A new PBL scheme, based on Eta model's version of Mellor-Yamada scheme, is implemented in this release.
An option for inputting nest terrain during model integration is added. This option allows users to initialize new nest during model integration with higher resolution nest terrain files.
OpenMP parallel directives for shared-memory platforms are added. These directives can be used by any vendor machines who support and conform to OpenMP standard. We encourage users who use shared-memory platforms to test these directives (may require compiler upgrade). It is our hope that these directives will eventually replace those of Cray's, SGI's, and HP's in the current code.
Reisner II scheme (graupel version) is again revised extensively. The scheme should still be considered experimental and may subject to futher changes in later releases.

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.22DEC98, 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.22DEC98 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-r2-11.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 Eta PBL scheme, and the revised Reisner II scheme, exmoisg.F, do 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-2-11 as of the evening of Dec 22 1998, MST. 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-2-10

and so on.

If you are an MPP code user, please obtain a new MPP tar file.