Severe Thunderstorm Watch map on 4/6/23 (via National Weather Service)

Arlington and much of the D.C. area is now under a Severe Thunderstorm Watch.

The watch is in effect until 10 p.m.

Forecasters say today’s sunshine and warmth may fuel strong storms starting this afternoon. Damaging winds and hail are possible through the evening hours.


4437 18th Street N. (via Google Maps)

(Updated at 1 p.m. on 03/21/23) Arlington County is looking to buy its first home for flood prevention.

The county has entered an agreement to buy the home at 4437 18th Street N. in the Waverly Hills neighborhood for $969,200, according to a staff report to the Arlington County Board.

The Board is set to review and approve the agreement during its meeting on Saturday.

The single-family home and detached garage is located in the Spout Run watershed, which has been hit hard by recent flooding events, such as the floods seen in July 2019. It will be torn down and the property will be replanted to serve as “overland relief,” at a cost of around $350,000.

Overland relief is a safe flowpath for flood waters to the nearest stream or storm drain during a large storm event. (An earlier version of this story incorrectly explained overland relief.) 

Arlington County is looking to step up its mitigation efforts in response to severe weather events. While the 2019 flood has been described as a “100-year flood” — or a flood that has a 1% chance of happening each year — some research suggests these may occur more frequently due to rising sea levels and more frequent and severe storms, which are linked to climate change.

As part of this effort, last year county staff sent letters of interest to 38 properties in parts of the Waverly Hills and Cherrydale neighborhoods where overland relief is “an essential element” to manage extreme flooding, the report says. Funding for this voluntary property acquisition program was included in the adopted one-year 2022 capital improvement plan.

“The County will pursue acquisitions of properties whose owners are willing to sell to the County, and whose properties would allow for greater access to existing stormwater infrastructure for potential future upgrades, provide overland relief during periods of intense rainfall,and other future engineering solutions,” it says.

“Several” owners have indicated interest in selling to the county, the report added.

ARLnow last reported that there is some interest among residents in selling, while a number of others say that uprooting their families would come at too high a cost.

We were also told several had unanswered questions about the process and how these properties will be managed. One concern is that a piecemeal acquisition process would result in a “checkerboard” of homes and blighted-looking properties.

That “checkerboard” could result in “community fragmentation, difficulty with providing municipal services, and inability to restore full floodplain functionality,” and is one reason local governments may have a hard time getting enough community support for buyouts, according to a Congressional Research Service report.

Other reasons include the potential impacts on property values and housing stock and fears of displacement, it says.

Still, people are more likely to be interested in selling after a major flooding event.

“Buyouts are often a politically unpopular option unless there is a particularly catastrophic event that changes people’s willingness to move and creates unified state and local support for relocation,” the report noted.

A still from a video showing flooding in the Waverly Hills neighborhood on May 22, 2018 (via YouTube)

Other research shows that property buyouts are one of the most effective tools at the disposal of local governments to combat frequent flooding.

“At their best, they provide a permanent solution,” according to Pew Research. “Effective buyouts prevent future damage, make people safer, and ideally protect entire neighborhoods or communities. Moreover, once bought-out properties become natural open space, they can provide an added benefit of absorbing additional stormwater, further reducing flooding and helping to conserve habitats.”


A still from a video showing flooding in the Waverly Hills neighborhood on May 22, 2018 (via YouTube)

Arlington County is looking to buy homes within the Spout Run watershed for flood mitigation.

Since last fall, the county has notified some three dozen property owners in the Cherrydale and Waverly Hills civic associations by letter of its interest in buying their properties for stormwater management. The letters targeted areas that were hit hard by recent flooding events, like the floods seen in July 2019.

Should they agree to sell, the county would tear down the homes, remove infrastructure such as driveways, and then regrade and replant the land to minimize erosion. Properties would be preserved for open space.

“Phased property acquisition is a necessary component of a resilient stormwater improvement program to provide overland relief and reduce flood risk to the community,” Dept. of Environmental Services spokeswoman Katie O’Brien said. “Voluntary property acquisitions will be targeted to areas in the five critical watersheds at higher risk of flooding due to existing topography.”

