No injuries were reported in the collapse near Blue Parkway and Chipman Road, but about 75 percent of the stand's inventory got wet and can't be sold.
The stand had only been open for a few hours when the storm came through. Paws for Autism, a group that pairs children with autism service dogs, runs the tent.
Co-founder Terri Wible said five volunteers and three service dogs were in the tent when it collapsed.
"We were inside and had finally gotten all the flaps down on the tent and it was a heavy rain, there was wind, we were just trying to ride out the storm. All of a sudden, there was a huge gust of wind and half of it just came crashing down," Wible said.
Paws 4 Autism uses the stand to raise money. It's the organization's top fundraiser for the year, and the loss of the fireworks inventory will hurt.
Organizers said they hope they'll be able to salvage some of the fireworks.