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PM Update: Following flooding, storm threat continues through the evening; Clearing out on Wednesday

Radar & lightning: Latest regional radar shows movement of precipitation and lightning strikes over past two hours. Refresh page to update. Click here or on image to enlarge. Or see radar bigger on our Weather Wall.

A torrential amount of rain has fallen across the D.C. and Baltimore region today. Over eight inches of rain fell in parts of Anne Arundel and Prince George’s county, making Reagan National’s 1.5 inches look piddly. Rainfall totals and photos are in this post below the forecast. More storms could push into the region this evening, though chances for severe weather have diminished since we originally posted about it around Noon.

Through Tonight: The chance of rain continues this evening, and some new showers have already begun to pop in our western suburbs. Chance of additional rain is 70 percent. Some storms could be strong with heavy downpours. Though a widespread severe weather event is not expected, some isolated severe storms are possible. Lows in the upper 60s downtown and low to middle 60s in our cooler suburbs.

Tonight’s Severe Threat: From our severe weather expert Jeff Halverson: “The prospect for general thunderstorms remains through evening. A couple of narrow convective lines have popped over western Virginia, and these are moving toward the region, along the occluded/cold front, where skies have cleared out ahead of the front and sunshine  has boosted the temperature. These storms are feeding off a ribbon of more unstable air along the mountains. With decent wind shear still in place this evening, I would not be surprised to see a line of storms come through, though they will be working with reduced instability east of the mountains. While some storms could be locally severe, we don’t expect a widespread severe weather threat from these convective lines.”

Tomorrow (Wednesday): A 30 percent chance of rain lingers through the early morning hours on Wednesday. The sky begins to clear out mid-to-late morning as high pressure pushes in. Highs will be in the mid 80s and humidity will steadily decrease throughout the day as dew points drop behind the cold front. Winds could become strong at times — gusts around 20 mph are possible.

See Matt Rogers’s forecast through the weekend. And if you haven’t already, join us on Facebook and follow us on Twitter . For related traffic news, check out Dr. Gridlock.

Pollen: Tree, grass, and weeds are LOW. Mold spores are also LOW.

Huge raindrops fall across the D.C. region on Tuesday. (Bruce Sorrell via Flickr)

Record-breaking rainfall

As of 5 p.m., 6.27 inches of rain had fallen at Baltimore-Washington International. The location blew past its record for the day (which was 4.91 inches in 1955), and has now moved into second place for wettest day on record. The wettest day on record at BWI was August 23, 1933, when 7.62 inches of rain fell.

Radar rainfall estimates show that upwards of eight inches of rain fell in northern Anne Arundel County this afternoon, and some local personal weather stations confirm that estimate. Reagan National has logged 1.6 inches of rain so far today, and Dulles has picked up just over an inch. The second hardest hit area is a swath through southern Prince George’s and Anne Arundel counties, where radar estimates are totaling four to six inches.

Radar estimated rainfall totals. (NWS)

Some incredible flooding images were shared on social media today, and we have a few of them in the original flood post from this afternoon. Unfortunately it looks like the cars parked in long-term parking at BWI will be logged with water when their owners return:

Angela Fritz is an atmospheric scientist and The Post's deputy weather editor.
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Jeff Halverson and Angela Fritz · August 12, 2014

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