing


The ETSS products will now be in subfolders of the following

(which will exist on or after May 19, 2015):


- http://www.ftp.ncep.noaa.gov/data/nccf/com/etss/prod/


- http://nomads.ncep.noaa.gov/pub/data/nccf/com/etss/prod/


- ftp://ftp.ncep.noaa.gov/pub/data/nccf/com/etss/prod/


They had been in subfolders of:




Further, the subfolder will be labeled etss.YYYYMMDDHH rather

than gfs.YYYYMMDDHH (where YYYYMMDDHH is respectively the current

year, month, day, and hour).


3. Product name changes


The fine resolution gridded products are being renamed with the

CONUS products labeled etss.tHHz.stormsurge.con2p5km.grib2 and

the Alaska one labeled etss.tHHz.stormsurge.ala3km.grib2, where

HH is the cycle hour. 


4. New products


A new text format for surge only at stations is being provided. 

It has higher precision and more stations than the current text

format and will be labeled etss.tHHz.surge_stations.bsn_R.txt

where HH is the cycle hour and R is the region (e=East coast,

g=Gulf of Mx, w=West coast, a=Bering Sea, z=Arctic, k=Gulf 

of AK).


The new SHEF messages are being provided as a tarball labeled

etss.tHHz.shef_tar, where HH is the cycle hour.


Satellite Broadcast Network and NOAAPORT:


Both the coarse resolution (5 km and 6 km) and higher resolution

(2.5 km and 3 km) gridded ETSS products will be available over

the SNB and NOAAPORT. The higher resolution products 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 (presumably AWIPS II) is ready to handle the higher

resolution gridded products (likely in the fall of 2015), the old

products with WMO heading of LHU... KNHC and LHR... KNHC will be



The new ETSS SHEF-encoded, bias-corrected total water level

guidance will have the following WMO headers:


      WMO Heading       Region


      SRUS70 KWNO       Conus

      SRAK70 KWNO       Alaska


and AWIPS IDs:


      AWIPS ID          Region


      TIDTWE                  US East Coast

      TIDTWG                  Gulf of Mexico

      TIDTWP                  US West Coast

      TIDTWC                  Gulf of Alaska

      TIDTWB                  Alaskan Bering Sea Coast

      TIDTWA                  Alaskan Arctic Coast


If you have any questions about these changes and additions to

the Extra-Tropical Storm Surge guidance, please contact:


     Arthur Taylor

     Meteorological Development Laboratory

     Phone: 301-427-9444

     E-Mail: Arthur.Taylor@noaa.gov


     Huiqing Liu

     Meteorological Development Laboratory

     Phone: 301-427-9464

     E-mail: Huiqing.Liu@noaa.gov


     Ryan Schuster

     Meteorological Development Laboratory

     Phone: 301-427-9492

     E-mail: Ryan.Schuster@noaa.gov


For questions regarding the data flow aspects, please contact:


     Kelly Kempisty

     NCEP/NCO Dataflow Team

     College Park, MD




NWS Technical Implementation Notices are available at: