Wind
Divination from observation of the winds is an ancient practice. A form of aeromancy, it was specifically called austromancy.
Wind has always been a mysterious phenomena. For countless centuries, humans had no understanding of the forces that create breezes, gusts, whirlwinds, and storms. Many believed that wind was actually the breath of their deities: alternately, some thougtht that specific types of winds, particularly hot winds, were the work of demons.
Several techniques involving wind can be used. Most of the ancient forms were created and used in limited geographical locations, where winds stemming from certain directions were known to predict events. Much of this information has been lost. However, general forms of wind divination are also available for use.
Go to a place where few trees or buildings block the wind. If it's already windy, wait until the air grows calm. Ask a yes or no question and watch the winds.
If, in the unlikely event that a whirlwind - sometimes known as a "dust devil" - suddenly appears, it is an unfavorable omen. Further divinations using other techniques may be necessary to determine the exact nature of such a warning.
Another method uses the winds in a different manner. Write five possible futures, or five choices that you're currently facing, on five round pieces of paper. Take these outside to a windy place. Draw a circle on the ground and lay the papers within it. The wind will eventually rise and blow the papers from the circle.
The last paper to remain within the circle reveals the best possible choice (or most likely future event). If they're all simultaneously removed by the wind from the circle, no response is possible at this time. If no wind rises, again, there is no answer. (Please don't litter - gather the papers after use and dispose of them properly.)
The wind has also been used in a number of other ingenious ways. For example, sit beside a lake (or even a swimming pool). Ask a question and watch the water's surface. If the wind picks up and produces ripples on the water's surface, that answer is yes. If not, no.
Divination For Beginners
Reading The Past, Present & Future
Scott Cunningham
ISBN 0-7387-0384-2