Recognizing Tornado Danger Signs

Dark, gray/green skies

Photo courtesy

As we continue to talk about tornadoes as part of the upcoming statewide tornado drill and the county government’s three-day emergency exercise, what are some signs of a developing tornado you should look for in case you don’t have access to a weather radio, social media or traditional media outlets (or if you’re just not sure)?

  • Dark, often greenish sky
  • Large hail
  • A large, dark, low-lying cloud (particularly if rotating)
  • Loud roar, similar to a freight train

If you see approaching storms or any of the danger signs, be prepared to take shelter immediately.

More information about what to do before, during and after tornadoes can be found on our emergency website and on

About Fairfax County Emergency Information

Official emergency information about preparedness, response and recovery from Fairfax County Government.