Low pressure passed directly over the Mid-Atlantic region on the 21st and spawned thunderstorms with winds in excess of 55 MPH, heavy rainfall, frequent lightning, and large hail.  The strongest storm, a supercell, passed through Calvert County and spawned an F1 tornado about 1 mile southeast of Dunkirk.  The tornado had a width of 75 yards, traveled on the ground for 1 1/2 miles and was responsible for over $200,000 worth of damage.  The first building struck by the twister around 3:40 PM EDT was a private school under construction on Mt. Harmony Road about 1/2 mile east of Route 4. The tornado damaged 3 sections of an 8 to 10 ton reinforced brick wall and removed a 30 foot section of roof. Two windows on cars in a nearby parking lot were blown out.  An old wooden barn about 600 yards from the school was also destroyed. The tornado moved east-northeast for about a mile, damaging trees and causing minor home damage along its path as it crossed through Cattertons Reach and Megatha Lane.  The tornado dissipated near the intersection of Chesapeake Road West and Route 2 (Solomons Island Road) at 3:45 PM EDT.  In addition to the tornado damage, a barn filled with farm equipment across from Mt. Harmony Elementary School near Dunkirk was destroyed by downburst winds.  Also, Mid Bay buoy east of St. Leonard recorded a wind gust near 90 knots around 4:00 PM EDT as the same storm moved across the Chesapeake Bay.  Before the supercell became tornadic near Dunkirk, it passed through northern Charles County.  Winds in excess of 55 MPH produced over $50,000 worth of damage. At the intersection of Bensville Road and Courtney Drive west of Waldorf, straight line winds destroyed a two story home under construction around 3:05 PM. Quarter sized hail was reported and ten trees within one half mile of the home were also damaged. Quarter sized hail also fell in White Plains and Waldorf.  A resident of St. Charles reported a funnel cloud at the intersection of St. Charles Parkway and Smallwood Drive at 3:07 PM EDT. Additional thunderstorms moved across Central Maryland between 2 and 7 PM EDT.  In Prince George's County, a postal worker in Clinton was injured around 3:15 PM EDT when lightning struck near her.  Pea sized hail was reported in Accokeek and Clinton.  A motorist near College Park reported seeing a funnel cloud around 4:45 PM EDT. Nickel sized hail fell in Rosaryville. In Charles County, quarter sized hail fell in Lynnbrook around 6:00 PM EDT. Quarter sized hail was also reported in extreme northwest Calvert County around 6:15 PM EDT. In Montgomery County, quarter sized hail fell in Germantown, Rockville, and Wheaton.  Dime sized hail fell in Layhill and Colesville, and half dollar sized hail fell in Gaithersburg.  The volume of hail resulted in accumulations of 3 to 4 inches on lawns and roadways, with drifts up to 10 inches against buildings and fences.  Trees were stripped of leaves, small dents were found on cars, and one neighborhood in Gaithersburg reported chipped paint on homes.  In Howard County, golf ball sized hail fell in Columbia.  In Baltimore County, pea sized hail was reported in Brookland at 5:43 PM EDT.  In Washington County, quarter sized hail fell on the north side of Hagerstown and minor stream flooding was reported after heavy downpours in Hancock. Heavy rain and strong east winds over the Chesapeake Bay also led to tidal flooding in Annapolis Harbor on the morning of the 21st.  Several roads near the City Dock area were flooded with up to 2 feet of water around high tide.  Water poured over the seawall forcing police to barricade Dock Street and to close Compromise Street.  Defense Highway which crosses a wetland flood plain was also flooded, and one vehicle had to be pulled out of the flood waters near Rutland Road.

Hail in CHARLES, MARYLAND
From 21-APR-00 14:07:00 to 21-APR-00 14:07:00 (EST)
Location: WALDORF
Magnitude: 1.00 
Reported by: TRAINED SPOTTER

Quarter sized hail fell.

Hail in HOWARD, MARYLAND
From 21-APR-00 16:05:00 to 21-APR-00 16:05:00 (EST)
Location: COLUMBIA
Magnitude: 1.75 
Reported by: TRAINED SPOTTER

Golf ball sized hail fell.

Funnel Cloud in PRINCE GEORGE'S, MARYLAND
From 21-APR-00 15:45:00 to 21-APR-00 15:45:00 (EST)
Location: COLLEGE PARK
Reported by: GENERAL PUBLIC

Funnel cloud was spotted by a motorist.

