The tornado hit around 5:30 p.m. on Thursday, October 13, 2011, in Quantico, Prince William County, Virginia. There were reports of some minor damage including shingles removed from roofs and uprooted trees. Based on the damage and the videos posted on YouTube, the strength of the tornado was likely an EF-1, producing winds around 80 miles per hour. A large trough (extended area of low pressure) pushed into the eastern United States, providing enough moisture and spin in the atmosphere to produce small tornadoes across the mid-Atlantic states.