    sscurr = (ncurr.variables["fcst"][lead]+ncurr.variables["fcst"][lead+1]+ncurr.variables["fcst"][lead+2])/3.0
    ssclim = (ncurr.variables["fcst"][lead]+nclim.variables["fcst"][lead+1]+nclim.variables["fcst"][lead+2])/3.0
    anm = (sscurr - ssclim) * 86400
