The National Weather Service says a tornado that caused damage in the Hillsboro area had wind speeds up to 140 miles per hour.
The weather service rated the Saturday twister in Traill County an EF3.
An EF2 or higher rating is considered a significant tornado.
It smashed bins at a grain elevator complex, destroyed a garage and uprooted trees on one area farmstead, and heavily damaged a home and a metal building at another farmstead. No one was hurt.
Storms on Saturday spawned two other weaker tornadoes in Grand Forks County.
The weather service is still working on rating a tornado that hit Norman County Sunday night.