March 2001:

   Began to run twice a day.
   Model configuration: 30 km, 28 level, time step 200 sec, CONUS. 
   Physics: Kain-Fritcsh, MRF PBL, 5-layer soil model, 
            Dudhia SW/RRTM LW, NCEP 3-class microphysics.

 May 5, 2001:

   Began to run 10 km, 28 level central US domain, time step 60 sec.
   Physics: KF, MRF PBL, 5-layer soil model,Dudhia SW/RRTM LW, 
            NCEP 3-class microphysics.
   Initialization: 0000 UTC only.

 June 1, 2001:

   Change cumulus scheme in the 30 km CONUS run from Kain-Fritsch
   to Betts-Miller-Janjic.
   
 July 1, 2001:
  
   Change the CONUS domain from 30 km to 22 km. Same physics as in June.
   Time step: 120 sec.

 September 1, 2001:

   Started to run mass model twice a day.
   Model configuration: same as 22 km CONUS.

 November 6, 2001:

   Switch 10 km central US domain run to mass model.
   Physics: KF, MRF PBL, 5-layer soil model, Dudhia SW/RRTM LW, 
            NCEP 5-class microphysics.

 December 1, 2001:

   Switch 22 km height model physics to
   BMJ, Mellor-Yamada-Janjic PBL, OSU LSM, GFDL radation, and
   Eta microphysics.

 January 10, 2002:

   Increase the number of levels in the 10 km domain from 28 to 52.
   Same time step (60 sec) is used.

 February 1, 2002:

   Switch physics in the 22 km height model to
   BMJ, Mellor-Yamada-Janjic PBL, OSU LSM, Dudhia SW/RRTM LW, and
   NCEP 3-class microphysics.

 March 1, 2002:

   Switch physics in the 22 km height model to
   BMJ, MRF PBL, OSU LSM, Dudhia SW/RRTM LW, and
   NCEP 3-class microphysics.

 April 1, 2002:

   Switch physics in the 22 km mass model to
   KF (new), MRF PBL, 5-layer soil model, Dudhia SW/RRTM LW, and
   NCEP 3-class microphysics (ice sedimentation included).

   Begin to run 10 km central US domain twice a day with
   KF (new), MRF PBL, 5-layer soil model, Dudhia SW/RRTM LW, and
   NCEP 5-class microphysics (ice sedimentation included).

   No longer running 22 km height model.

 June 1, 2002:

   Began to run 48 h, 10 km CONUS domain forecast on Jet (NOAA/FSL).
   Physics: KF, MRF, 5-layer soil, NCEP3 microphysics, Dudhia/RRTM radiation. 


 June 7, 2002:

   Switch to use OSU LSM and NCEP 3-class microphysics in the 
   regional 10 km central US domain. Forecast extends to 30 hours. 


 February 1, 2003:

   Switch physics in the 22 km mass model to
   KF (new), YSU PBL, OSU-MM5 LSM, Dudhia SW/RRTM LW, and
   NCEP 3-class microphysics. 

   Start the 22 km CONUS domain run using AVN data, and the same
   physics as in the 22 km CONUS domain run using ETA data. 


 February 20, 2003:

   No longer runs the 10 km Central US domain. 


 May 15, 2003:

   Started to run a 4 km central US domain for BAMEX once a day from 0000 UTC.

   Physics: Lin, YSU PBL, OSU LSM, Dudhia SW, RRTM LW 

   Also started the 10 km Central US domain run. Same physics
   as in the 4 km domain, plus KF convective scheme.

 May 31, 2003:

   Switch 22 km CONUS domain's OSU LSM to Noah LSM. 

   Switch 10 km CONUS domain's microphysics scheme from NCEP3 to Ferrier.

 Oct 1, 2003:

   Update the code to run 10 km CONUS to developmental version.
   Physics: KF, Ferrier, MRF PBL, Noah LSM, Dudhia shortwave, RRTM longwave

 Dec 1, 2003:

   Switch to YSU PBL in the 10 km CONUS run.

   Extend 22 km, 0000 UTC initialization runs from 48 h to 72 h.
   Physics used in 22 km runs:
            KF, NCEP3, YSU PBL, Noah LSM, Dudhia shortwave, RRTM longwave
   Second 0000 UTC initialization run uses NCEP physics:
            BMJ, Ferrier, MYJ PBL, Noah LSM, GFDL shortwave and longwave

   No long makes the GFS-initialized run.

 April 16, 2004:

   Began to run 36/12 km two-way nested run, with 36 km domain covering CONUS, 
            and 12 km domain covering the central US.

   0000 UTC initialization only.
   Physics used in both domains:
            KF, NCEP3, YSU PBL, Noah LSM, Dudhia shortwave, RRTM longwave

   No longer makes the NCEP-physics run.

 April 28, 2004:

   Began to run 4 km sub-continental domain run, 0000 UTC initialization only.

   Physics: Lin microphysics, YSU PBL, Noah LSM, Dudhia shortwave, RRTM longwave