A lee pressure trough ignited thunderstorms in a strongly unstable environment. The strongest thunderstorms produced severe downbursts and sporadic hail.

Thunderstorm Wind in MONTGOMERY, MARYLAND
From 10-AUG-21 15:40:00 to 10-AUG-21 15:40:00 (EST-5)
Location: SENECA
Magnitude: 50.00 EG
Property damage: 1.00K
Reported by: Emergency Manager

Wires blew down near the intersection of Montevideo Road and River Road.

Thunderstorm Wind in MONTGOMERY, MARYLAND
From 10-AUG-21 15:52:00 to 10-AUG-21 15:52:00 (EST-5)
Location: QUINCE ORCHARD
Magnitude: 50.00 EG
Property damage: 3.00K
Reported by: Emergency Manager

Wires blew down near the intersection of Jones Lane and Quail Run Drive. A tree blew down onto wires in the 12900 block of Riffle Ford Court.

Thunderstorm Wind in FREDERICK, MARYLAND
From 10-AUG-21 16:03:00 to 10-AUG-21 16:03:00 (EST-5)
Location: ROSEMONT
Magnitude: 50.00 EG
Property damage: 3.00K
Reported by: Department of Highways

Several trees blew down in the southwestern corner of Frederick County near Rosemont. A tree blew down on US-340 near MD-17. A tree blew down on MD-17 at Lees Road. A tree blew down on US-15 near mile marker 7.

Thunderstorm Wind in MONTGOMERY, MARYLAND
From 10-AUG-21 16:15:00 to 10-AUG-21 16:15:00 (EST-5)
Location: REDLAND
Magnitude: 50.00 EG
Property damage: 1.00K
Reported by: Department of Highways

A tree blew down on MD-200 near the Mill Run overpass.

Thunderstorm Wind in MONTGOMERY, MARYLAND
From 10-AUG-21 16:15:00 to 10-AUG-21 16:15:00 (EST-5)
Location: HYATTSTOWN
Magnitude: 50.00 EG
Property damage: 2.00K
Reported by: Emergency Manager

Wires blew down in the 24600 block of MD-355 Frederick Road. A tree blew down on I-270 Washington National Pike/Dwight D. Eisenhower Highway near Comus Road.

Lightning in MONTGOMERY, MARYLAND
From 10-AUG-21 16:15:00 to 10-AUG-21 16:15:00 (EST-5)
Location: GERMANTOWN
Property damage: 2500.00K
Reported by: Emergency Manager

Lightning struck a 3-story apartment building in the 13100 block of Millhaven Place. The lightning strike started a severe fire that started in the attic and caused the building to collapse, displacing a dozen families and causing an estimated 2.5 million dollars in damage.

Thunderstorm Wind in MONTGOMERY, MARYLAND
From 10-AUG-21 16:42:00 to 10-AUG-21 16:42:00 (EST-5)
Location: CLAGGETTSVILLE
Magnitude: 50.00 EG
Property damage: 1.00K
Reported by: Department of Highways

A tree blew down on MD-80 Fingerboard Road near Bartholows Road.

Thunderstorm Wind in MONTGOMERY, MARYLAND
From 10-AUG-21 16:56:00 to 10-AUG-21 16:56:00 (EST-5)
Location: NEELSVILLE
Magnitude: 57.00 MG
Reported by: Mesonet

A wind gust of 57 knots (66 MPH) was measured by a mesonet near Germantown.

Thunderstorm Wind in CARROLL, MARYLAND
From 10-AUG-21 17:10:00 to 10-AUG-21 17:10:00 (EST-5)
Location: MEDFORD
Magnitude: 55.00 EG
Property damage: 12.00K
Reported by: 911 Call Center

Multiple trees blew down near the intersection of MD-31 New Windsor Road and Medford Road. Numerous trees blew down near the intersection of Adams Mill Road and Bell Road. A shutter blew off a house near Wagners Mill.

Thunderstorm Wind in CARROLL, MARYLAND
From 10-AUG-21 17:15:00 to 10-AUG-21 17:15:00 (EST-5)
Location: WESTMINSTER
Magnitude: 50.00 EG
Property damage: 4.00K
Reported by: 911 Call Center

Multiple trees and wires blew down in the 400 block of Uniontown Road.

Thunderstorm Wind in BALTIMORE, MARYLAND
From 10-AUG-21 17:30:00 to 10-AUG-21 17:30:00 (EST-5)
Location: ECCLESTON
Magnitude: 55.00 EG
Property damage: 15.00K
Reported by: Emergency Manager

Trees blew down on I-695 Baltimore Beltway Inner Loop at Exit 22/Greenspring Avenue. About a dozen other trees, branches and wires were reported blown down between Pikesville and Towson.

Thunderstorm Wind in ANNE ARUNDEL, MARYLAND
From 10-AUG-21 17:52:00 to 10-AUG-21 17:52:00 (EST-5)
Location: HARWOOD
Magnitude: 50.00 EG
Property damage: 2.00K
Reported by: 911 Call Center

Multiple trees blew down near the intersection of Harwood Road and Lankford Road.

Lightning in MONTGOMERY, MARYLAND
From 10-AUG-21 17:53:00 to 10-AUG-21 17:53:00 (EST-5)
Location: QUINCE ORCHARD
Property damage: 5.00K
Reported by: Fire Department/Rescue

Lightning struck a tree which fell onto a house in the 16500 block of Sioux Lane.

Thunderstorm Wind in HARFORD, MARYLAND
From 10-AUG-21 18:05:00 to 10-AUG-21 18:05:00 (EST-5)
Location: NORRISVILLE
Magnitude: 50.00 EG
Property damage: 3.00K
Reported by: 911 Call Center

Several large trees limbs blew down onto Jolly Acres Road near the Parker Conservation area.

Lightning in MONTGOMERY, MARYLAND
From 10-AUG-21 18:07:00 to 10-AUG-21 18:07:00 (EST-5)
Location: DARNESTOWN
Property damage: 10.00K
Reported by: Fire Department/Rescue

Lightning struck a house causing a fire in the 15100 block of Rollinmead Drive.

Thunderstorm Wind in CECIL, MARYLAND
From 10-AUG-21 18:40:00 to 10-AUG-21 18:40:00 (EST-5)
Location: KILBY CORNER
Magnitude: 50.00 EG
Property damage: 5.00K
Reported by: 911 Call Center

Two trees blew down on Conowingo Road near Rock Springs Road. Large branches and wires blew down on Eckman Road.

Thunderstorm Wind in ST. MARY'S, MARYLAND
From 10-AUG-21 18:40:00 to 10-AUG-21 18:40:00 (EST-5)
Location: OAKS
Magnitude: 50.00 EG
Property damage: 2.00K
Reported by: 911 Call Center

Tree limbs blew down causing wires to sag onto the road on Charlotte Hall Road near Oaks Road.

Thunderstorm Wind in CECIL, MARYLAND
From 10-AUG-21 19:00:00 to 10-AUG-21 19:00:00 (EST-5)
Location: NORTH EAST
Magnitude: 50.00 EG
Property damage: 2.00K
Reported by: 911 Call Center

Two trees blew down on Turkey Point Road in North East.