def remember_umbrella(weather_arg: str) -> bool:
    """Remember umbrella

    Checks current weather data text from :meth:`get_weather` for keywords indicating rain.

    Args:
        weather_arg: String containing current weather text of specified city.

    Returns:
        True if any of the rain keywords are found, False otherwise.

    """
    # Check weather_arg for rain
    tokens = ['rain', 't-storms']
    """list: Strings of keywords that indicate rain."""

    weather_arg = weather_arg.lower()  # To match tokens' case

    for token in tokens:
        if token in weather_arg:
            return True
    return False