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Posted at 09:20 AM ET, 08/15/2011

Late arriving Sunday rains produce wide range of totals through D.C. metro region

Sunday’s rainfall amounts reported through the Community Collaborative Rain, Hail and Snow Network.
When the heavy rain finally arrived Sunday evening, it fell fast and furious in many areas. But, in some spots, it was pretty much a no show. Amounts were highly variable ranging from as little as 0.1” west and southwest of the District to almost 3” in portions of Montgomery and northeast Prince George’s county. The locations with the highest totals were subject to some extreme rainfall rates as well as an onslaught of lightning.

Some select totals:


Reagan National Airport: 1.37”
Dulles: 0.08”
BWI: 0.65”

Keep reading for totals from locations in Virginia and Maryland and some dramatic lightning video.

Doppler indicated rainfall estimate for Sunday shows the large variability in precipitation, with amounts trending higher to the north and northeast.


Frederick: 0.55”
Waldorf: 0.57”
Camp Springs: 0.57”
Severna Park: 0.76”
Wheaton-Glenmont: 1.02”
Columbia: 1.11”
Rockville: 2.04”
Laurel: 2.7”
Damascus: 2.72”
College Park: 2.82”


Woodbridge: 0.09”
Herndon: 0.24”
Fairfax: 0.25”
Vienna: 0.28”
McLean: 0.5”
Leesburg: 0.77”

North and east of the metro region, some very impressive totals were logged. Baltimore City received 3.21” and Ocean City, 4.4” (enough to flood coastal highway - picture)


Several of our Facebook followers noted the intensity/frequency of not only the rain, but also the lightning from last night’s storms.

Here’s one report from Kenneth James in Old Town, Alexandria: “Oh and this lightning, it was INCREDIBLE. Nonstop for well over an hour.”

Check out this video from New Market in Frederick county, Maryland:

Description: A spectacular electrical storm lit up the sky over New Market, Md., on Sunday night as part of a weather front that left thousands in the area without power.

How was the forecast?

Not bad. Not great. We correctly identified the potential for heavy rain and emphasized there would be lulls in the activity and large variability. We also mentioned greater amounts would tend to be north which beared out. But, having said that, rainfall was less than forecast for locations to the west and southwest of the Beltway which only got around 0.1”. The other problem with our forecast was that Sunday afternoon turned out a lot nicer than we anticipated as the soaking rains arrived after 7 or 8 p.m.

By  |  09:20 AM ET, 08/15/2011

Categories:  Floods, Local Climate, Latest

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