How to handle changes made to parameters outside of CF stack?

Question

Let's say I created a stack with the following parameters/resources:

Parameters:
  RDSAllocatedStorage:
    Type: Number
    Default: 20
    Description: Name of the S3 bucket to deploy for storing cloudtrail logs
Resources:
  RdsPrimary:
    Type: AWS::RDS::DBInstance
    Properties:
      AllocatedStorage: 
        Ref: RDSAllocatedStorage
      DBName: Database123
      DBInstanceClass: db.t2.micro

Then in AWS console in RDS Properties I manually change the property RDSAllocatedStorage from 20 to 30. This, however, will not change the parameter RDSAllocatedStorage in Outputs of the stack in CF, so now CF doesn't reflect what's deployed.

Now if I modify the CF change RDSAllocatedStorage to 30 in the template, create a changeset, CF will think there is a change to be made because RDSAllocatedStorage in the stack is 20, incoming change is 30, but in reality there should be no need for a change because the setting on RDS is already set to 30.

Is there a way to bring CF parameter in line with what's actually in resources?