D&Dtools1

With a thought and a word you complete the spell. Your weapons shift color, becoming blue for a moment, and feel lighter in your hands. An unseen force guides them, pulling them toward your enemies.

You can cast this spell only at the beginning of your turn, before you take any other actions. After casting blade storm, you can take a full-round action to make one attack with each melee weapon you are currently wielding against every foe within reach. If you wield more than one weapon, or a double weapon, you can attack each foe once with each weapon or end, using the normal rules for two-weapon fighting (PH 160). So, a ranger wielding a longsword and a short sword could attack each opponent he can reach with both weapons. If you choose not to spend a full-round action in this fashion after casting the spell, the spell has no effect.