Five critical watersheds in Arlington County (via Arlington County)

The county’s first priority is to create “overland relief,” or a safe path for stormwater to flow during large rain events, per presentation materials on the county’s website. It contends that there is not enough public space to provide those paths or make infrastructure upgrades, and, crucially, that existing stormwater systems were built assuming sufficient overland relief to handle anything stronger than a 10-year storm (which has a 10% chance of happening annually).

“There is not sufficient available space within existing rights-of-way to maintain the infrastructure, make resilient system upgrades, or to provide overland relief,” the presentation says. “There is no long-term solution to reduce flood risk in Spout Run without adding overland relief.”

The solution is a long time in coming for some in the Waverly Hills Civic Association, which — along with the Cherrydale Citizens Association — has met with Arlington County about stormwater management solutions since 2018.

WHCA President Paul Holland says he has heard several residents express frustrations related “to the extended timeline to identify a solution” to the flooding that occured in recent years.

“For the Waverly Hills Civic Association, stormwater issues are our top priority. Our neighbors were dramatically impacted by major flooding events in 2018 and 2019,” he said.

Both Holland and Cherrydale Citizens Association President Jim Todd said several questions remain unanswered, however.

“There was a lot of concern that the county was really, really vague and didn’t seem to know or be willing to share what they intend to do with any of the properties they intend to acquire,” Todd said, adding that he heard from constituents who felt they didn’t get much clarity after calling the county’s real estate office.

Although WHCA members worked with the county to develop an FAQ page addressing many of the questions, they too have outstanding concerns.

“Our primary concern is that the acquired lots will be well designed and taken care of by the County to become usable park land and/or attractive open space as neighborhood amenities,” said Holland.

Todd, however, said he is unsure how the county will be able to create any meaningful overland relief if only a smattering of people sell.

(more…)


Flags blowing in the wind at Arlington County government headquarters (staff photo by Jay Westcott)

Get ready for a particularly breezy afternoon and evening.

Arlington and much of the D.C. region will be under a Wind Advisory, starting at 1 p.m. today (Tuesday).

…WIND ADVISORY IN EFFECT FROM 1 PM THIS AFTERNOON TO 7 PM EST THIS EVENING…

* WHAT…West winds 20 to 30 mph with gusts around 50 mph expected.

* WHERE…The Washington and Baltimore Metropolitan areas, northern and central Virginia, and eastern West Virginia.

* WHEN…From 1 PM this afternoon to 7 PM EST this evening.

* IMPACTS…Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

PRECAUTIONARY/PREPAREDNESS ACTIONS…

Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects.

Although some overnight rain dampened the ground, low humidity this afternoon may enhance the risk of wildfires.

Arlington is not immune from such risks and typically sees a few small brush fires each year.

…ENHANCED THREAT FOR THE SPREAD OF WILDFIRES THIS AFTERNOON…

West winds of 20 to 30 mph will gust to 40 to 50 mph will develop this afternoon into early this evening across central Virginia, northern Virginia, and the Shenandoah Valley. These westerly winds will be accompanied by minimum relative humidity values of 20 to 30 percent. Although fuels are relatively damp owing to recent rainfall, they will quickly dry out, leading to an enhanced threat for the spread of wildfires.

Outdoor burning is strongly discouraged during this time. Please refer to your local burn permitting authority on whether you can burn. If you do burn, use extreme caution and ensure fire suppression is readily available.

Also today, there’s a chance of thunderstorms with the passing of a cold front in the early afternoon.

Some of the isolated storms may cross the immediate D.C. region.


VDOT snow plow spreading salt on N. Glebe Read in 2021 (staff photo)

(Updated at 3:45 p.m.) A major storm affecting most of the eastern U.S. and midwest is set to ramp up tomorrow, making for hazardous holiday travel.

Ahead of the storm, the Virginia Dept. of Transportation sent a clear message this afternoon: start your trip now, if you can.

The storm will mostly bring the D.C. area copious amounts of rain starting Thursday morning, along with gusty winds and bitter cold temperatures on Friday. Frozen precipitation beyond some possible snow flurries is not expected in Arlington, but points west and north will likely see snow, sleet and freezing rain.

