NOUS41 KWBC 311510
AAA
PNSWSH
Technical
Implementation Notice 12-33 Amended
National Weather
Service Headquarters Washington DC
1110 AN EDT Tue
Jul 31 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: Amended Date: Impact on Downstream Jobs When
a Cycle
of Short
Range Ensemble Forecast System Is Missing
Effective August 21, 2012
Amended to
reschedule the implementation to Tuesday, August 21, 2012,
to allow for additional testing of the upgrade
to the Short Range
Ensemble Forecast
System (NWS TIN 12-30).
On or about
Tuesday, August 21, 2012, beginning with the 1500
Coordinated
Universal Time (UTC) run, the National Centers for
Environmental
Prediction's (NCEP) Short Range Ensemble Forecast
System (SREF)
will be updated. See NWS TIN 12-30 for specific details
about this SREF upgrade.
Due to the
current high resource usage on the supercomputers run by
NCEP, this
updated SREF system can only be run in its defined time
window. In the event that the NCEP production suite
is delayed for
any reason, the SREF may not be run for a given
cycle to preserve the
timeliness of other NCEP models. In this situation, no SREF output
products will be disseminated and that cycle will not
be rerun at a
later time.
The SREF will remain in this configuration until the
upgrade to the next supercomputers in late
2013. We apologize for
any inconvenience this causes.
Listed below are
the impacts to customers of missing a SREF cycle,
including effects to downstream products that use the
SREF as input:
1.Dissemination: No SREF products for that cycle will be
disseminated. This includes NOAAPORT, the NWS and NCEP
FTP servers,
the Model Analysis and Guidance (MAG) Webpage
http://mag.ncep.noaa.gov
and the Real-Time NOAA Operational Model Archive
and Distribution
System (NOMADS)
http://nomads.ncep.noaa.gov
2. MDL’s Gridded
LAMP: When SREF data are missing for a
particular
cycle, it will automatically use a previous
cycle’s SREF data as
input.
3. DNG-NAM smartinit: When SREF data are missing for a NAM DNG cycle,
the DNG codes will use the Global Ensemble
Forecast System (GEFS) to
generate the probability of precipitation fields.
4. HREF: When
SREF data are missing for a cycle, it will be treated
as a 2-member (hiresw
NMM and ARW) ensemble.
5. SPC-SREF: If a
SREF cycle is missing Storm Prediction Center (SPC)
post-processing does not activate and SREF-based grids and
products
are not updated until the next available SREF
cycle. This would also
impact the SPC SREF Web page which lists the latest
cycle time from
which output is available:
http://www.spc.noaa.gov/exper/sref/index.php
6. AWC-ECFP: If a
SREF cycle is missing, Aviation Weather Center
(AWC)
post-processing does not activate and the Extended Convective
Forecast Product
(ECFP) will not update until the next available SREF
cycle. The
ECFP Web page shows the last SREF cycle used in the
production of the ECFP available at:
http://www.aviationweather.gov/products/ecfp/
For questions
regarding the scientific content of the modeling system
please contact:
Geoff Dimego
NCEP/EMC
Camp Springs Maryland 20746
Phone: 301-763-8000 x 7221
or
Jun Du
NCEP/EMC
Camp Springs Maryland 20746
Phone: 301-763-8000 x 7593
For questions
regarding the dataflow aspects of these data sets
please contact:
NCEP/NCO Dataflow Team
Camp Springs, Maryland 20746
Phone: 301-763-8000 x 7198
Email: ncep.list.pmb-dataflow@noaa.gov
National NWS
Technical Implementation Notices are online at:
http://www.nws.noaa.gov/om/notif.htm
$$