def convert_location_to_wgrib2(stations):
    """Convert locations to colon separated string

    Args:
        stations (pd.DataFrame): Dataframe of station location information

    Returns:
        str: locations formatted for wgrib usage
    """
    locs = []
    for lat, lon in zip(stations['latitude'].values, stations['longitude'].values):
        locs.append(f'{lon}:{lat}')
    return ':'.join(locs)