An upper-level trough and associated cold front moved across Maryland, northern Virginia and eastern West Virginia during the afternoon and evening of the 22nd. High humidity and instability values provided the ingredients for severe storms to develop early in the afternoon and linger into the late evening hours.

Hail in HARFORD, MARYLAND
From 22-JUN-12 17:02:00 to 22-JUN-12 17:02:00 (EST-5)
Location: MILL GREEN
Magnitude: 1.00 
Reported by: Trained Spotter

Quarter size hail fell along Ady Rd.

Thunderstorm Wind in FREDERICK, MARYLAND
From 22-JUN-12 16:38:00 to 22-JUN-12 16:38:00 (EST-5)
Location: JOHNSVILLE
Magnitude: 57.00 EG
Property damage: 0.50K
Reported by: Trained Spotter

Large tree limbs were snapped along Coppermine Rd.

Thunderstorm Wind in FREDERICK, MARYLAND
From 22-JUN-12 16:47:00 to 22-JUN-12 16:47:00 (EST-5)
Location: UNIONVILLE
Magnitude: 52.00 EG
Property damage: 0.50K
Reported by: Department of Highways

A tree was blown down across MD 31 at Coppermine Rd.  This was reported through RITIS.

Thunderstorm Wind in PRINCE GEORGE'S, MARYLAND
From 22-JUN-12 18:56:00 to 22-JUN-12 18:56:00 (EST-5)
Location: RIVERDALE
Magnitude: 57.00 EG
Property damage: 2.00K
Reported by: Trained Spotter

Several large branches about eight inches in diameter were blown down by strong thunderstorm winds.

Thunderstorm Wind in PRINCE GEORGE'S, MARYLAND
From 22-JUN-12 19:05:00 to 22-JUN-12 19:05:00 (EST-5)
Location: KETTERING
Magnitude: 50.00 MG
Crop damage: 0.00K
Reported by: Mesonet

A wind gust of 58 mph was measured in Springdale.

Thunderstorm Wind in WASHINGTON, MARYLAND
From 22-JUN-12 15:15:00 to 22-JUN-12 15:15:00 (EST-5)
Location: DOWNSVILLE
Magnitude: 57.00 EG
Property damage: 2.00K
Reported by: Public

Large tree limbs took down power lines and a transformer along Falling Waters Road.

Hail in CALVERT, MARYLAND
From 22-JUN-12 15:43:00 to 22-JUN-12 15:43:00 (EST-5)
Location: DARES BEACH
Magnitude: 1.00 
Reported by: Public

Hail fell for about 5 minutes along Goldstein Road.

Thunderstorm Wind in FREDERICK, MARYLAND
From 22-JUN-12 15:59:00 to 22-JUN-12 15:59:00 (EST-5)
Location: WOLFSVILLE
Magnitude: 52.00 EG
Property damage: 0.50K
Reported by: 911 Call Center

A tree was blown down at the intersection of Stottlemyer Road and Brandenburg Hollow Road.

Thunderstorm Wind in FREDERICK, MARYLAND
From 22-JUN-12 16:38:00 to 22-JUN-12 16:38:00 (EST-5)
Location: JOHNSVILLE
Magnitude: 70.00 EG
Property damage: 25.00K
Reported by: Emergency Manager

The roof of a large dairy barn was destroyed by a thunderstorm downburst with estimated wind of around 80 mph.  Pieces of the roof were blown downwind several hundred feet.  Many trees in the area were uprooted or damaged.

Thunderstorm Wind in CARROLL, MARYLAND
From 22-JUN-12 16:55:00 to 22-JUN-12 16:55:00 (EST-5)
Location: NEW WINDSOR
Magnitude: 57.00 EG
Property damage: 1.00K
Reported by: Public

Tree trunks were snapped 20 to 30 feet above the ground along Greenwood Church Road.

Thunderstorm Wind in CARROLL, MARYLAND
From 22-JUN-12 16:55:00 to 22-JUN-12 16:55:00 (EST-5)
Location: NEW WINDSOR
Magnitude: 57.00 EG
Property damage: 1.00K
Reported by: Public

Tree trunks were snapped along Winters Church Road.

Thunderstorm Wind in CARROLL, MARYLAND
From 22-JUN-12 16:55:00 to 22-JUN-12 16:55:00 (EST-5)
Location: MC KINSTRYS
Magnitude: 61.00 EG
Property damage: 1.50K
Reported by: Public

There was tree damage and a broken cross member on a wooden power pole from strong thunderstorm winds.

