DC/Baltimore NWS (LWX) reports map:
http://www.erh.noaa.gov/er/lwx/events/?event=20091219 (hover over the numbers for readable information).
Wow...what a storm. I measured 20" here at the house (Gaithersburg, MD). I spent much of the day in DC streaming live video, where it was difficult as hell to drive, even with AWD. I got stuck a few times, but a quick dig out was all I needed.
I started at around 7am getting my car loaded and already having to dig out about 6 inches that had already fallen. I ventured first through Germantown, then took the interstate south to Bethesda, MD. From there I continued south into DC to an area called Georgetown (the oldest section of the city). While there my car died. Apparently I was running too much power and the car couldn't keep up and the battery died while I was parked (but car running). Luckily I was able to just unplug everything, let the car sit for about thirty minutes and then restarted the car and it was fine, I just ran less stuff. Continuing from Georgetown I went through Midtown and by the White House real quick then south toward Haines Point to attempt a view of Reagan-National Airport (DCA). Crossed the Potomac next and drove by the airport. With the skies starting to darken from the setting sun I headed back into the city and to Capital Hill.
When I was looking for a good shot of the Capital Building I was stopped by Capital Police. This wasn't a surprise and not the first time. It is the weather station on the roof that always seems to get the attention of the various agencies around here. All was on the stream too...it was great. They were cool as was I and in fact they said they could put my tag and DL info into the system (yeah, big brother...I know), but I wouldn't be stopped again the rest of the day, and even in the future possibly. I thought that was cool. I got my shot of the Capital Building, headed back to the White House, and had a failed attempt at streaming from right next to the gates (which isn't accessible by vehicle). However the snow was still falling (around 6pm now) and the laptop was getting too wet.
Time to head north and toward the higher snow fall amounts. After a quick stop in Kensington, MD I arrived back into Gaithersburg simply amazed at the amount of snow (20 inches).
DCA received 16 inches officially making it the record breaker for most snow in the month of December ever (previous record was 11.5"). This storm will likely make the top 10 list for snow storms in DC, but does quite make the top 5.