Along I-81 and the Blue Ridge, the storm is expected to be a high-impact event, and travel on Thursday is “not advised,” VDOT says.

More from a VDOT press release, below.

The Virginia Department of Transportation (VDOT) is advising motorists traveling in and through Virginia to adjust their holiday travel ahead of winter weather expected in parts of the Commonwealth beginning Wednesday night and continuing through Friday.

Travelers are advised to shift holiday travel to Wednesday if possible. Travel on Thursday is not advised, especially through the western regions of Virginia along the Interstate 81 corridor, to avoid potentially hazardous conditions created by forecasted winter weather.

According to current forecasts, wintry precipitation is expected to arrive as soon as 11 p.m. on Wednesday, Dec. 21 in the southwestern regions of the state, and move northward through the western third of the state, and into portions of northern Virginia through Thursday. Periods of heavy snow are expected along the northern sections of I-81 and the mountain passes including Interstate 64 over Afton Mountain and Rt. 33 between Standardsville and Harrisonburg early Thursday. Temperatures are expected to drop rapidly through the day on Friday leading to the potential for refreeze in areas where the pavement remains wet.

VDOT crews are pretreating roadways and interstates today in anticipation of the weather event.

With extreme low temperatures expected to move in Friday, motorists, if traveling, should pack an emergency kit and blankets, and have mobile devices fully charged in the event of a breakdown or emergency.

“Please continue to monitor forecasts closely as forecasts can improve or worsen quickly,” VDOT said in a separate advisory. “Drivers should expect roads to be impacted Thursday and Friday… Treat anything that looks wet as if it could be icy, especially bridges, ramps, overpasses, and elevated surfaces. If there is snow or ice on roadways, travel is hazardous.”

The transportation agency is currently pretreating roads and “will begin deploying trucks early Thursday morning to treat roads as needed.”

“Adjust travel plans and avoid all nonessential travel during the height of the storm,” VDOT said “This helps to avoid deteriorating conditions and to allow crews room to work.”

A Flood Watch, meanwhile, has been issued for the D.C. area ahead of the rain.

322 PM EST Wed Dec 21 2022

…FLOOD WATCH IN EFFECT FROM THURSDAY MORNING THROUGH LATE THURSDAY NIGHT…

* WHAT…Flooding caused by excessive rainfall is possible.

* WHERE…DC and portions of Maryland and northern Virginia, including the following areas: District of Columbia. In Maryland, Anne Arundel, Cecil, Central and Southeast Howard, Central and Southeast Montgomery, Prince Georges, Southeast Harford and Southern Baltimore. In northern Virginia, Arlington/Falls Church/Alexandria, Fairfax and Prince William/Manassas/Manassas Park.

* WHEN…From Thursday morning through late Thursday night.

* IMPACTS…Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Flooding may occur in poor drainage and urban areas.

* ADDITIONAL DETAILS…
– Moderate rainfall is expected Thursday into Thursday evening, with rainfall totals of one to two inches. This may lead to isolated instances of flooding, especially in urban and poor drainage areas.
– http://www.weather.gov/safety/flood

PRECAUTIONARY/PREPAREDNESS ACTIONS…

You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.

VDOT released the following timeline of expected conditions in Northern Virginia and western zones through Christmas.

(more…)


The Water Pollution Control Plant in South Arlington (via DES/Flickr)

Your poop could give Arlington County natural gas to power buildings or buses.

The county is developing plans to upgrade its Water Pollution Control Plant, where local sewage goes. One change involves installing technology that can harness the methane emitted when human solid waste is processed, turning it into renewable natural gas, a process some municipalities have already implemented.

The energy could be used to power the wastewater plant, homes and commercial buildings or become an alternate fuel for ART buses. The “sludge” created through this process can also be used as a fertilizer for gardens, forests, farms and lawns. (If you’ve ever used Milorganite brand fertilizer, you’ve used dried sewage sludge from Milwaukee.)

How sewage can become power (via Arlington County)

Improvements to the wastewater treatment facility, to the tune of $156 million, are part of a $177 million bond request for utilities upgrades, which also includes improvements the regional Washington Aqueduct system ($15 million) and new gravity transmission mains ($3 million).

