NOUS41 KWBC 021216

PNSWSH

 

Technical Implementation Notice 12-33

National Weather Service Headquarters Washington DC

815 AM EDT Mon Jul 2 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:  Impact on Downstream Jobs When Cycle of Short Range

          Ensemble Forecast System is Missing:

          Effective August 1 2012

 

On or about Tuesday, August 1, 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. 

 

http://www.nws.noaa.gov/os/notification/tin12-30sref.htm

 

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, so as 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 our users.

 

Listed below are impacts related to missing a SREF cycle,

including effects to downstream products that use SREF input:  

 

1. Dissemination: No SREF products for that cycle will be

disseminated.  This list 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.

 

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 technical Implementation Notices are online at:

 

     http://www.nws.noaa.gov/om/notif.htm

 

$$