NCEP Modeling Synergy Meeting Highlights: July 30, 2007
This meeting was led my Michael Brennan and attended by Bill Bua, Keith Brill, Ed Danaher, Brent Gordon, Mark Iredell, Mary Hart, and Eric Rogers. UCAR/COMET’s Stephen Jascourt and AFWA’s Maj. Tim Nobis attended by remote conference.
Brent Gordon of NCO briefed the group of the status of several upcoming NCO implementations planned for the rest of FY07. A detailed list of upcoming NCEP model upgrades and implementations can be found here.
received code to run the real time mesoscale analysis (RTMA) over
modified configuration of the Hi-Res window WRF runs have begun a 30-day
subjective evaluation period. Changes
include in increase in horizontal grid spacing to 4 km in the NMM and 5.1 km in
the ARW. Also, the domain configuration
will be changed to cover the CONUS with two domains instead of three, and
upgrading the WRF-NMM and WRF-ARW to the latest versions of the model. The eastern CONUS domain will be run twice
daily, while the western CONUS and
The new unified post-processor for the GFS is in the subjective evaluation period. This new post-processing affects derived quantities, particularly precipitation type, vorticity and vertical velocity. The Master grid is also being changed from a 0.5° lat/lon grid to a 0.3° Gaussian grid, therefore AWIPS grids created from the GFS output will be generated from the Gaussian grid. Operational implementation is scheduled for 25 September.
multiscale wave model, using two-way grid nesting, is scheduled to be
implemented on 18 September, replacing the three regional wave models currently
being run for the Western Atlantic (including the Gulf of Mexico), the Eastern
the SREF, code was received in the last couple of weeks to add bias corrected
output and increase the coverage over
Production is running well, except for intermittent problems with scripting and model code for the HWRF.
2. NOTES FROM EMC
2a. Global Climate and Weather Modeling Branch
Mark Iredell noted that there have been some problems with the computation of vertical velocity at some levels in the new unified GFS post. All other fields look good so far, and they are awaiting feedback from the subjective evaluation period.
A minor data assimilation upgrade for the GSI is scheduled for the 1st quarter of FY08 to accommodate some data format changes. Also, this upgrade will result in a fully-reproducible GSI.
A CFS upgrade is scheduled for the 1st quarter of FY08. This upgrade will use 1-day old initial conditions instead of 7-day old initial conditions for the model run. The upgrade will also add two T126 members to the CFS running out to 60 days to provide more detailed guidance to CPC for their one-month outlooks.
Testing is underway on a major GFS upgrade planned beyond the 1st quarter of FY08, including potential physics upgrades to the GFS.
2b. Mesoscale Modeling Branch
Rogers noted that the pullback of the planned
Future NAM upgrades plan to include an expanded domain to better serve Alaska and Puerto Rico, and potential physics changes including addition of gravity wave drag and the including momentum mixing in the BMJ cumulus parameterization scheme.
analysis changes for the
2c. Global Ensemble Prediction System
Testing is underway on a major GEFS upgrade planned beyond the 1st quarter of FY08, including testing the use of real time re-forecasting to perform improved bias correction.
The SREF upgrade schedule for 9 October 2007 will decrease the grid spacing of all members to 35 km. The planned move to all WRF components in the SREF has been postponed.
2e. Marine Modeling and Analysis Branch (MMAB):
No representative present.
3. Feedback from operational centers
4. The next synergy meeting will be held Monday, 27 August 2007, at noon in EMC Room 209, with remote conference capability.