Thunderstorm Wind in CARROLL, MARYLAND
From 22-JUN-12 16:56:00 to 22-JUN-12 16:56:00 (EST-5)
Location: SAMS CREEK
Magnitude: 57.00 EG
Property damage: 0.50K
Reported by: Public

Trees were damaged along Marston Road south of New Windsor Road.

Thunderstorm Wind in CARROLL, MARYLAND
From 22-JUN-12 16:59:00 to 22-JUN-12 16:59:00 (EST-5)
Location: DENNINGS
Magnitude: 57.00 EG
Property damage: 0.50K
Reported by: Department of Highways

A 25 inch diameter tree was blown down.  This report was gathered through the RITIS system.

Thunderstorm Wind in HARFORD, MARYLAND
From 22-JUN-12 17:00:00 to 22-JUN-12 17:00:00 (EST-5)
Location: MILL GREEN
Magnitude: 52.00 EG
Property damage: 0.50K
Reported by: Emergency Manager

A tree was knocked down along Bay Road near the intersection of Heaps Road.

Thunderstorm Wind in PRINCE GEORGE'S, MARYLAND
From 22-JUN-12 18:56:00 to 22-JUN-12 18:56:00 (EST-5)
Location: QUINCY MANOR
Magnitude: 83.00 EG
Property damage: 50.00K
Reported by: NWS Employee

Extensive damage occurred to buildings and trees along Newton Street. Roof damage was sustained at an apartment building with several hundred people displaced.

Thunderstorm Wind in BALTIMORE, MARYLAND
From 22-JUN-12 17:36:00 to 22-JUN-12 17:36:00 (EST-5)
Location: REISTERSTOWN
Magnitude: 50.00 EG
Property damage: 0.50K
Reported by: COOP Observer

A 3 inch tree limb was blown down onto a porch from a measured 50 mph wind gust.

Thunderstorm Wind in MONTGOMERY, MARYLAND
From 22-JUN-12 18:45:00 to 22-JUN-12 18:45:00 (EST-5)
Location: GEORGETOWN JCT
Magnitude: 55.00 EG
Reported by: NWS Employee

An NWS Employee estimated a wind gust of 63 mph.

Thunderstorm Wind in MONTGOMERY, MARYLAND
From 22-JUN-12 18:45:00 to 22-JUN-12 18:45:00 (EST-5)
Location: TAKOMA PARK
Magnitude: 52.00 EG
Property damage: 0.50K
Reported by: CoCoRaHS

Branches were knocked down by strong thunderstorm winds.

Thunderstorm Wind in PRINCE GEORGE'S, MARYLAND
From 22-JUN-12 18:50:00 to 22-JUN-12 18:50:00 (EST-5)
Location: LANGLEY PARK
Magnitude: 57.00 EG
Property damage: 12.00K
Reported by: Park/Forest Service

About 20 trees, with the largest 15-20 inches in diameter, were ripped out of the ground.  Two walls of a concrete building near the intersection of University Blvd. and West Park Dr. were damaged.

Thunderstorm Wind in HARFORD, MARYLAND
From 22-JUN-12 17:11:00 to 22-JUN-12 17:11:00 (EST-5)
Location: DUBLIN
Magnitude: 52.00 EG
Property damage: 1.00K
Reported by: Emergency Manager

A tree was blown down onto wires near the intersection of Scarboro Road and Mill Green Road.

Hail in HARFORD, MARYLAND
From 22-JUN-12 17:13:00 to 22-JUN-12 17:13:00 (EST-5)
Location: DUBLIN
Magnitude: 1.00 
Reported by: Trained Spotter

Quarter size hail fell after starting as pea to dime size.  The hail size was measured by the spotter.

Thunderstorm Wind in HARFORD, MARYLAND
From 22-JUN-12 17:13:00 to 22-JUN-12 17:13:00 (EST-5)
Location: DUBLIN
Magnitude: 52.00 EG
Property damage: 0.50K
Reported by: Public

A large tree limb was knocked down into a driveway along Whiteford Rd. with other small and large limbs down in neighboring yards.

Thunderstorm Wind in HARFORD, MARYLAND
From 22-JUN-12 17:15:00 to 22-JUN-12 17:15:00 (EST-5)
Location: DUBLIN
Magnitude: 57.00 EG
Property damage: 0.50K
Reported by: Emergency Manager

A tree was knocked down at the intersection of MD Route 440 and Glen Cove Road.

