This Bulletin, written by Wan-shu Wu, Mark Iredell, Suranjana Saha and Peter Caplan of the Global Modeling Branch, Environmental Modeling Center, NCEP briefly describes small changes in the global analysis/forecast system in the following topics:

New observation errors in SSI analysis
Changes in assimilation of TOVS radiances
Inclusion of several additional data sources
Elimination of spurious "valley snow"
Soil moisture nudging toward climatology
Conservation of dry mass
Model structural changes
Changes in some GRIB output files

National Weather Service
Last Modified: November 14, 1997