Funding for this work would come from a half-billion dollar bond referenda that voters will be considering on Election Day tomorrow (Tuesday). Over $510 million will go toward this work as well as a host of initiatives, upgrades and maintenance projects that Arlington County adopted as part of its 2023-32 Capital Improvement Plan.

Some big-ticket items have already grabbed headlines, like the $136 million requested to build a new Arlington Career Center campus and $2 million to design a proposed Arlington Boathouse on the Potomac River near Rosslyn. But there are dozens of other upgrades proposed for facilities that Arlingtonians of all ages use on a regular, and sometimes daily, basis.

Renovations to existing county buildings and the construction of new ones surpass $53 million.

Highlights include:

  • $13.1 million for various renovations to Arlington’s police headquarters and, for the county’s courts building, technology upgrades, new finishes, a redesigned entrance and a relocated Juvenile and Domestic Relations Courts division.
  • $12 million to fund the construction and renovation of some floors of 2020 14th Street N. to make room for ACFD Fire Marshal and Battalion Chiefs offices and other public safety staff and functions. It will also see the replacement of the building’s 60-year-old HVAC system.
  • $7.5 million to acquire land next to the Serrano Apartments to build a fire station there and improve response times on the west end of Columbia Pike, given the pace of development along the Pike.

Overall, Arlington Public Schools is asking for $165 million. Of that, some $12.24 million would pay for safer school entrances, a measure many school systems nationwide are implementing in the wake of high-profile shootings, and new kitchens to allow more meals to be made in-house.

“Upgraded kitchens will allow students to eat high-quality meals that include more fresh fruits and vegetables that are prepared on-site,” according to APS. “The entrance and security vestibule updates will comply with current safety and security standards while ensuring all visitors check in at the main office.”

Existing and modernized school kitchens (via APS)

Another $16.8 million would pay for a new roof for Escuela Key, the Spanish-language immersion elementary school, HVAC replacement at Hoffman-Boston Elementary School and lighting upgrades across schools.

The Arlington Dept. of Parks and Recreation is asking for nearly $22.5 million for a dozen projects.

That includes some funding $1.5 million to replace and renovate some stretches of the county’s nearly 40 miles of off-street, multi-purpose trails, 56 pedestrian bridges and 11 low-water fords.

Preschool- and school-aged kids could have new playgrounds at Bailey’s Branch, Monroe and Woodmont parks sometime in 2024 ($2.8 million). Douglas Park will see $2 million in improvements, including a new picnic shelter, pedestrian bridge, stormwater management, invasive species removal and reforestation.

Athletes who play at Kenmore Middle School could have new turf fields ($300,000).

There’s $1.1 million in funding to design new facilities at Short Bridge Park, near the border of the City of Alexandria, as well as $1.8 million to redesign Gateway Park in Rosslyn, which the budget says is “difficult and dangerous to access due to the surrounding high-speed roadways” and is “under-utilized.”

People who live in the Ballston and Virginia Square areas would be able to get in on the ground floor of master planning processes ($1.5 million) next year to upgrade Maury, Herselle Milliken and Gum Ball parks starting as early as 2025.

The second, $4.4 million phase of work on Jennie Dean Park will move forward, including demolishing the existing WETA building, two parking lots and a portion of 27th Street S., installing a lighted basketball court and converting the existing court for tennis use.

The growing pickleball population, sometimes at odds with neighbors, and the dirt trail-less mountain bike enthusiasts could get new facilities through $2 million to convert tennis courts at Walter Reed Community Center for pickleball use, draw pickleball lines on some multi-use courts and fund “design improvements to natural surface trails and mountain biking improvements.”

(more…)


A year into new stormwater requirements for single-family home projects, homebuilders and remodelers say even the improved process is laborious and expensive, costing homeowners extra money.

On the other hand, Arlington County says that permit review times have shortened and that the program will be evaluated for possible improvements.

Before September 2021, builders had to demonstrate that a given property had ways to reduce pollution in stormwater runoff to comply with state regulations aimed at cleaning up the Chesapeake Bay.

