A tornado that destroyed two farmsteads near Tyler, North Dakota, on Saturday could have been an EF4, the National Weather Service said on Sunday.
Meteorologist Greg Gust of the Grand Forks office said the tornado had higher wind speeds than an EF3, which range from 136 to 165 mph.
"It was scouring a sugar beet field and pulling sugar beets out of the ground so it had a bit of an attitude," Gust told The Associated Press.
The powerful tornado destroyed seven farm buildings and carried a pickup truck about a half mile before depositing it in a field.
Miraculously, no injuries were reported.
Both families were assisted by the Red Cross. One is staying with close relatives and the other is in a local hotel.
Up to seven tornadoes may have touched down on Saturday, but none were as fierce as the one that struck near Tyler, 10 miles west of Wahpeton.
The first tornadoes hit around 7:00 p.m. in Richland County, North Dakota, as the storm moved eastward to several counties in western Minnesota, spawning tornadoes as it went.
Storm chasers in North Dakota and Minnesota captured some of the damage on video.
AP contributed to this report.