Torrential rain produces flash flooding around Alexandria - The Washington Post

* Flash flood warning for much of the Beltway area and locations to the west through 3 to 4 a.m.. | Flash flood watch for remainder of region through 4 a.m. *

2:05 a.m. — Rainfall intensity easing but expect residual flooding to linger for next few hours (final update)

Radar shows the rain has let up some but flooding is ongoing in parts of the region, especially around Alexandria and just east of Manassas where up to 5 inches has fallen in just two hours. More generally, most locations west and southwest of downtown Washington have seen 1 to 3 inches The good news is that the worst is probably over although some brief, locally heavy downpours remain possible over the next couple of hours.

While the rain has eased, high water remains and is best to avoid travel until daylight, especially if you’re in the zone between Manassas and Alexandria. The flooding has closed numerous roadways and led to some stranded vehicles. For example, the Weather Service received these reports:

• A vehicle was stuck on the ramp between the Beltway and Interstate 95 in Alexandria
• A vehicle was stuck at the Route 50 and Rt. 7 Intersection in Falls Church (near Seven Corners)
• Old Richmond Road was closed around Richmond Highway in Alexandria due to high water
• The stream gauge on Backlick Run in Landmark rose 6 feet in under 30 minutes

As noted earlier, King and Prince streets in Old Town were also closed due to flooding.

This will be our last update of this event tonight. Please stay safe.

1:30 a.m. — Radar indicates up to 4 inches of rain has fallen in parts of Alexandria; another 1 to 2 inches are possible

Alexandria has been hardest hit by the middle of the night torrent with the heaviest totals exceeding 4 inches around Huntington. We’ve seen additional reports of road closures in Alexandria, including Prince and King streets in Old Town.

The rain is not as extreme now as it was over the past 60 to 90 minutes but is still quite heavy and could produce another inch or two over the next hour or two. Again, hold off on any travel until daylight if possible.

1:10 a.m. — Rainfall rates have been up to 3 inches in 30 minutes!

1:05 a.m. — Flooding already reported in Alexandria

We’ve received reports of flooding in Alexandria from the Del Ray area on Twitter, see image below; in addition, the National Weather Service received a report of high water blocking three lanes along Interstate 395 near the Glebe Road exit.

“Just drove 395 out of downtown- treacherous and many flooded areas with stalled cars,” tweeted @NatHokie.

Best to stay off the roads overnight.

12:50 a.m. — Flash flood warnings issued for much of immediate D.C. area

Torrential rain has spread over most of the area inside the Beltway and just to the west over the past hour. The heaviest downpours, where doppler radar indicates two to three inches have fallen in the last hour, have focused over Alexandria. These storms are very slow-moving and could produce another 1 to 3 inches of rain over the next couple of hours, meaning widespread totals of at least 2 or 3 inches are likely with localized amounts up to 4 to 6 inches. Such amounts have the potential to cause considerable flash flooding in areas of poor drainage and near streams.

Remember to never cross a flooded road in your vehicle. Turn around, don’t drown.

8:30 p.m. — Showers and storms may be spotty despite flash flood watch

Very little shower and storm activity has materialized in the immediate region so far this evening. However, the atmosphere contains high moisture levels and, as a cold front pushes through overnight, some slow-moving heavy downpours could develop, which is the basis of the flash flood watch which takes effect at 10 p.m. Based on radar trends and short-term models, however, it seems coverage of any rain will be spotty rather than widespread.

Original article

After hitting at least 90 degrees in many spots along and east of the I-95 corridor this afternoon, thunderstorms are moving in. They may be strong to severe through this evening, especially south of D.C. At least we won’t hit 90 degrees again for a while, thanks to this cold front moving through. Tomorrow is pleasant, but we can’t eliminate rain chances (which rise again for the workweek).

Through Tonight: A few evening showers and storms remain possible, even into the midnight hour. Skies remain mostly cloudy. Mugginess drops as dew points dip from around 70 degrees in the evening to near the 60-degree mark by dawn. Be patient as the drier air is slow to trickle in. Temperatures bottom out in the upper 60s to low 70s.

Tomorrow (Sunday): Noticeably less warm. Clouds generally dominate over sunshine and that helps keep high temperatures near 80 to mid-80s. With dew points in the pleasant 50s for a few hours, it may feel refreshing. We could see a brief shower, especially south of D.C.

Tropical moisture heading our way next week

Fred is the first tropical system remnants that may head our way and enhance rains next week. Some of our region needs the rain but it may fall in too short of a time frame. We will keep you posted on continued spotty flash-flooding risk this week.

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Torrential rain produces flash flooding around Alexandria - The Washington Post
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