He was about to leave, then decided to give her one last warning.
She came of her own free will to give me a warning.
More likely, they would have been given a warning and sent on their way.
There was no time to speak, even to give warning.
But they can also give an early warning of other conditions.
It will give you a warning as to what's to come.
This information can give you a warning of potential problems.
"We were given a warning and had 10 minutes to get to safety."
If he has been on for 45 minutes, his mother gives him a 10-minute warning.
"I'm giving you a little warning about the situation out here."