Updated at 4:25 p.m. — A Severe Thunderstorm Warning has now been issued for Fairfax County. In effect until 5 p.m., storms are moving east at 15 miles per hour with 60 mile-per-hour wind gusts that could bring down trees and large branches, potentially leading to power outages.

Earlier: While the Reston area largely got through last night’s thunderstorm unscathed, Fairfax County is already bracing for another potentially damaging storm.

The National Weather Service has put the entire D.C. region under a Severe Thunderstorm Watch until 9 p.m., warning of the potential for hail and damaging winds similar to the blasts that disrupted travel and power in the Vienna and Falls Church area yesterday (Tuesday).

A Severe Thunderstorm Watch has been issued until 9 PM this evening for all areas east of the Allegheny Front. Damaging winds and large hail will be the primary threat for these storms. pic.twitter.com/CXqq3C1nP4

— NWS Baltimore-Washington (@NWS_BaltWash) August 11, 2021

[8/11 at 2:15 PM] ⚠️A Severe Thunderstorm Watch is in effect until 9 PM tonight. Potential hazards from these storms include: damaging wind gusts, hail, lightning, and isolated flash flooding. Be prepared to move indoors and know what to do if a warning is issued. #VaWx #BeReady pic.twitter.com/4nGV078aXl

— Ready Fairfax (@ReadyFairfax) August 11, 2021

In addition, a Heat Advisory will remain in effect until 8 p.m. today with an Excessive Heat Watch scheduled to begin at noon tomorrow (Thursday), when the heat index could reach up to 105 degrees Fahrenheit.

Updated at 3:45 p.m. — A Flash Flood Warning has been issued for Fairfax County until 6:30 p.m.

Updated at 2:45 p.m. — The Severe Thunderstorm Warning has now been extended to 3:30 p.m. for Fairfax County, including Reston.

Earlier: A Severe Thunderstorm Watch has been issued for Fairfax County and the rest of the D.C. area, joining a Flash Flood Watch that will take effect at 2 p.m. today (Thursday).

The thunderstorm watch took effect at 12:40 p.m. and will remain in place until 8 p.m., according to the National Weather Service.

A Severe Thunderstorm Warning has also been issued for the northeastern part of the county, including Reston and Herndon. That will be in effect until 1:45 p.m.

The Severe Thunderstorm Warning from the NWS says:

* At 103 PM EDT, a severe thunderstorm was located over Ashburn, or near Broadlands, moving east at 25 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…
Rockville, Bethesda, Gaithersburg, Reston, Olney, Herndon, Broadlands, Lansdowne, Lowes Island, Brambleton, American Legion Bridge, Aspen Hill, Potomac, North Bethesda, Ashburn, Sterling, North Potomac, Redland, Wolf Trap and Great Falls.

“For your protection move to an interior room on the lowest floor of a building,” the NWS advises.

https://twitter.com/ReadyFairfax/status/1410646981861597186

A Severe Thunderstorm Watch has been issued for parts of DE, DC, MD, NJ, PA, VA until 8 PM EDT. #MDwx #VAwx #DCwx pic.twitter.com/2sf7WdTrtE

— NWS Baltimore-Washington (@NWS_BaltWash) July 1, 2021

More than 5,000 people in northern Fairfax County are currently without power, as a thunderstorm pummels the D.C. area.

According to Dominion Energy’s outage map, the largest outages are concentrated north of Tysons and in the east Reston and Great Falls area, which is currently experiencing three separate outages in the wake of the storm that started pouring rain earlier this evening (Thursday).

The most significant swath starts south of the Dulles Toll Road and extends all the way up into Great Falls past Riverbend Park, encompassing 2,806 people who have lost power due to a circuit outage, according to Dominion. A crew has been dispatched, but as of publication, there is no estimated time of restoration yet.

Another outage affecting 1,786 customers around Colvin Run and Lake Fairfax was also caused by a lost circuit with an estimated time of restoration pending investigation.

Finally, 687 people have lost power around Difficult Run Stream Valley Park. The cause and estimated time of restoration are both pending investigation.

In a Severe Thunderstorm Warning issued at 8:21 p.m., the National Weather Service advised residents to move indoors to the lowest part of their residence.

“Large hail and damaging winds and continuous cloud to ground lightning is occurring with these storms. Move indoors immediately,” the NWS said. “Lightning is one of nature’s leading killers. Remember, if you can hear thunder, you are close enough to be struck by lightning.”

840p: Thjs line of storms from Baltimore to DC to Manassas really blossomed beyond expectations. Forecasting storms keep you humble. pic.twitter.com/sz9zKxFeZ8

— Capital Weather Gang (@capitalweather) May 27, 2021

Image via Dominion Energy

Fairfax County and other areas in Northern Virginia have been put under a Severe Thunderstorm Warning on top of a Severe Thunderstorm Watch that will be in effect until 10 p.m.

Here is the full alert from the National Weather Service, which is scheduled to last until 4:45 p.m.:

At 405 PM EDT, a severe thunderstorm was located near Warrenton, moving northeast at 30 mph.

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…
Centreville, Reston, Annandale, South Riding, Herndon, Fairfax, Mantua, Dulles International Airport, Burke, Linton Hall, Oakton, Sterling, Chantilly, Merrifield, Bull Run, Haymarket, Arcola, Manassas, Sudley and Manassas Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS…

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

A severe thunderstorm warning is in effect for Fairfax County. The National Weather Service issued the alert until 4 p.m. today.

A flash flood warning is also in effect until 6:30 p.m. today.

Here’s more from the alert:

HAZARD…Scattered damaging wind gusts up to 60 mph and isolated
hail up to quarter size.

