In my world, modern humans are at war with elf-like humanoids who are harmed by the touch of iron and steel. So instead of modern tools they use bio-tec and elemental magic. The human army is ready to invade, but the elemental elves have constructed a wall of powerful storms. How would the human army get around this? (remember only modern technology)
Note: The humans don't want to use nukes because they fear that the elves may respond with superplagues that they might have.