Hmmmm - I am not up to date with modern ATC practices and weather was almost never an issue when I did my flying in Africa.
OTOH, I still think it would be a good idea to include some idea of how long the bad weather is likely to last and how long it would then take to clear the current backlog.
Do the weather men and the approach controllers talk to eachother ?
It seems to me that too many crews hang around wasting valuable diversion fuel in the futile hope of landing when they would have diverted earlier if they had some idea of how long the delays are likely to be.