The Technical Procedures Bulletin was written by Roland R. Draxler of the Office of Oceanic and Atmospheric Research, Air Resources Laboratory.
The HYSPLIT model for the prediction of dispersion and deposition of radiological pollutant plumes was fully transferred to the NWS/NCEP Cray computer system on 26 October 1998 at 1200 UTC. The HYSPLIT model has been used as the dispersion model component of NCEP/ARL's Regional Specialized Meteorological Center (RSMC) for transport model products since the RSMC's inception in 1992. Prior to its transfer to NCEP, the model was run operationally on ARL's computer which is not the most suitable environment for use in an operational 7/24 program.
A brief description of the model with links to more technical documentation can be found at:
The body of the bulletin in Full HTML Text or PDF File.