Last year, the county began requiring projects that disturb at least 2,500 square feet of land to demonstrate the redeveloped property can retain at least 3 inches of stormwater during flash flooding events through features such as tanks, planters and permeable paver driveways. Builders must also refurbish the soil with soils that increase water retention.

Arlington Dept. of Environmental Services spokesman Peter Golkin says improvements like these “are vital as we continue the work toward a flood resilient Arlington,” especially as “the pace of single family home construction in Arlington remains strong.”

But the regulations are fairly new and could change, Golkin said.

“The first projects in LDA 2.0 are now coming to construction, and the County is entering the phase of evaluation to identify potential adjustments and improvements,” he said. ”The County expects to have more information about any LDA 2.0 updates by mid-2023.”

The updates were intended to address increasing infill development and rainfall intensity, and the downstream effects of runoff and impacts to the county’s aging storm drains and local streams.

Builders and remodelers say the changes have caused new headaches and resulted in projects shrinking in size.

“It only gets more complicated, costs more, and takes longer,” says architect Trip DeFalco.

Andrew Moore, president of Arlington Designer Homes, said he’s avoided this process in many projects after telling the clients about the potential costs and permitting time.

“People are motivated to think, do I need that bump-out to be 14 feet? I can live with 12 feet,” he said. “It saves you $50,000 and 3 months.”

Despite the hassle, permit applications are still coming in at a clip of, on average, 20 per month.

Responding to redevelopment

In the wake of the destructive July 2019 flash flood, residents has discussed and voted on ways to address stormwater mitigation in Arlington, while the county has put more funding toward stormwater improvement projects.

The issue of runoff has figured into debates about how to protect streams and the impacts of allowing the construction of two- to eight-unit “Missing Middle” houses in Arlington, though such projects could only occupy the footprint currently allowed for single-family homes on a given property.

In the wake of the flash flooding, the county introduced new regulations for what it says is one of the biggest runoff contributors: new single-family homes.

“Ensuring more robust control of runoff from new single family homes, which create the majority of new impervious area from regulated development activity, remains a top County priority as part of the comprehensive Flood Resilient Arlington initiative,” Golkin said.

An average of 167 single-family homes have been built and an average of 155 torn down annually over the last 11 years, according to Arlington’s development tracker tool. Demolitions peaked in 2015 and completed projects in 2016.

Single-family detached demolitions and completed projects (via Arlington County)

A past of pollution

DeFalco, who spent a few years as a builder, too, says the “county’s hands are a little bit tied” on this issue because they have to meet state requirements aimed at curbing pollution in the Chesapeake Bay.

Runoff brought fertilizer into the bay, causing algae and plants to grow quickly and then die, sink to the bottom, where they decayed and used up oxygen, says civil engineer Roger Bohr.

“The state is pushing on the county and the federal government is pushing on the state,” DeFalco said. “But the implementation on the homeowner level is pretty onerous… I don’t think the residents have any idea what’s going in their side yards.”

Golkin compared the transition period right now to when new state stormwater management requirements took effect in 2014.

“Staff and the building and engineering community ultimately came up to speed,” he said.

(more…)


Lightning strikes in the distance on a stormy night in Ballston, looking south along Glebe Road in August 2022 (staff photo by Jay Westcott)

Arlington, Alexandria, D.C. and other parts of the Washington region could see strong storms and pockets of flooding.

A Flood Watch has been issued for much of the area and is set to take effect at 5 p.m.

Forecasters say istorms will likely arrive later this afternoon and may pack heavy rainfall and, in more isolated instances, damaging wind gusts. A “brief tornado” is also possible.

More from the National Weather Service:

1049 AM EDT MON SEP 12 2022

…FLOOD WATCH REMAINS IN EFFECT FROM 5 PM EDT THIS AFTERNOON THROUGH THIS EVENING…

* WHAT…FLASH FLOODING CAUSED BY EXCESSIVE RAINFALL CONTINUES TO BE POSSIBLE. […]

* WHEN…FROM 5 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…
– SHOWERS AND THUNDERSTORMS ARE EXPECTED THIS AFTERNOON INTO THE EVENING AS A COLD FRONT PUSHES THROUGH THE AREA. HEAVY RAINFALL RATES COULD PRODUCE LOCALIZED RAINFALL AMOUNTS OF 2 TO 3 INCHES IN A SHORT PERIOD OF TIME.
– HTTP://WWW.WEATHER.GOV/SAFETY/FLOOD

PRECAUTIONARY/PREPAREDNESS ACTIONS…

YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED.


