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