A tornado emergency warning was in effect early Sunday at the University of Oklahoma’s Norman campus, officials said.

The warning was posted on the school’s official X account at 1:22 a.m. At 1:55 a.m. and 2:02 a.m. the school issued additional warnings

“Seek shelter in the building you are in NOW,” the first message said. “Go to the lowest floor/interior.”

The National Weather Service said it was watching for tornadoes across central and eastern Oklahoma early Sunday. A small area of ​​northwest Texas was also under a watch, the agency’s Storm Prediction Center said in an urgent update at 1:40 a.m

The center said about 15 minutes later that it had seen several “individual supercells” that had “matured within the open warm sector over OK.”

“A tornado watch means conditions are favorable for tornadoes and severe thunderstorms in and near the observation area,” the center said. “People in these areas should remain vigilant for threatening weather conditions and watch for subsequent statements and possible warnings.”

There is also an isolated possibility of damage from wind gusts of up to 70 miles per hour and large hail, perhaps about 2 inches in diameter, in parts of the same area, weather officials said.

This is a developing story. Please check back for updates.