The storm as of 5 p.m.

Update at 5:20 p.m. — Dominion is currently reporting 775 customers without power in Arlington, mostly in the Boulevard Manor, Arlington Forest, Douglas Park and Ashton Heights neighborhoods. It appears that Alexandria bore the brunt of the storm, with nearly 7,000 outages in the city, according to the power company. 

The National Weather Service reported a 41 mph wind gust at Reagan National Airport during the height of the storm, around 4:30 p.m.

Update at 5 p.m. — A new Flash Flood Warning has been issued for most of Arlington until 8 p.m.

From NWS:

BULLETIN – EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
457 PM EDT WED AUG 10 2022

THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A

* FLASH FLOOD WARNING […]

* UNTIL 800 PM EDT.

* AT 457 PM EDT, DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING HEAVY RAIN ACROSS THE WARNED AREA. BETWEEN 1.5 AND 2.5 INCHES OF RAIN HAVE FALLEN. ADDITIONAL RAINFALL AMOUNTS OF 0.5 TO 1.5 INCHES ARE POSSIBLE IN THE WARNED AREA. FLASH FLOODING IS ONGOING OR EXPECTED TO BEGIN SHORTLY.

HAZARD…FLASH FLOODING CAUSED BY THUNDERSTORMS.

SOURCE…RADAR.

IMPACT…FLASH FLOODING OF SMALL CREEKS AND STREAMS, URBAN AREAS, HIGHWAYS, STREETS AND UNDERPASSES AS WELL AS OTHER POOR DRAINAGE AND LOW-LYING AREAS.

* SOME LOCATIONS THAT WILL EXPERIENCE FLASH FLOODING INCLUDE… ARLINGTON… ALEXANDRIA… BETHESDA… COLLEGE PARK… LANGLEY PARK… FALLS CHURCH… CORAL HILLS… BLADENSBURG… HOWARD UNIVERSITY… FORT TOTTEN… GALLAUDET UNIVERSITY… ROSSLYN… NATIONALS PARK… CRYSTAL CITY… RFK STADIUM… REAGAN NATIONAL AIRPORT… UNIVERSITY OF MARYLAND… LANDOVER… HYATTSVILLE… TAKOMA PARK…

PRECAUTIONARY/PREPAREDNESS ACTIONS…

TURN AROUND, DON’T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD DEATHS OCCUR IN VEHICLES.

BASEMENT FLOODING CAN OCCUR QUICKLY AND CREATE A LIFE-THREATENING SITUATION. IF YOU ARE IN A BASEMENT, OR A RESIDENCE BELOW STREET LEVEL, MOVE TO A HIGHER FLOOR IMMEDIATELY.

Earlier: Much of Arlington is currently under a Severe Thunderstorm Warning.

Two separate storm warnings have been issued for northern and southern portions of the county, plus a Flash Flood Warning for Alexandria and southern portions of Arlington.

One passenger on a departing flight that’s holding on the tarmac at Reagan National Airport said the storm there is causing the plane to shake. The airport is currently under a ground stop and experiencing 30-45 minute flight delays, according to the FAA.

More from the National Weather Service:

BULLETIN – IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Baltimore MD/Washington DC
428 PM EDT Wed Aug 10 2022

The National Weather Service in Sterling Virginia has issued a

* Severe Thunderstorm Warning for… The northwestern District of Columbia… Southeastern Montgomery County in central Maryland… Northwestern Arlington County in northern Virginia… Northeastern Fairfax County in northern Virginia…

* Until 515 PM EDT.

* At 428 PM EDT, a severe thunderstorm was located over North Bethesda, or over Rockville, and is nearly stationary.

HAZARD…60 mph wind gusts.

SOURCE…Radar indicated.

