Not sure, just saw the Green on the NWS. Let's check the verbiage. By the way some sweet sweet 50's DP's tomorrow on the HRRR and GFS.
...FLOOD WATCH IN EFFECT FROM 4 PM EDT THIS AFTERNOON THROUGH THIS
EVENING...
* WHAT...Flash flooding caused by excessive rainfall is possible.
* WHERE...Portions of DC, Maryland and northern Virginia, including
the following areas: in DC, District of Columbia. In Maryland,
Anne Arundel, Carroll, Central and Southeast Howard, Central and
Southeast Montgomery, Northern Baltimore, Northwest Harford,
Northwest Howard, Northwest Montgomery, Prince Georges, Southeast
Harford and Southern Baltimore. In northern Virginia,
Arlington/Falls Church/Alexandria, Eastern Loudoun, Fairfax,
Prince William/Manassas/Manassas Park and Western Loudoun.
* WHEN...From 4 PM EDT this afternoon through this evening.
* IMPACTS...Excessive runoff may result in flooding of rivers,
creeks, streams, and other low-lying and flood-prone locations.
* ADDITIONAL DETAILS...
- Afternoon to evening showers and thunderstorms may produce
very heavy rainfall capable of flash flooding. This could
include multiple rounds of storms which would enhance the
flood risk. Rainfall rates may reach 1 to 2 inches per hour,
locally higher in spots. The D.C. and Baltimore metros will
be the most susceptible given recent heavy rainfall the past
couple of weeks.
- http://www.weather.gov/safety/flood