Remains in play. This spell can be cast upon the Wizard himself. If successfully cast, no shooting with Strength 4 or less can be targeted at units within 12" of the Wizard - even if some models in the unit are more than 12" away. The howling wind engulfs the whole unit if any part of it is within 12" of the caster. This doesn't prevent units from firing through or out of the affected area at target beyond. In addition, all enemy units within 12" of the Wizard move at half speed due to the effect of the howling wind. Note that this move penalty only applies when actually within the affected area - enemy treat the entire zone as if it were difficult ground. Once cast, the spell lasts until dispelled, the Wizard chooses to end it (which he can do at any time), attempts to cast another spell or is slain.