-------- Original Message --------
871
NOUS41 KWBC 171814
PNSWSH
Technical Implementation Notice 12-49
National Weather Service Headquarters, Washington, DC
213 PM EDT Wed Oct 17 2012
To: Subscribers:
-Family of Services
-NOAA Weather Wire Service
-Emergency Managers Weather Information Network
-NOAAPORT
Other NWS Partners, Users and Employees
From: Timothy McClung
Chief, Science Plans Branch
Office of Science and Technology
Subject: Modifications to NARRE Products:
Effective November 20, 2012
Effective Tuesday, November 20, 2012, with the 1200 Universal
Coordinated Time (UTC) cycle, the National Centers for
Environmental Prediction (NCEP) will modify the output from the
Time-Lagged North American Rapid Refresh Ensemble Forecast System
(NARRE). The following changes will be made:
- The products will be encoded using Version 2 of GRIB Table 2 to
correct the label on the reflectivity grids from upward long wave
radiative flux >30 (ULWRF) to the correct name: reflectivity >
30dBz (REFC).
- The vertical level ID in the GRIB encoding (kpds6) of
accumulated precipitation (APCP) in the probability files will be
set to the correct value of 1. It is currently set to 255.
- An additional variable of a 1 inch (or 25.5 mm) threshold for
the 3hr and 6hr accumulated precipitation probability will be
added to the files based upon users requests.
NARRE products are currently disseminated at the following
locations:
ftp://ftp.ncep.noaa.gov/pub/data/nccf/com/rap/prod/narre.YYYYMMDD
/ensprod
http://www.ftp.ncep.noaa.gov/data/nccf/com/rap/prod/narre.YYYYMMD
D/ensprod
A sample of NARRE datasets with the changes made is online at:
ftp://ftp.emc.ncep.noaa.gov/mmb/bzhou/NARRE/20120726
The Environmental Modeling Center (EMC) Mesoscale Modeling Branch
(MMB) has a publicly available Website that can provide users
more information concerning NCEP regional modeling systems at:
http://www.emc.ncep.noaa.gov/mmb/mesoscale.html
NCEP encourages users to ensure their decoders are flexible and
are able to adequately handle changes in content, parameter
fields changing order, changes in the scaling factor component
within the Product Definition Section/Template of the GRIB files
and any volume changes which may be forthcoming. These elements
may change with future NCEP model implementations. NCEP will
make every attempt to alert users to these changes prior to any
implementations.
For questions regarding the scientific content of the modeling
system please contact:
Geoff Dimego
NCEP/EMC
College Park, Maryland
email: Geoff.dimego@xxxxxxxx
or:
Binbin Zhou
NCEP/EMC
College Park, Maryland
email: binbin.zhou@xxxxxxxx
For questions regarding the dataflow aspects of these data sets
please contact:
NCEP/NCO Dataflow Team
College Park, Maryland
Phone: 301-683-0567
email: ncep.list.pmb-dataflow@xxxxxxxx
National Technical Implementation Notices are online at:
http://www.weather.gov/os/notif.htm
$$
