Roy Jenne
								 21 Apr 1995


	      Information about NMC Analysis and Forecast Models

1. Model documentation on Mosaic, at NMC

       http://sgi62,wwb.noaa.gov:8000

	   . from menu, select global modeling branch
	   . then select forecast model information (about 5 pages with
	     references)
	   . there is also information about the SSI analysis methods

2. Texts on the Reanalysis Project

   a. Kalnay, E., ..., R. Jenne (many authors), 1995:  "The NMC/NCAR
      Reanalysis Project."  Submitted to Bul AMS about Apr 1995.

   b. Kalnay, E. and R. Jenne, 1991:  "Summary of the NMC/NCAR Reanalysis
      Workshop of Apr 1991."  Bul American Meteorology Society, Vol 72,
      1897-1904 (Dec 1991 issue).

3. Other Texts

   a. _______, about 1992:  "Research Highlights of the NMC Development
      Division, 1989-91."  This is an NMC report.

   b. Trenberth, K. and J. Olson, 1988:  "Evaluation of NMC Global Analyses:
      1979-87."  NCAR/TN-299-STR, 82 pp.

4. Model changes at NMC

   A few of the changes at NMC are shown below.  Many improvements have been
   made.  Reanalysis will do a better job with the older data.  NCAR has
   information about the data, the model changes, etc.

   a. 22 Sep 1978:    Started the 9-level global grid point model (tropical
		      winds were bad before this).

   b. May 1980 -      R24, L12 started May 1980; R30 started Aug 1982;
      Mar 1991        R40, L18 started May 1986; T80, L18 started Aug 1987;
		      T126, L18 started 6 Mar 1991.

   c. 25 Jun 1991:    T126, L18 with new SSI analysis methods started.  This
		      was a major change.

   d. 4 Feb 1992:     Full clouds and radiation are done each 3 hours, not
		      just each 12 hours as before.

   Reanalysis:  The production phase of reanalysis started in Jun 1994,
		using T62 with 28 levels.  By Dec 1995 about 13 years
		will be done.