IMPACT…Damaging winds will cause some trees and large branches to fall. This could injure those outdoors, as well as damage homes and vehicles. Roadways may become blocked by downed trees. Localized power outages are possible. Unsecured light objects may become projectiles.

* Locations impacted include… Arlington, Rockville, Bethesda, Olney, Pimmit Hills, Mclean, Howard University, American Legion Bridge, Fort Totten, Aspen Hill, Potomac, North Bethesda, North Potomac, Fairland, Tysons Corner, White Oak, Redland, Takoma Park, Great Falls and Colesville.

PRECAUTIONARY/PREPAREDNESS ACTIONS…

For your protection move to an interior room on the lowest floor of a building.


Storms approaching Arlington from the west

Update at 10:20 p.m. — Portions of northern Arlington County are now under a Flash Flood Warning after an extended period of heavy rain.

From the National Weather Service:

BULLETIN – EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Baltimore MD/Washington DC
1016 PM EDT Thu Aug 4 2022

The National Weather Service in Sterling Virginia has issued a

* Flash Flood Warning for… District of Columbia… South Central Montgomery County in central Maryland… West Central Prince Georges County in central Maryland… Northern Arlington County in northern Virginia…

* Until 115 AM EDT.

* At 1016 PM EDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Between 1 and 2 inches of rain have fallen. Additional rainfall amounts of 0.5 to 1.5 inches are possible in the warned area. Flash flooding is ongoing or expected to begin shortly.

HAZARD…Flash flooding caused by thunderstorms.

SOURCE…Radar.

IMPACT…Flash flooding of small creeks and streams, urban areas, highways, streets and underpasses as well as other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include… Arlington… Bethesda… Falls Church… Howard University… Fort Totten… Rosslyn… Gallaudet University… RFK Stadium… Hyattsville… Takoma Park… Chevy Chase… Martin`s Additions…
Adams Morgan… Georgetown… American University… US Capitol… Friendship Village… Kenilworth… Silver Spring… Chillum…

PRECAUTIONARY/PREPAREDNESS ACTIONS…

Turn around, don’t drown when encountering flooded roads. Most flood deaths occur in vehicles.

Earlier: A Severe Thunderstorm Warning was just issued for Arlington.

A storm approaching the area from the west is packing strong winds and torrential rain, forecaster say.

More from the National Weather Service:

BULLETIN – IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Baltimore MD/Washington DC
628 PM EDT Thu Aug 4 2022

The National Weather Service in Sterling Virginia has issued a

* Severe Thunderstorm Warning…

* Until 715 PM EDT.

* At 627 PM EDT, a severe thunderstorm was located over Annandale, moving east at 10 mph.

HAZARD…60 mph wind gusts and quarter size hail.

SOURCE…Radar indicated.

IMPACT…Damaging winds will cause some trees and large branches to fall. This could injure those outdoors, as well as damage homes and vehicles. Roadways may become blocked by downed trees. Localized power outages are possible. Unsecured light objects may become projectiles.

* Locations impacted include… Arlington, Alexandria, Bethesda, Bowie, Annandale, Clinton, Springfield, College Park, Fort Washington, Greenbelt, Fairfax, Langley Park, Beltsville, Fort Hunt, Vienna, Groveton, Forestville, Falls Church, Huntington and Largo.


Boundaries of Severe Thunderstorm Watch on 7/25/22 (via National Weather Service)

Update at 3:50 p.m. — A Severe Thunderstorm Warning has been issued for the far northern tip of Arlington.

Earlier: Arlington, D.C. and most of the region is now under a Severe Thunderstorm Watch.

The watch, which was issued around 1:45 p.m., is in effect until 10 p.m.

Forecasters say storms packing damaging winds and heavy downpours are possible this afternoon and evening. More from NWS:

Thunderstorms will further develop and intensify initially near/just of the mountains, and subsequently spread eastward toward the I-95 corridor through late afternoon and early evening. Damaging winds are the primary hazard.

Local authorities, meanwhile, are encouraging residents to prepare for the possibility of severe weather.

Some of the tips include charging essential devices and securing loose items from lawns and balconies.

https://twitter.com/ArlingtonVaFD/status/1551631655596544000


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