NOUS41 KWBC 161925
PNSWSH
Technical
Implementation Notice 12-57
National Weather
Service Headquarters, Washington, DC
225 PM EST Fri
Nov 16 2012
To: Subscribers:
-Family of Services
-NOAA Weather Wire Service
-Emergency Managers Weather
Information Network
-NOAAPORT
Other NWS Partners, Users and
Employees
From: John Derber
Acting Chief, Global Climate and
Weather
Modeling Branch
NCEP/Environmental Modeling Center
Subject: Termination of NCEP’s Legacy Global Data
Assimilation System: Effective
January 08, 2013
Effective
Tuesday, January 8, 2013, with the 1200 Universal
Coordinated Time
(UTC) cycle, the National Centers for
Environmental
Prediction (NCEP) will stop running the legacy
Global Data
Assimilation System (GDAS2) and discontinue all
associated output products. This change does not impact any
output from the existing higher-resolution Global
Data
Assimilation
System (GDAS1).
A Public
Information Statement was issued on September 27, 2012,
requesting comments on the proposed termination of the
GDAS2.
www.nws.noaa.gov/os/notification/pns12gdas2_removal.htm
Based on responses
received, NWS will terminate the GDAS2 and all
associated output products on January 8, 2013.
The GDAS2 are
legacy products with a horizontal resolution of
triangular truncation T62 (about 208 km on 28 sigma
layers),
which is much less than the resolution of the
current Global
Forecast System
(GFS), and the current GDAS1 system. As outlined
in the PNS referenced above, corresponding
products are available
from the higher-resolution GDAS1 for all GDAS2
products to be
discontinued. The GDAS2 products were not created
independently
from the GDAS1 products and were interpolated
fields from the
higher resolution products.
The GDAS2 output
is only disseminated via the NCEP FTP server. No
GDAS2 products
are sent on NOAAPORT. The exact filenames being
removed, along with the corresponding replacement
GDAS1
filenames, are outlined in the PNS referenced above.
If you have
questions about this termination, please contact:
John Derber
NWS/NCEP Environmental Modeling Center
College Park, MD
or
Rebecca Cosgrove
NWS/NCEP Central Operations
College Park, MD
National Public
Information Statements are online at:
http://www.weather.gov/os/notif.htm
$$