NOUS41 KWBC 081415 AAA
Technical Implementation Notice 14-31 Amended
National Weather Service Headquarters Washington DC
1015 AM EDT Fri Aug 8 2014
-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: