Severe Thunderstorm...

"National Weather Service has issued a Sever Thunder Storm warning for the District Of Columbia and Metropolitan area. Scattered showers & Thunderstorms will affect the Washington area until 745AM Thunderstorms will contain cloud to ground lighting along with Locally heavy rain hail size of quarters with damaging winds in excess of 60MPH Storm moving southwest at 25MPH."

I can confirm this because...when the bottom fell out I was down by the Capitol finishing up my Thursday morning run. The rain was pouring down so hard that I could barely see to run home. There's no better way to cool off after a run!