NOUS41 KWBC 181837 AAC
PNSWSH
Technical Implementation Notice 10-50, Amended
National Weather Service Headquarters
Washington DC
137 PM EST Fri Feb 18 2011
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: Amended: Changes to the
North American Ensemble
Forecasting System (NAEFS): Effective
March 1, 2011
Amended to reschedule
this implementation for March 1, 2011. Also amended to remove the
inclusion of the global ensemble system run by the Fleet Numerical Meteorology
and Oceanography Center in the NAEFS system.
Effective Tuesday, March 1, 2011, beginning
with the 1200 Coordinated Universal Time (UTC) run, the National Centers for
Environmental Prediction (NCEP) will make modifications to the North American
Ensemble Forecasting System (NAEFS). The current NAEFS output is derived
by combining the NCEP Global Ensemble Forecast System (GEFS) and the Canadian
Meteorological Center’s GEFS.
The NAEFS output is disseminated only via
the NCEP server. Products are available for http and ftp download at the
following URLs:
http://www.ftp.ncep.noaa.gov/data/nccf/com/gens/prod/
and
ftp://ftp.ncep.noaa.gov/pub/data/nccf/com/gens/prod/
NCEP will be modifying the output available
from the NCEP GEFS, CMC GEFS and the NAEFS. These modifications include:
Adding the following 13 bias-corrected
elements to the NCEP
GEFS and NAEFS output for all probabilistic
products:
10 hPa(mb) geopotential height
10 hPa(mb) temperature
10 hPa(mb) u component of wind
10 hPa(mb) v component of wind
50 hPa(mb) geopotential height
50 hPa(mb) temperature
50 hPa(mb) u component of wind
50 hPa(mb) v component of wind
100 hPa(mb) geopotential height
100 hPa(mb) temperature
100 hPa(mb) u component of wind
100 hPa(mb) v component of wind
850 hPa(mb) vertical velocity
The directory location of the raw CMC GEFS
data will be changed. Starting on March 1, the GRIB2 output for the
individual member and ensemble means and spreads will be online in the
following directories, where YYYYMMDD is the date and CC is the model cycle:
http://www.ftp.ncep.noaa.gov/data/nccf/com/gens/prod/cmce.YYYYMMDD/CC/pgrb2a
and
ftp://ftp.ncep.noaa.gov/pub/data/nccf/com/gens/prod/cmce.YYYYMMDD/CC/pgrb2a/
In addition, the following 28 variables
will be added to the CMC output:
10 hPa(mb) geopotential height
10 hPa(mb) temperature
10 hPa(mb) relative humidity
10 hPa(mb) u component of wind
10 hPa(mb) v component of wind
50 hPa(mb) geopotential height
50 hPa(mb) temperature
50 hPa(mb) relative humidity
50 hPa(mb) u component of wind
50 hPa(mb) v component of wind
100 hPa(mb) geopotential height
100 hPa(mb) temperature
100 hPa(mb) relative humidity
100 hPa(mb) u component of wind
100 hPa(mb) v component of wind
850 hPa(mb) vertical velocity
Convective inhibition (CIN 180-0 hPa)
Latent heat net flux
Sensible heat net flux
Downward shortwave radiation flux at
surface
Downward longwave radiation flux at surface
Upward shortwave radiation flux at surface
Upward longwave radiation flux at surface
Upward longwave radiation flux at top of atmosphere
Volumetric soil moisture (0-10cm)
Water equivalent of accumulated snow depth
Snow depth (surface)
Soil temperature (0-10cm down)
Data delivery timing is not expected to be
impacted by the implementation. There will only be a minor increase in the data
volumes of existing files due to the addition of new variables.
A sample dataset for this NAEFS
implementation is available at:
ftp://ftp.emc.ncep.noaa.gov/gc_wmb/yzhu/1q2011
Specific information regarding the NAEFS
and scientific implementation is online at:
http://www.emc.ncep.noaa.gov/gmb/yzhu/html/imp/201012_imp.html
By early December, once the model is
running in parallel on the NCEP Central Computing System, a consistent parallel
feed of data will be available on the NCEP server. The parallel data will
be available via the following URLs:
http://www.ftp.ncep.noaa.gov/data/nccf/com/gens/para
and
ftp://ftp.ncep.noaa.gov/pub/data/nccf/com/gens/para
NCEP urges all users to ensure their
decoders can handle changes in content order, changes in the scaling factor
component within the product definition section (PDS) of the GRIB files, and
volume changes. These elements may change with future NCEP model
implementations. NCEP will make every attempt to alert users to these changes
before implementation.
For questions regarding these changes,
please contact:
Yuejian Zhu
NCEP/Global
Modeling Branch
Camp Springs , Maryland
301-763-8000
X 7052
Yuejian.Zhu@noaa.gov
For questions regarding the dataflow
aspects of these datasets, please contact:
Rebecca Cosgrove
NCEP/NCO Dataflow
Team
Camp Springs , Maryland 20746
301-763-8000 X
7198
ncep.pmb.dataflow@noaa.gov
National Technical Implementation Notices
are online at:
http://www.nws.noaa.gov/os/notif.htm
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