You form an enormous tower of dark, swirling storm clouds and howling wind.
(Spell Compendium, p. 210)
Originally posted on D&D tools
Level: Druid 7,
Components: V, S,
Casting Time: 1 round
Range: Long (400 ft. + 40 ft./level)
Area: Cylinder (20-ft. radius, 100 ft. high)
Duration: 1 round/level (D)
Saving Throw: Fortitude negates; see text
Spell Resistance: Yes
A storm tower absorbs any electricity damage dealt to those within it. Magic missiles cannot be cast into, out of, or within a storm tower. The storm tower is composed of windstorm-strength winds (DMG 95), making ranged attacks impossible within it, though it has no effect on the movement of creatures within it. However, only Gargantuan or Colossal creatures can pass through the outer edge of the storm tower; all creatures of smaller size must succeed on a Fortitude saving throw to enter; otherwise, they are checked at the edge.
Anyone within a storm tower has concealment relative to those outside the tower. The howling winds of a storm tower also apply a -10 penalty on Listen checks made within 50 feet of it (including all those made inside the tower).