Level: Ranger 3
Components: V
Casting Time: 1 swift action
Range: Personal
Target: You
Duration: 1 round
Your bow glows blue for an instant and now feels as light as a feather in your hand. In your mind’s eye you see the arrows in your quiver, and your hand feels drawn to them.
You can cast this spell only at the beginning of your turn, before you take any other actions. After casting arrow storm, you can use a full-round action to make one ranged attack with a bow with which you are proficient against every foe within a distance equal to the weapon’s range increment. You can attack a maximum number of individual targets equal to your character level. If you choose not to spend a full-round action in this fashion after casting the spell, the spell has no effect.
Source: Spell Compendium, page 16.