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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

     Geoff.Dimego@noaa.gov

or

     Jun Du

     NCEP/EMC

     Camp Springs Maryland 20746

     Phone: 301-763-8000 x 7593

     Jun.Du@noaa.gov

 

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

 

$$