def parse_storm_version(version_string):
    """
    Parses the version of storm.

    :param version_string: String containing version information.
    :return: Tuple (version, commit)
    """
    split = version_string.split('-')
    version = split[0]
    commit = ''
    if len(split) > 1:
        commit = split[1]
    return version, commit
