Rapid Refresh to Replace RUC in Early May 2012

An example composite reflectivity graphic from ESRL
Example RAP output

Rapid Refresh (RAP) is the next-generation hourly-updated replacement for the Rapid Update Cycle (RUC) numerical model covering North America. The National Centers for Environmental Prediction (NCEP), along with the Earth Systems Research Laboratory (ESRL) have been running the RAP model experimentally for some time, and NCEP plans to switch to the RAP for operational use on Tuesday, May 1 2012. (If May 1st is a Critical Weather Day, the transition will take place as soon as practical afterward).

For more information on the RAP model and on the transition plan, see these resources:

 

Rebecca Cosgrove of NWS/NCEP Central Operations in Camp Spring, MD is an NCEP representative to Unidata's Users Committee. She is heavily involved in implementing the RAP model at NCEP, and has generously offered to field questions about the transition from RUC to RAP.

RUC2 grids will be replaced by RAP grids in the IDD CONDUIT and NGRID datastreams at the time that NCEP implements the change. Unidata has been assured that the goal of the RUC2 to RAP transition is to have little to no impact on end-users. This will be accomplished, in part, by keeping the model ID and area coverage the same in replacement RAP products as they are in current RUC2 products. We believe that the transition will be completely transparent for NOAAPort SBN-delivered/IDD-relayed NGRID products. However, the impact of the transition on CONDUIT grids may or may not require end-user modifications to LDM pattern-action file entries.

For additional information on the implications of the transition for CONDUIT users, please read this message from the CONDUIT mailing list.

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