During the afternoon of the 22nd, numerous showers and thunderstorms developed just east of the Appalachian Mountains and moved very slowly east across northwest and north central Maryland through the pre-dawn hours of the 23rd.  These storms contained very heavy rainfall, frequent lightning, and occasionally produced high winds and large hail.  In Allegany County, the heaviest rain fell across the southwestern portion of the county.  Several basements were flooded in Rawlings and parts of Route 220 were covered in water.  Heavy rainfall downed a tree onto a power line in Frostburg.  In Washington County, heavy downpours downed trees in the western portion of the county.  In Frederick County, nickel sized hail was reported on Route 40 west of Frederick.  In Frederick pea sized hail fell and a wind gust of 50 MPH was estimated.  Trees were downed by high winds in the Putman Road area 5 miles north-northwest of Frederick.  Pea sized hail was reported in Poolesville.  A spotter in Braddock Heights reported 2 inches of rainfall in 20 minutes.  At Point of Rocks, the railroad crossing on Route 28 was flooded.  A three story mansion was struck by lightning and the resulting fire caused $300,000 damage.  Another lightning fire in Kemptown caused $20,000 damage.  In Carroll County, some roads and low lying area were flooded in the Westminster and Melrose areas.  Rainfall totals included 4.05 inches in Manchester and 2.41 inches in Westminster.  Gunpowder River overflowed west of Linesboro.  Rushing water downed power lines in the northern part of the county.  Lightning started a garage on fire and $70,000 damage was reported.  In Montgomery County, heavy rainfall caused roads to flood so quickly that three people had to be rescued from their cars.  The hardest hit areas were in the vicinity of Olney, Wheaton, and Brighton Dam.  Numerous roads had to be closed until the water subsided including Brighton Dam Road, Emory Lane, Muncaster Mill Road, Route 97, and West Willow Road.  Route 97 was closed after the Hawlings River overflowed just north of Brookville.  Rainfall totals included 5.00 inches in Brookville, 4.72 inches in Olney, 4.67 inches in Aspen Hill, 4.00 inches at Brighton Dam, 3.27 inches in Layhill, 2.68 inches in Potomac, and 2.46 inches in Bethesda.  In Poolesville, a man was burned on his face as he tried to put out a lightning fire in a three story mansion.  A garage with several vintage cars also caught fire after lightning hit the structure.  In Howard County, high water closed Brighton Dam Road, Guilford Drive, Route 108, Route 216, Sheppards Lane, Green Bridge Road, Woodstream Drive, Old Frederick Road, Carrs Mill Road, Bethany Lane, Cedar Lane, Route 29, and Old Columbia Road.  North Trotter Road was washed out by the Middle Patuxent River.  Several people had to be rescued from their vehicles after roads quickly flooded.  A mudslide closed Marriottsville Road in Ellicott City.  Rainfall reports included an estimate of 5 inches just northeast of Clarkesville, 4.10 inches in Clarkesville, and 3.30 inches in Cooksville. In Harford County, heavy rain fell mainly across the far eastern portion of the county.  Up to 7 inches of rainfall was reported at the Conowingo Dam on the Susquehanna River.  Minor flooding was reported near Havre de Grace.

Hail in FREDERICK, MARYLAND
From 22-JUN-01 15:25:00 to 22-JUN-01 15:25:00 (EST)
Location: FREDERICK
Magnitude: 0.88 
Reported by: TRAINED SPOTTER

Nickel sized hail fell.

Flash Flood in ALLEGANY, MARYLAND
From 22-JUN-01 16:30:00 to 22-JUN-01 18:30:00 (EST)
Location: SOUTHWEST PORTION
Reported by: LAW ENFORCEMENT

Flooding was reported in Rawlings and on Route 220.

Lightning in FREDERICK, MARYLAND
From 22-JUN-01 17:15:00 to 22-JUN-01 17:15:00 (EST)
Location: KEMPTOWN
Property damage: 20K
Reported by: NEWSPAPER

A piano shop was damaged by a lightning fire.

Lightning in MONTGOMERY, MARYLAND
From 22-JUN-01 18:00:00 to 22-JUN-01 18:00:00 (EST)
Location: POOLESVILLE
Property damage: 120K
Reported by: NEWSPAPER

A lightning fire damaged a home and one person was injured while trying to extinguish the flames.

Flash Flood in MONTGOMERY, MARYLAND
From 22-JUN-01 18:00:00 to 22-JUN-01 23:59:00 (EST)
Location: COUNTYWIDE
Reported by: LAW ENFORCEMENT

Numerous roads were flooded and impassable and 3 swift water rescues were reported.

Thunderstorm Wind in FREDERICK, MARYLAND
From 22-JUN-01 16:10:00 to 22-JUN-01 16:10:00 (EST)
Location: FREDERICK
Property damage: .5K
Reported by: LAW ENFORCEMENT

Trees were downed in the Putman Road area.

Lightning in CARROLL, MARYLAND
From 22-JUN-01 19:00:00 to 22-JUN-01 19:00:00 (EST)
Location: MT AIRY
Reported by: NEWSPAPER

Lightning started a fire at a garage which contained several vintage cars.

Heavy Rain in HARFORD, MARYLAND
From 22-JUN-01 19:00:00 to 22-JUN-01 20:30:00 (EST)
Location: EAST PORTION
Reported by: TRAINED SPOTTER

Flash Flood in CARROLL, MARYLAND
From 22-JUN-01 20:30:00 to 22-JUN-01 23:00:00 (EST)
Location: COUNTYWIDE
Reported by: LAW ENFORCEMENT

A few roads and low lying areas were flooded and rushing water downed trees on Gillis Falls Road.

Flash Flood in HOWARD, MARYLAND
From 22-JUN-01 21:00:00 to 22-JUN-01 23:59:00 (EST)
Location: COUNTYWIDE
Reported by: FIRE DEPT/RESCUE SQUAD

Roads rapidly flooded and several motorists had to be rescued from their vehicles.

Lightning in CARROLL, MARYLAND
From 23-JUN-01 00:30:00 to 23-JUN-01 00:30:00 (EST)
Location: WESTMINSTER
Property damage: 70K
Reported by: NEWSPAPER

A garage apartment was damaged by a lightning fire.

Heavy Rain in WASHINGTON, MARYLAND
From 22-JUN-01 15:00:00 to 22-JUN-01 17:00:00 (EST)
Location: COUNTYWIDE
Reported by: TRAINED SPOTTER

Heavy Rain in FREDERICK, MARYLAND
From 22-JUN-01 15:15:00 to 22-JUN-01 17:15:00 (EST)
Location: COUNTYWIDE
Reported by: TRAINED SPOTTER