Consider this expression
After I came to know/found out the fact that two of my friends will not be able to make it to the party, I decided to call it off.
Every time I come to know/find out/notice/see that water level in the can is below X level, I call the store and they get it replaced
For these two expressions which of the phrases are correct? Is there any difference between the meanings of notice/see/find out/come to know.