Thunderstorms with high wind, large hail, and dangerous lightning moved across Maryland between 4 PM EDT on the 10th through 2 AM EDT on the 11th.  In Allegany County, dime sized hail fell in Frostburg where winds gusted to 40 MPH. In Frederick County, a 69 MPH wind gust was recorded in Emmitsburg where 2 inches of rain fell.  Southeast of Emmitsburg, a 100x300 foot barn under construction on Dry Bridge Road collapsed.  Three workers inside the structure were injured.  Trees were downed near Rocky Ridge south of Thurmont.  A spotter just across the Washington County border near Smithsburg reported a 45 MPH wind gust and viewed a possible tornado in Frederick County 10 miles northeast of their location.  In Carroll County, several trees were felled.  A portion of a tin roof was torn off in Detour.  Three trees were downed in a campground near Double Pipe Creek.  A wind gust of 42 MPH was recorded in Westminster.  In Baltimore County, a wind gust of 48 MPH was recorded at the University of Maryland campus in Baltimore.  Four trees were downed across the western part of Baltimore. Large trees were downed in Reisterstown and Randallstown and tree limbs were downed in Owings Mills.  A total of 13,000 customers across the county lost power because of the storms.  In Harford County, lightning struck a home in Jarrettsville.  The bolt blew off the chimney and started the attic on fire resulting in $30,000 damage. In Montgomery County, golfball sized hail was reported in Germantown.  Damage was reported to a car and to shingles and siding on a townhouse. In Prince George's County, several trees were downed onto roads and cars in the Fox Run Estates neighborhood of Clinton.  In Calvert County, several trees were downed in the Olivet area.

Thunderstorm Wind in BALTIMORE, MARYLAND
From 10-JUL-01 16:15:00 to 10-JUL-01 16:24:00 (EST)
Location: COUNTYWIDE
Property damage: .5K
Reported by: LAW ENFORCEMENT

Trees were downed in Reisterstown and Randallstown.

Lightning in HARFORD, MARYLAND
From 10-JUL-01 16:02:00 to 10-JUL-01 16:02:00 (EST)
Location: JARRETTSVILLE
Property damage: 30K
Reported by: NEWSPAPER

Lightning blew off a chimney and started an attic fire.

Hail in ALLEGANY, MARYLAND
From 10-JUL-01 15:53:00 to 10-JUL-01 15:55:00 (EST)
Location: FROSTBURG
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Dime sized hail fell.

Thunderstorm Wind in CARROLL, MARYLAND
From 10-JUL-01 15:30:00 to 10-JUL-01 15:30:00 (EST)
Location: COUNTYWIDE
Property damage: 5K
Reported by: LAW ENFORCEMENT

Trees were downed and a roof was damaged.

Thunderstorm Wind in FREDERICK, MARYLAND
From 10-JUL-01 15:06:00 to 10-JUL-01 15:10:00 (EST)
Location: EMMITSBURG
Magnitude: 60 M
Reported by: LAW ENFORCEMENT

A 69 MPH wind gust was reported.  Three workers were injured when a barn under construction collapsed.

Thunderstorm Wind in BALTIMORE CITY (C), MARYLAND
From 10-JUL-01 16:27:00 to 10-JUL-01 16:27:00 (EST)
Location: WEST BALTIMORE
Property damage: 2K
Reported by: DEPT OF HIGHWAYS

Four trees were downed.

Hail in MONTGOMERY, MARYLAND
From 10-JUL-01 16:15:00 to 10-JUL-01 16:15:00 (EST)
Location: GERMANTOWN
Magnitude: 1.75 
Property damage: 5K
Reported by: EMERGENCY MANAGER

Golfball sized hail damaged a car, shingles, and siding.  The time of the event was estimated.

Thunderstorm Wind in CALVERT, MARYLAND
From 11-JUL-01 00:36:00 to 11-JUL-01 00:36:00 (EST)
Location: OLIVET
Property damage: 5K
Reported by: EMERGENCY MANAGER

Several trees were downed.

Thunderstorm Wind in PRINCE GEORGE'S, MARYLAND
From 10-JUL-01 21:00:00 to 10-JUL-01 21:00:00 (EST)
Location: CLINTON
Property damage: 5K
Reported by: TRAINED SPOTTER

Several trees were downed onto roads and cars in the Fox Run Estates neighborhood.