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NOUS41 KWBC 041211
PNSWSH

Technical Implementation Notice 15-39
National Weather Service Headquarters Washington DC
812 AM EDT Tue Aug 3, 2015

To:      Subscribers:
         -Family of Services
         -NOAA Weather Wire Service
         -Emergency Managers Weather Information Network
         -NOAAPORT
         Other NWS Partners and NWS Employees

From:    Tim McClung
         Chief Operation Officer
         NWS Office of Science and Technology Integration

Subject: Extra-Tropical Storm Surge (ETSS) model and
         post-processing upgrades:
         Effective September 15, 2015

On Tuesday, September 15, 2015, beginning with the 1200
Universal Coordinated Time (UTC) cycle, the Extra-Tropical Storm
Surge (ETSS) model will be upgraded to

-Use a new Alaska basin which lets water flow through the Bering
Strait
-Include overland calculations of water level inundation based
on surge plus tide for all US coastal areas.

The surge plus tide enhancement is possible because ETSS now has
gridded tides in all computation domains. For the East and Gulf
of Mexico, it uses 37 constituents from ADCIRC`s EC-2014 grid.
For the West Coast and Alaska, it uses 13 constituents from
Oregon State Universitys TPXO Global Tidal model.

The products are available on the following three dissemination
sites.

1. NCEP server (aka NOMADS):

As of September 15, 2015, the updated products will be available
here:
 http://nomads.ncep.noaa.gov/pub/data/nccf/com/etss/prod/

As part of NCEP`s standard 30 day parallel testing, the updated
products are already experimental available here:

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

Several changes will occur as described below.

A) Product name changes

The newer station text format products will now have a name as
follows:

etss.tHHz.stormsurge.RGN.txt

where HH is the cycle hour and RGN is the region (est=East
coast, gom=Gulf of Mx, wst=West coast, ber=New Alaska Basin,
gok=Gulf of AK). Previously the region had used the following
convention: e=East coast, g=Gulf of Mexico, w=West coast, k=Gulf
of Alaska, a=Bering Sea, z=Arctic).

B) New surge plus tide products

The gridded surge plus tide products will be labeled
etss.tHHz.stormtide.con2p5km.grib2 for CONUS and
etss.tHHz.stormtide.ala3km.grib2 for Alaska.

The newer station based text format surge plus tide products
will be labeled etss.tHHz.stormtide.RGN.txt, where HH is the
cycle hour and RGN is the region (est=East coast, gom=Gulf of
Mx, wst=West coast, ber=New Alaska Basin, gok=Gulf of AK).

C) New higher resolution (625 m) products for East coast and
Gulf of Mexico

Surge plus tide guidance on the 625 m NDFD CONUS grid will be
labeled etss.tHHz.stormtide.con625m.grib2 where HH is the cycle
hour.

Tide only guidance on the 625 m NDFD CONUS grid will be labeled
etss.tHHz.tide.con625m.grib2 where HH is the cycle hour.

2. NWS server (aka NDGD):  UNCHANGED

As a reminder, the 2.5 km CONUS (ds.etss-2p5.bin) products will
continue to be available in the National Digital Guidance
Database (NDGD) here:

http://weather.noaa.gov/pub/SL.us008001/ST.expr/DF.gr2/DC.ndgd/G
T.slosh/AR.conus

Similarly, the 3.0 km Alaska (ds.etss-3p0.bin) products will
continue to be available in the NDGD here:

http://weather.noaa.gov/pub/SL.us008001/ST.expr/DF.gr2/DC.ndgd/G
T.slosh/AR.alaska


3. Satellite Broadcast Network

A) Gridded Data  UNCHANGED

As a reminder, the surge only CONUS 5 km and 2.5 km gridded
products as well as the surge only Alaska 6 km and 3 km gridded
products will continue to be available over the SBN.

As a reminder, the 2.5 and 3 km WMO headers are as follows:

     WMO Heading         Region

     MHU... KNHC         NDFD CONUS 2.5 km grid
     MHR... KNHC         NDFD Alaska 3 km grid
     LHU... KNHC         NDFD CONUS 5 km grid (deprecated)
     LHR... KNHC         NDFD Alaska 6 km grid (deprecated)

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 to handle the higher resolution gridded
products (likely fall 2015), NCEp will discontinue the old
products with WMO headings: "LHU... KNHC" and "LHR... KNHC".

B) SHEF Data  REMOVING SRAK70-TIDTWA

NCEP is merging the Arctic SHEF file into the Bering SHEF file
now that the Bering and Arctic basins are a single Bering-
Beaufort-Chukchi basin. The SHEF WMO headers are as follows:

     WMO Heading         Region
     SRUS70 KWNO         CONUS
     SRAK70 KWNO         Alaska

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

In particular, TIDTWA for the Alaskan Arctic Coast is no longer
used as those stations are now in TIDTWB.

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

For questions regarding the data flow aspects, please contact:

     Justin Cooke
     NCEP/NCO Dataflow Team
     College Park, MD
     301-683-0567
     ncep.list.pmb-dataflow@noaa.gov

National echnical Implementation Notices are online at:

   http://www.nws.noaa.gov/om/notif.htm

$$



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