The Great Gatsby
The Great Gatsby, warned
I'd like to know if "warned" in the following excerpt of the chapter Seven of The Great Gatsby means "informed" or "premonished", "to have a feeling of":
That locality was always vaguely disquieting, even in the broad glare of afternoon, and now I turned my head as though I had been warned of something behind. Over the ashheaps the giant eyes of Doctor T. J. Eckleburg kept their vigil but I perceived, after a moment, that other eyes were regarding us with peculiar intensity from less than twenty feet away.
Thank you.