A slow moving boundary combined with plenty of moisture and an unstable atmosphere led to instances of flooding and flash flooding overnight on the 14th into the early morning of the 15th.

Flash Flood in ARLINGTON, VIRGINIA
From 14-AUG-21 23:49:00 to 15-AUG-21 01:15:00 (EST-5)
Location: SOUTH WASHINGTON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

High standing water was blocking three lanes along Interstate 395 Northbound around VA 120.

Flash Flood in ALEXANDRIA (C), VIRGINIA
From 15-AUG-21 00:11:00 to 15-AUG-21 02:11:00 (EST-5)
Location: ALEXANDRIA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Prince Street was closed due to high water over the roadway.

Flash Flood in ALEXANDRIA (C), VIRGINIA
From 15-AUG-21 00:11:00 to 15-AUG-21 02:11:00 (EST-5)
Location: ALEXANDRIA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

King Street was closed due to high water over the roadway.

Flash Flood in ALEXANDRIA (C), VIRGINIA
From 15-AUG-21 00:16:00 to 15-AUG-21 01:51:00 (EST-5)
Location: POTOMAC YARD
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The water level on Cameron Run at Alexandria - Eisenhower Avenue quickly rose above flood stage, cresting at 15.03 feet at 12:55 AM EST.  Most of the lower Holmes Run Trail along Cameron Run was flooded.

Flash Flood in ALEXANDRIA (C), VIRGINIA
From 15-AUG-21 00:17:00 to 15-AUG-21 01:38:00 (EST-5)
Location: ALEXANDRIA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The water level on Backlick Run in Alexandria rapidly rose above flood stage, cresting at 9.35 feet at 12:55 AM EST.

Flash Flood in FAIRFAX, VIRGINIA
From 15-AUG-21 00:28:00 to 15-AUG-21 02:15:00 (EST-5)
Location: BELLE HAVEN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Old Richmond Highway was closed around Richmond Highway due to high water.

Flash Flood in FAIRFAX, VIRGINIA
From 15-AUG-21 00:29:00 to 15-AUG-21 02:15:00 (EST-5)
Location: BREN MAR PARK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A vehicle was stuck on the ramp from Interstate 495 to Interstate 95 North due to high water.

Flash Flood in FAIRFAX, VIRGINIA
From 15-AUG-21 00:29:00 to 15-AUG-21 02:15:00 (EST-5)
Location: BAILEYS XRDS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A vehicle was stuck in high water along Arlington Boulevard eastbound around Route 7.

Flash Flood in ALEXANDRIA (C), VIRGINIA
From 15-AUG-21 01:25:00 to 15-AUG-21 04:15:00 (EST-5)
Location: ALEXANDRIA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A building in the 600 Block of S Pickett Street was evacuated due to high water.

Flash Flood in FAIRFAX, VIRGINIA
From 15-AUG-21 02:00:00 to 15-AUG-21 04:15:00 (EST-5)
Location: NEWINGTON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

There was an extended road closure for Newington Road near Cinder Bed Road. Flash flooding of Long Branch displaced large sections of the top layer of asphalt.

Flood in PRINCE WILLIAM, VIRGINIA
From 15-AUG-21 02:15:00 to 15-AUG-21 04:15:00 (EST-5)
Location: BUCKHALL
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Signal Hill Road was closed near the 7800 Block due to high water.

Flood in PRINCE WILLIAM, VIRGINIA
From 15-AUG-21 00:45:00 to 15-AUG-21 02:45:00 (EST-5)
Location: GAINESVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Linton Hall Road at Lee Highway was closed due to high water.