Code contains Python3 and Fortran90 modules/subroutines to calculate the deterministic and probabilistic Fractions Skill Score (FSS). Now distinct functions for the deterministic FSS and the comparison of different FSS flavors are added. A corresponding article will be published.
This version addresses the issue of an undefined FSS if both the forecasted and the observed probabilities are zero. In that case an FSS of 1 is assigned.