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Updates:

- Implemented user-defined calibration interval (Jun 5 2006) -- goddard
- A more intuitive format for the parameter file is accepted:
     AWC Latitude
  The '-n' flag was added to facilitate the old format: AWC TLA (Jul 15 2003)
- Calculates the Weekly CMI (Jul 1 2003)
- Works in with southern latitude (Apr 1 2003)
- Works with the metric flag (Mar 12 2003)

  • Self-calibrating, multiple time scale version. Based upon weekly_pdsi.cpp which is a self-calibrating, weekly PDSI program developed by Nathan Wells. This version is capable of calculating a self-calibrating weekly PDSI, a self-calibrating monthly PDSI, and the original monthly PDSI.

  • Most recently translated to C++ from FORTRAN by Rob Reed and Nate Wells, University of Nebraska - Lincoln, advised by Dr. Steve Goddard - July 2001.

    Methodology based on Research Paper No. 45; Meteorological Drought; by Wayne C. Palmer for the U.S. Weather Bureau, February 1965.

  • Based mostly on the source code of pdsi.f, a FORTRAN program that calculates monthly PDSI values. The source code came from NCDC, originally written by Tom Karl, and revised by Roger Winchell, Alan McNab, and Richard Heim.

  • Slight modifications in the algorithm were made based on the source of palmcode.f, a FORTRAN program that calculates weekly PDSI values, received from Tom Heddinghaus at NCEP, who is also the original author of that particular code.

    Additional modifications were made to adapt the algorithm to a weekly time scale based on recalculations of several constants as described in Palmer's paper.

  • August 2001

Additional modifications were made to attempt to make this program completely independent of emperically derived formulas. This will allow the program to perform accurately in any enviroment. Most changes came in the addition of the Calibrate() function. These changes were made in order to make comparisions between stations more accurate. --

  • May 2002
    The incorporation of a self-calibrating monthly and the oringal monthly PDSI.

  • Jun 2002
    Changed the calibration method to calibrate the climatic characteristic based on the quartiles instead of the max and min.