From publisher blurb:
For a level 11 party!
It's the storm no one will be able to forget... that is, of course, if there's anyone left around to remember it. Days after fighting off an incursion by a legion of hobgoblins, a great storm fell upon the kingdom. Rain pours relentlessly, thunder pounds across the air, and lightning ravages the landscape. Days have passed and the storm shows no sign of letting up!
Any relief felt from defeating the hobgoblin invaders has been scoured away; the thunderstorm grows larger, more violent, and more dangerous with each day. There are not many silver linings to be found, although there is a group of capable heroes in town looking for an adventure. Only the PCs are strong enough to investigate the storm's origin and bring an end to it to save the kingdom. But if they don't act soon, there may not be anything left of the kingdom to save!