Once you have gathered the needed items for your spell and cast your circle, turn to the north and call the wind with something like the following:
Turn to the East and call:
Turn to the South and call:
Turn to the West and call:
Invoking the winds is an old practice that dates back to the ancient Greeks and possibly earlier. The power of winds powers can give tremendous intensity to your magick. Depending on which wind is blowing, vibrations on the earth will differ.
When invoking the winds for spellwork, you will need to be outside.