<p>A large supercell was seen over Burlington, near the Colorado-Kansas border, on Sunday, May 27.</p><p>Storm chaser Francis Lavigne-Theriault called the huge storm a “mothership” for its looming alien appearance.</p><p>Denver-based 9NEWS</a> said a tornado warning was issued for the area, while the National Weather Service Burlington warned</a> the tornado threat would continue into Monday. Credit: NZP Chasers via Storyful</p><br />
