Washington, DC has had an 5.9 RS earthquake and is expecting aftershocks.
If you're in the area, keep perishable foods, plenty of bottled water and weapons/firearms on hand; you may also want to put some of these items in your auto, in case you must evacuate your house. Please don't forget the water, as it's very hot here in DC.
Keep a half-full glass of water in a centrally visible location and monitor it for shaking. If you think it's something other than an air-conditioner, passing truck or some kind of machinery, head for an exit.
We're okay here, so far.