def _write_hmet_card_file(self, hmet_card_file_path, main_output_folder):
        """
        This function writes the HMET_ASCII card file
        with ASCII file list for input to GSSHA
        """
        with io_open(hmet_card_file_path, 'w') as out_hmet_list_file:
            for hour_time in self.data.lsm.datetime:
                date_str = self._time_to_string(hour_time, "%Y%m%d%H")
                out_hmet_list_file.write(u"{0}\n".format(path.join(main_output_folder, date_str)))
This function writes the HMET_ASCII card file
        with ASCII file list for input to GSSHA