.month - 2] + str(date.year) + &#34;.1.gbl1&#34;
        else:
            prev = &#34;RP.&#34; + mons[-1] + str(date.year - 1) + &#34;.1.gbl1&#34;

        if not date.month == 12:
            next = &#34;RP.&#34; + mons[date.month] + str(date.year) + &#34;.1.gbl1&#34;
        else:
            next = &#34;RP.&#34; + mons[0] + str(date.year + 1) + &#34;.1.gbl1&#34;
        return [curr, prev, next]

    def get_gdas_metfiles(self, date):
        gdas_file = lambda date: &#34;gdas1.%s%s.w%s&#34; % (
       