Searching for possible uses of the phrase "if and when..."?

Question

I was wondering about what possible conocations can be drawn from the phrase "if and when" or "when and if" as contrasted with a weaker phrase such as "if it happens that..." I found an author (at the link below) who preferred "if it happens that..." but I found this phrase to be unsuitable for my emotional writing style. For one thing, the phrase, "if it happens that..." seems to imply that you don't really care whether something takes place or not.

I would appreciate it if some writers gave me feed back on their thoughts, and how they like to use this phrase in a sentence.

http://parablemania.ektopos.com/archives/2005/12/if_and_when.html

Answer 1

I think you mean connotations.
If and when you decide to do the dishes, I'll be waiting with a dishtowel.
If and when is a fairly strong statement and can often be read as a command and/or an expression of scepticism.
If and when we leave for vacation, I'll make sure I pack your bags.

Answer 2

If and when an earthquake occurs, run for shelter.

There's also another -"as and when"

These are mostly used when to both the conditional words if and when, you have the same clause or phrase as the solution.

Answer 3

I've seen and heard it used as "If and when you decide to behave yourself, I might let you go shopping," Or "If and when he/she calls, I'll let you know."

It means that you are not sure something will occur, but IF AND WHEN it does, you'll know about it. :)