Meaning of weather eye

weath'er eye"

Pronunciation: [key]
  1. sensitivity and alertness to signs of change in the weather.
  2. a steady and astute watchfulness, esp. alertness to change.
  3. to be on one's guard; be watchful: He kept a weather eye open for new political developments.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.