The National Weather Service in Davenport, Iowa, says the EF1 tornado formed near Atkinson in Henry County on Tuesday morning. The tornado had winds reaching 100 mph.
According to weather officials, the tornado touched down at 9:59 a.m. before lifting up five minutes later, causing damage to trees and farm outbuildings. It traveled on the ground for about four miles and was 50 yards wide.
No injuries were reported.
The National Weather Service says the Enhanced Fujita Scale classifies tornadoes based on damage. The EF1 category is used for weak tornadoes with winds from 86 to 110 mph.