Returns a tuple of (metadata, raw data)

def raw(self, format=None, **kwargs):
        """
        Returns a tuple of (metadata, raw data)
        """
        station_codes = self._apply_features_filter(self._get_station_codes())
        metadata = self._get_metadata(station_codes, **kwargs)
        raw_data = self._get_raw_data(station_codes, **kwargs)

        return (metadata, raw_data)