APPLETON, Wis. -

A thunderstorm that caused substantial damage in central and northeastern Wisconsin hit the Outagamie County area particularly hard.

The National Weather Service has dispatched a survey team to see if a tornado touched down near Wrightstown.

According to Wisconsin Emergency Management, an elderly couple had minor injuries at a campground in Fremont in Waupaca County near Outagamie County border.

We Energies reported damage to three of their substations, causing 48,000 customers to lose power in mostly in Outagamie County. We Energies spokeswoman Cathy Schulze says it could take several days before power is restored to everyone.

All surgeries were canceled at Appleton Medical Center for Wednesday because they are operating on generator power.

The county and Grand Chute have both declared a State of Emergency.

A Brown County sheriff's official describes the storm that hit central and northeastern Wisconsin as devastating.

Lt. Kevin Wickman says straight line winds destroyed storage sheds and took down trees and power poles.

According to Wisconsin Emergency Management officials, more than 100 homes were damaged by the storm, with one destroyed and one with major damage. Significant crop damage was also reported in the county.

The state estimates damage to residential areas at $2.1 million. There were also four businesses that had major damage, with repair costs estimated at $650,000.

Wickman says deputies even found the top of silo in a road Wednesday and didn't know where it belonged.

Some large trees also came down at a campground, but no one was injured.