COMMENTS FROM THE AUTHOR:
The following Javascript program is freely available for use by any non-commerial fire-related department, organisation or individual.

The following Javascript Exercise has been tested BUT no guarantees regarding the accuracy of the calculations are made. If there are any errors let me know.


Byram-Keetch Drought Index - EXCEL formula courtesy of BOM

All units are Metric!
ENTER THE COEFFICENTS IN APPROPRIATE BOXES
Yesterday's maximum screen temp
(°C)
Site's average annual rainfall
(mm)
24hr Rain to 9am
(mm)
BKDI yesterday

Todays BKDI