Thunderstorm Wind in HARFORD, MARYLAND
From 22-JUN-12 17:15:00 to 22-JUN-12 17:15:00 (EST-5)
Location: POOLE
Magnitude: 52.00 EG
Property damage: 0.50K
Reported by: Emergency Manager

A tree was knocked down near the intersection of Trappe Church Road and MD Route 136.

Thunderstorm Wind in HARFORD, MARYLAND
From 22-JUN-12 17:15:00 to 22-JUN-12 17:15:00 (EST-5)
Location: BERKLEY
Magnitude: 57.00 EG
Property damage: 1.00K
Reported by: Trained Spotter

A tree was blown down across a roadway along with multiple tree limbs.

Thunderstorm Wind in HARFORD, MARYLAND
From 22-JUN-12 17:19:00 to 22-JUN-12 17:19:00 (EST-5)
Location: GLENVILLE
Magnitude: 52.00 EG
Property damage: 0.50K
Reported by: Emergency Manager

A tree was blown down near the intersection of Deths Ford Road and Glenville Road.

Thunderstorm Wind in HARFORD, MARYLAND
From 22-JUN-12 17:23:00 to 22-JUN-12 17:23:00 (EST-5)
Location: BERKLEY
Magnitude: 57.00 EG
Property damage: 0.50K
Reported by: Emergency Manager

A tree was knocked down on wires along Castleton Road.

Thunderstorm Wind in HARFORD, MARYLAND
From 22-JUN-12 17:21:00 to 22-JUN-12 17:21:00 (EST-5)
Location: BERKLEY
Magnitude: 61.00 EG
Property damage: 1.50K
Reported by: Public

Four trees were damaged and large limbs were knocked down.  A chain link fence was also damaged along with a gutter that was torn down from strong thunderstorm winds.

Thunderstorm Wind in HARFORD, MARYLAND
From 22-JUN-12 17:26:00 to 22-JUN-12 17:26:00 (EST-5)
Location: CASTLETON
Magnitude: 57.00 EG
Property damage: 0.50K
Crop damage: 0.00K
Reported by: Emergency Manager

A tree was blown down along Route 1 at the Conowingo Dam.

Thunderstorm Wind in HARFORD, MARYLAND
From 22-JUN-12 17:30:00 to 22-JUN-12 17:30:00 (EST-5)
Location: CASTLETON
Magnitude: 61.00 EG
Property damage: 1.00K
Reported by: Emergency Manager

Multiple trees were blown down and blocked the access to Camp Ramblewood.

Thunderstorm Wind in MONTGOMERY, MARYLAND
From 22-JUN-12 18:24:00 to 22-JUN-12 18:24:00 (EST-5)
Location: GLEN
Magnitude: 52.00 EG
Property damage: 1.50K
Reported by: CoCoRaHS

A large tree was blown down blocking a roadway. There were also many other trees knocked down in this vicinity.

Thunderstorm Wind in FREDERICK, MARYLAND
From 22-JUN-12 16:38:00 to 22-JUN-12 16:38:00 (EST-5)
Location: JOHNSVILLE
Magnitude: 57.00 EG
Property damage: 0.50K
Reported by: Trained Spotter

Numerous tree limbs up to 12 inches in diameter were blown down by strong thunderstorm winds.

Thunderstorm Wind in HARFORD, MARYLAND
From 22-JUN-12 17:18:00 to 22-JUN-12 17:18:00 (EST-5)
Location: DUBLIN
Magnitude: 61.00 EG
Property damage: 1.00K
Reported by: Emergency Manager

Trees were knocked down on Franklin Church Road near the intersection of Glen Cove Road.

Thunderstorm Wind in BALTIMORE, MARYLAND
From 22-JUN-12 17:30:00 to 22-JUN-12 17:30:00 (EST-5)
Location: REISTERSTOWN
Magnitude: 50.00 EG
Property damage: 2.00K
Reported by: Trained Spotter

A part of a large tree approximately two and a half feet in diameter fell onto a house along Marshall Wood Rd.

Hail in PRINCE GEORGE'S, MARYLAND
From 22-JUN-12 18:54:00 to 22-JUN-12 18:54:00 (EST-5)
Location: COLMAR MANOR
Magnitude: 1.00 
Reported by: Public

Estimated quarter size hail fell along Bladensburg Road.