Vertical curvature term is added to the horizontal momemtum equation.
Grell scheme is modified to improve water conservation.
A rewritten Reisner II scheme (graupel version). The new scheme is experimental and may subject to futher changes in subsequent releases. (If a user would like to use the older version of the scheme with this release, one can copy the old version of paramr.F and exmoisg.F over the new routines.)
Observational nudging and restart option are added to the MPP MM5.

The detailed changes are described in the CHANGES file in the top directory of the new tar file. The new tar file can be obtained from several locations, including NCAR's MSS and anonymous ftp.

The CHANGES file separates changes into bug fixes/modification (which you definitely want to include in your files), new features and changes (for which you can make a decision as whether you include them in your copy of the code). In addition to this description, the actual changes are provided in a diff file: diff.26SEP98, in directory ReleaseNotes/.

A user should have enough information from these two files to make corresponding changes to your own files.

If you don't want to get a new tar file, files CHANGES, and diff.26SEP98 can be found from anonymous ftp under /mesouser/MM5V2/MM5, and on paiute/ouray/chipeta under
~mesouser/MM5V2/MM5. They are also accessible from the Web site:

http://www2.mmm.ucar.edu/mm5/mm5v2-changes-r2-10.html

*** Note: IF YOU HAVE NOT MADE ANY CHANGES TO YOUR TAR FILE (including file structure and source code), YOU SHOULD GET A NEW TAR FILE.

### Note also that the new Reisner II scheme, exmoisg.F, does not appear in the diff file. It is in the tar file.

If you use NCAR's Cray, the default tar file you get from MSS will be changed to release-2-10 as of the evening of Sep 26 1998.

If you would like to use any previous releases, you can change the MSS read statement in the mm5.deck from

msread mm5v2.tar /MESOUSER/MM5V2/MM5/MM5V2.TAR
to
msread mm5v2.tar /MESOUSER/MM5V2/MM5/MM5V2.TAR.release-2-9

and so on.

If you are an MPP code user, please obtain a new MPP tar file, since some files have been changed. Note that the MPP tar file is now compressed using gzip; therefore the filename on MSS and on NCAR's anonymous ftp is now MPP.TAR.gz.