Parse the pressure and return FC (String).

def __getBarFCName(pressure):
    """Parse the pressure and return FC (String)."""
    if pressure is None:
        return None
    press = __to_float1(pressure)
    if press < 974:
        return "Thunderstorms"
    if press < 990:
        return "Stormy"
    if press < 1002:
        return "Rain"
    if press < 1010:
        return "Cloudy"
    if press < 1022:
        return "Unstable"
    if press < 1035:
        return "Stable"
    return "Very dry"