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.

Residents are encouraged to stay indoors and seek shelter.

https://twitter.com/fairfaxcounty/status/1286012617404882944?s=21

A severe thunderstorm warning is in effect for Reston and Herndon until 4:15 pm today.

The National Weather Service urges residents to take shelter or stay in the lowest area of a building.

Here’s more from the alert:

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.

A severe thunderstorm warning is in effect for the area until around 9:45 p.m. today (Thursday).

The National Weather Service says damaging winds could cause damage to trees. A tornado watch also remains in effect until midnight.

Here’s more from the alert:

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.

In the event of a tornado, residents are encouraged to move to an interior room on the lowest floor of a building.

Severe Thunderstorm Warning including Centreville VA, Bethesda MD, Reston VA until 9:45 PM EDT pic.twitter.com/Yd3T39tjEM

— NWS DC/Baltimore (@NWS_BaltWash) November 1, 2019

Reston is under a several thunderstorm warning until 11:15 p.m. today (Monday).

The National Weather Service issued the alert, which says to expect wind gusts of up to 60 miles per hour and quarter size hail.

Here’s more from the alert:

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… Reston, Herndon, Fairfax, Vienna, Lowes Island, Mantua, Potomac, Oakton, Sterling, Chantilly, Tysons Corner, Wolf Trap, Great Falls, Merrifield, Countryside, Dunn Loring, Darnestown, Belleview,

Bradley Farms and Sterling Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS…

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

Photo via NWS/Twitter

A flood warning is in effect for Reston and parts of Northern Virginia until 6:45 p.m. today (Thursday).

The National Weather Service says that thunderstorms and heavy rain are likely to cause flooding. More than two inches of rain have already fallen in the region.

Earlier this afternoon, NWS also issued a severe thunderstorm warning, which stated that damaging winds are expected to cause damage to trees. Localized power outages are also likely.

Hail and wind gusts of up to 60 miles per hour are expected.

Here’s more from the alert:

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… Reston, South Riding, Herndon, Broadlands, Lowes Island, Brambleton, Dulles International Airport, Ashburn, Sterling, Chantilly, Great Falls, Countryside, Arcola, Belmont, Gleedsville and Sterling Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS…

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

Severe Thunderstorm Warning including Ashburn VA, Sterling VA, South Riding VA until 3:30 PM EDT pic.twitter.com/0wkWMqlwh7

— NWS DC/Baltimore (@NWS_BaltWash) August 15, 2019

Reston is under a thunderstorm watch until around 2:45 p.m. today (Wednesday).

The National Weather Service encourages residents to move to an interior room in the lowest floor of a building.

Here’s more from the alert:

At 157 PM EDT, a severe thunderstorm was located over Great Falls, or over Lowes Island, moving northeast at 25 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.

Photo by Ed Schudel

A portion of Reston is now under a Severe Thunderstorm Warning as strong storms approach from the west.

Forecasters say wind up to 60 miles per hour, as well as penny-sized hail, is possible as a result of the storm.

More from the National Weather Service:

BULLETIN – IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
448 PM EDT WED JUL 17 2019

THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR…
SOUTHEASTERN LOUDOUN COUNTY IN NORTHERN VIRGINIA…
THE CITY OF FAIRFAX IN NORTHERN VIRGINIA…
NORTHWESTERN FAIRFAX COUNTY IN NORTHERN VIRGINIA…
EAST CENTRAL FAUQUIER COUNTY IN NORTHERN VIRGINIA…
THE CITY OF MANASSAS PARK IN NORTHERN VIRGINIA…
NORTHWESTERN PRINCE WILLIAM COUNTY IN NORTHERN VIRGINIA…
THE CITY OF MANASSAS IN NORTHERN VIRGINIA…

* UNTIL 530 PM EDT.

* AT 448 PM EDT, A SEVERE THUNDERSTORM WAS LOCATED NEAR HAYMARKET, OR 7 MILES SOUTHWEST OF SOUTH RIDING, MOVING NORTHEAST AT 35 MPH.

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… CENTREVILLE, RESTON, ANNANDALE, SOUTH RIDING, HERNDON, FAIRFAX, VIENNA, MANTUA, DULLES INTERNATIONAL AIRPORT, LINTON HALL, OAKTON, CHANTILLY, TYSONS CORNER, WOLF TRAP, GREAT FALLS, MERRIFIELD, BULL RUN, HAYMARKET, ARCOLA AND I66 AND I495 INTERCHANGE.

PRECAUTIONARY/PREPAREDNESS ACTIONS…

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

Severe Thunderstorm Warning including Centreville VA, Reston VA, Manassas VA until 5:30 PM EDT pic.twitter.com/1h60gDvfTo

— NWS DC/Baltimore (@NWS_BaltWash) July 17, 2019

A severe thunderstorm warning is in effect until 5:30 p.m. today (Thursday).

The National Weather Service encourages residents to take shelter as soon as possible.

Here’s more from the alert:

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.

The warning covers Reston, Herndon, Oakton, Chantilly, Wolf Trap and Great Falls.

Severe Thunderstorm Warning including Reston VA, Herndon VA, Chantilly VA until 5:30 PM EDT pic.twitter.com/QY2Jaq31bV

— NWS DC/Baltimore (@NWS_BaltWash) June 27, 2019

The National Weather Service has issued a severe thunderstorm warning that is in effect until 4 p.m. today (Thursday).

Winds of up to 60 miles per hour and hail damage trees, may cause large branches to fall, and result in widespread power outages.

NWS encourages residents to move into an inside room on the lowest floor possible.

The warning covers most of Northern Virginia.

Photo via NWS/Twitter