def METHOD_NAME(self) -> np.ndarray:
    """
    Calculate the updraught increment from the precipitation rate.
    Calculation is 7.33 * (precip / 28.7)^0.22
    Where precipitation rate < 5 mm h-1, increment is zero.
    """
    increment = 7.33 * (self.precip.data / 28.7) ** 0.22
    increment[self.precip.data < self._minimum_precip] = 0.0
    return increment.astype(np.float32)