Numerical Forecast Systems
NCEP CPPA/GAPP Core Project
(with NWS/OHD and NCEP NAM/NDAS plus
NLDAS Testbed of the Mesoscale NWP Suite)
On April 1, 1995, the National Centers for Environmental Prediction (NCEP) began routine generation of N. America analysis and forecast fields. This new "Early Eta" system became operational on 12Z 12 Oct 1995, and output from this operational system began to populate the CPPA/GAPP tape archive on 00Z 1 Nov 95 (prior to 1 Nov 95 the tape archive was populated by the output from the pre-implementation version of the same model). The output files include A) gridded 3-D and 2-D atmospheric fields of wind velocity, temperature, humidity, and cloud water, as well as a whole host of surface, sub-surface, and near surface fields and B) hourly time series output at a large set of selected sites (about 600) over N. America. On 25 January 2005 the Eta forecast system was renamed to the North American Mesoscale (NAM) forecast system. On June 20, 2006, the Eta model was replaced by the nonhydrostatic WRF-NMM in the NAM suite, and on October 18, 2011, the Non-hydrostatic Multiscale Model on B-grid in NEMS format (NEMS-NMMB) replaces the WRF-NMM as the forecast model in the NAM. After the March 2017 NAM implementation, the NAM was frozen and no more science development will be done, as EMC transitions its operational suite to use the Unified Forecast System based on the FV3 dynamic core.
CPPA/GAPP (formerly GCIP) and GEWEX web sites
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