WRF ARW User's Guide - MMM - UCAR

OBSGRID
• Procedures to input bogus data.
• Expanded Grid: OBSGRID has the capability to cut the input model domain down on
output. This feature allows you to incorporate data from outside your intended grid to
improve analyses near the boundaries. To use this feature, a user must create a larger
domain than the final intended domain when running WPS.
Program Flow
OBSGRID is run directly after metgrid.exe, and uses the met_em* output files from
metgrid.exe as input. OBSGRID also requires additional observations (A) as input. The
format of these observational files is described in the Observations Format section of this
chapter.
Output from the objective analysis programs can be used to:
• Provide fields for Initial and Boundary conditions (1). Note that the files metoa_em* are
formatted identical to the met_em* files from metgrid.exe. The only difference is that the
fields in these files now incorporate observational information.
WRF-ARW V3: User’s Guide 7-2