def describe_pressure(pressure):
    """Convert pressure into barometer-type description."""
    if pressure < 970:
        description = "storm"
    elif 970 <= pressure < 990:
        description = "rain"
    elif 990 <= pressure < 1010:
        description = "change"
    elif 1010 <= pressure < 1030:
        description = "fair"
    elif pressure >= 1030:
        description = "dry"
    else:
        description = ""
    return description