If you're lost in the rain in Juarez ...

You can use a herd of cows as your compass. According to the BBC, images from Google Earth show that cows tend to align themselves on a north-south axis.
 Of course, cows won't tell you if it's going to rain. You'll need a weatherman to tell you the way the wind blows.
(With apologies to Bob Dylan's Tom Thumb's Blues and Subterranean Homesick Blues)