MOUNT OLIVE, Ill. (KSDK) - A preliminary report from the National Weather Service has determined that an EF-2 tornado did briefly touch down Monday night in Mt. Olive.
An EF-2 tornado has winds of 135 miles per hour.
Approximately 35 buildings sustained damage during the storm.
Until the NWS team made its assessment, the thought had been the damage was caused by straight line winds.
PHOTOS: Mount Olive tornado damage
Wes Browning, from the National Weahter Service's St. Louis office, arrived in Mt. Olive around 10:30 Tuesday morning to begin assessing the damage. He got an up close look at the destruction, taking into account the materials the buildings are made of as well as how far debris was thrown.
Browning say the tell-tale sign the Mt. Olive storm was a tornado is the evidence of rotation.
"Most of the debris that we saw was facing due east," said Browning. "However, we've got this large tree here. Most of the branches are thrown off to the east. But we've got a large branch that was twisted back around and thrown in a north-northwest direction. That indicates that there is some degree of circulation with this system."
No injuries were reported in the storm.