Tropical Storm Isaias moved up the east coast, passing through southern Maryland on the morning of Tuesday, August 4th, 2020, spawning several tornadoes as well as flooding rain and tropical storm force winds.
Storm total rainfall ranged from 2 to 4 inches near Interstate 95 to as much as 9 inches in Calvert County east of Interstate 95. The heavy rain led to numerous incidents of flooding and flash flooding, especially near and east of Interstate 95.
The highest sustained wind of 46 knots was reported at Bishops Head and the highest peak gust of 63 knots was also reported at Bishops Head.
There were three tornadoes associated with Isaias over southern Maryland and there were also numerous reports of downed trees from tropical storm force winds, especially near and east of Interstate 95.
A storm surge of 1 to 2 feet occurred along the western shore of the Chesapeake Bay and the shore of the Tidal Potomac River. This did result in minor tidal Flooding in Washington DC.

Flood in FAIRFAX, VIRGINIA
From 04-AUG-20 08:06:00 to 04-AUG-20 15:27:00 (EST-5)
Location: CROWELLS CORNER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The stream gage on Difficult Run at Wolf Trap exceeded the 195 foot flood stage during the indicated period. Six inches of water covered Browns Mill Rd at its lowest point. The peak level of 195.90 feet occurred at 12:25 PM.

Tropical Storm in SPOTSYLVANIA, VIRGINIA
From 04-AUG-20 05:00:00 to 04-AUG-20 11:00:00 (EST-5)
Property damage: 10.00K
Reported by: 911 Call Center

The Spotsylvania County 911 Center received 16 calls for trees, wires, and branches down.

Tropical Storm in KING GEORGE, VIRGINIA
From 04-AUG-20 05:00:00 to 04-AUG-20 11:00:00 (EST-5)
Property damage: 500.00K
Reported by: 911 Call Center

The King George County 911 Center received nearly three dozen calls for trees, wires, and branches down. A tree also fell onto a house.

Tropical Storm in STAFFORD, VIRGINIA
From 04-AUG-20 05:00:00 to 04-AUG-20 11:00:00 (EST-5)
Property damage: 8.00K
Reported by: 911 Call Center

The Stafford County 911 Center received 11 calls for trees, wires, and branches down.

Tropical Storm in PRINCE WILLIAM, VIRGINIA
From 04-AUG-20 05:00:00 to 04-AUG-20 11:00:00 (EST-5)
Property damage: 4.00K
Reported by: 911 Call Center

The Prince William County 911 Center received 4 calls for downed trees.

Tropical Storm in FAIRFAX, VIRGINIA
From 04-AUG-20 05:00:00 to 04-AUG-20 11:00:00 (EST-5)
Property damage: 15.00K
Reported by: Department of Highways

The Fairfax County Police and Virginia Department of Transportation reported about a couple dozen trees down, mostly east and south of the Fairfax County Parkway.

Tropical Storm in ARLINGTON, VIRGINIA
From 04-AUG-20 05:00:00 to 04-AUG-20 11:00:00 (EST-5)
Property damage: 5.00K
Reported by: Fire Department/Rescue

The Alexandria Police and Fire Departments received eight calls for trees and wires down.

Flood in SPOTSYLVANIA, VIRGINIA
From 04-AUG-20 06:57:00 to 04-AUG-20 08:57:00 (EST-5)
Location: BROCKROAD
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Stewart Rd. closed due to flooding.

Flood in KING GEORGE, VIRGINIA
From 04-AUG-20 08:30:00 to 04-AUG-20 10:30:00 (EST-5)
Location: KING GEORGE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Multiple reports of flooding in King George County, resulting in road closures.

Flood in FAIRFAX, VIRGINIA
From 04-AUG-20 11:10:00 to 04-AUG-20 13:10:00 (EST-5)
Location: BURKE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Burke Rd. closed due to high water near Liberty Bell Ct.

Flood in FAIRFAX, VIRGINIA
From 04-AUG-20 11:10:00 to 04-AUG-20 13:10:00 (EST-5)
Location: KENMORE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Old Courthouse Rd. closed due to high water at Besley Rd.

Flood in FAIRFAX, VIRGINIA
From 04-AUG-20 13:21:00 to 04-AUG-20 15:21:00 (EST-5)
Location: CROWELLS CORNER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Browns Mill Rd. closed due to flooding near Crowell Rd.

Flood in FAIRFAX, VIRGINIA
From 04-AUG-20 07:10:00 to 04-AUG-20 10:40:00 (EST-5)
Location: BURNLEYS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The stream gage on the Accotink Creek at Strathmeade Spring exceeded the 251.5 foot flood stage during the indicated period. Both Woodburn Rd. and Prosperity Ave. became flooded by at least 6 inches of water. The peak level of 252.48 feet occurred at 8:30 AM.