You can't have been the only person sent into Stormwind to deploy those devices containing wind elementals. We have to find and disable the rest of the devices before they set their captive elementals free to create storms in the city.
Are you familiar enough with the devices to destroy them? Our best chance is to break the devices before the elementals inside can reach full strength. Look for the devices in the Trade District, Cathedral Square and the Mage Quarter. Hurry!