def fss_init(thr, scale):
    """
    Initialize a fractions skill score (FSS) verification object.

    Parameters
    ----------
    thr: float
        The intensity threshold.
    scale: float
        The spatial scale in pixels. In practice, the scale represents the size
        of the moving window that it is used to compute the fraction of pixels
        above the threshold.

    Returns
    -------
    fss: dict
        The initialized FSS verification object.
    """
    fss = dict(thr=thr, scale=scale, sum_fct_sq=0.0, sum_fct_obs=0.0, sum_obs_sq=0.0)

    return fss