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Technical Implementation Notice 15-39 Amended

National Weather Service Headquarters Washington DC

1030 AM EDT Tue Oct 20 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

November 3, 2015

Amended to change effective date to November 3, 2015

 

On Tuesday, November 3, 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 University's TPXO Global Tidal model.

The products are available on the following three dissemination

sites.

1. NCEP server (aka NOMADS):

As of November 3, 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/GT.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/GT.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 Technical Implementation Notices are online at:

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

 

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