[conduit] Upcoming SREF upgrade and impact to CONDUIT

I apologize to those of you receiving this notice multiple times due to 
being subscribed to more than one of these lists...

Attention CONDUIT Users:
On August 21, 2012, NCEP will be upgrading the Short-Range Ensemble Forecast
System (SREF).  The full details of the upgrade are available in the NWS 
TIN 12-30, available at
http://www.nws.noaa.gov/os/notification/tin12-30sref_aaa.htm .

Briefly, the models that make up the SREF will be changing.  Currently 
the SREF is comprised of individual Eta, RSM, WRF NMM and WRF ARW 
members.  With the upgrade, the Eta and RSM members will be removed and 
NMMB members will be added.  In addition, the native horizontal 
resolution of all the members will be increased to 16km.

The impact to the CONDUIT data stream will be that on the 21st, the 
individual NMMB members will be added to CONDUIT, and the Eta and RSM 
member output will be removed.  In addition, bias-corrected ensemble 
precipitation fields will be added to CONDUIT.  At this time we do not 
plan to add the new 16km output to CONDUIT, but if there is interest in 
these products, please let us know.

Please also note that, as described in the TIN, the model process id 
number in the GRIB encoding of the WRF NMM and WRF ARW individual member 
products will be changing.  Currently all individual SREF members are 
encoded in GRIB with process number 84.   With this upgrade, the process 
numbers will be 111 for the NMMB, 112 for the WRF NMM, and 116 for the 
WRF ARW.   The process number for the SREF ensemble products will 
continue to be 113 as it is now.

I encourage you to read through the TIN for all the changes coming with 
this upgrade.  Also, please note that due to the increased compute 
resources required to run this upgraded SREF, in the event that the NCEP 
production suite is delayed, the SREF may not be run for a given cycle 
to preserve the timeliness of other NCEP models.  This is a temporary 
situation until we move to our new supercomputers in mid-2013.  More 
details on this potential for cancellation of the SREF and the 
downstream impacts are described in TIN 12-33, available at 
http://www.nws.noaa.gov/os/notification/tin12-33srefdowstreamimpact_aaa.htm 
.

If you have any questions about this upcoming change to the SREF, please 
don't hesitate to contact me.

Becky Cosgrove
NWS/NCEP Central Operations


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