Hail in CHARLES, MARYLAND
From 21-APR-00 13:55:00 to 21-APR-00 13:55:00 (EST)
Location: WHITE PLAINS
Magnitude: 1.00 
Reported by: TRAINED SPOTTER

Quarter sized hail fell.

Hail in MONTGOMERY, MARYLAND
From 21-APR-00 15:27:00 to 21-APR-00 15:27:00 (EST)
Location: WHEATON
Magnitude: 1.00 
Reported by: TRAINED SPOTTER

Quarter sized hail fell.

Hail in CALVERT, MARYLAND
From 21-APR-00 17:15:00 to 21-APR-00 17:15:00 (EST)
Location: DUNKIRK
Magnitude: 1.00 
Reported by: TRAINED SPOTTER

Quarter sized hail fell.

Hail in CHARLES, MARYLAND
From 21-APR-00 17:00:00 to 21-APR-00 17:00:00 (EST)
Location: WALDORF
Magnitude: 1.00 
Reported by: TRAINED SPOTTER

Quarter sized hail fell in Lynbrook.

Thunderstorm Wind in CALVERT, MARYLAND
From 21-APR-00 14:40:00 to 21-APR-00 14:40:00 (EST)
Location: DUNKIRK
Property damage: 10K
Reported by: NWS STORM SURVEY

Barn was destroyed and farm equipment was damaged.

Thunderstorm Wind in CALVERT, MARYLAND
From 21-APR-00 15:00:00 to 21-APR-00 15:00:00 (EST)
Location: ST LEONARD
Magnitude: 90 M
Reported by: AWOS,ASOS,MESONET,ETC

Mid Bay Buoy recorded a wind speed near 90 knots.

Lightning in PRINCE GEORGE'S, MARYLAND
From 21-APR-00 14:15:00 to 21-APR-00 14:15:00 (EST)
Location: CLINTON
Reported by: BROADCAST MEDIA

A 38 year old woman was injured by lightning that struck nearby.

Funnel Cloud in CHARLES, MARYLAND
From 21-APR-00 14:07:00 to 21-APR-00 14:07:00 (EST)
Location: ST CHARLES
Reported by: TRAINED SPOTTER

Funnel cloud was spotted at the intersection of St. Charles Parkway and Smallwood Drive.

Thunderstorm Wind in CHARLES, MARYLAND
From 21-APR-00 14:05:00 to 21-APR-00 14:05:00 (EST)
Location: WALDORF
Property damage: 50K
Reported by: BROADCAST MEDIA

Home under construction was destroyed and 10 trees were downed.

Hail in CHARLES, MARYLAND
From 21-APR-00 14:05:00 to 21-APR-00 14:05:00 (EST)
Location: WALDORF
Magnitude: 1.00 
Reported by: TRAINED SPOTTER

Quarter sized hail fell.

Tornado in CALVERT, MARYLAND
From 21-APR-00 14:40:00 to 21-APR-00 14:45:00 (EST)
Location: DUNKIRK
Tornado F-scale: F1
Property damage: 210K
Reported by: NWS STORM SURVEY

A school, 2 cars, 2 barns, and several trees were damaged.

Storm Surge/Tide in ANNE ARUNDEL, MARYLAND
From 21-APR-00 05:00:00 to 21-APR-00 11:00:00 (EST)
Location: ANNAPOLIS
Reported by: NEWSPAPER

Roads near City Dock were flooded around high tide.

Hail in MONTGOMERY, MARYLAND
From 21-APR-00 15:30:00 to 21-APR-00 15:30:00 (EST)
Location: COLESVILLE
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Dime sized hail fell.

Hail in PRINCE GEORGE'S, MARYLAND
From 21-APR-00 16:00:00 to 21-APR-00 16:00:00 (EST)
Location: ROSARYVILLE
Magnitude: 0.88 
Reported by: TRAINED SPOTTER

Nickel sized hail fell.

Hail in WASHINGTON, MARYLAND
From 21-APR-00 13:00:00 to 21-APR-00 13:00:00 (EST)
Location: HAGERSTOWN
Magnitude: 1.00 
Reported by: TRAINED SPOTTER

Quarter sized hail fell on the north side of town.

Hail in MONTGOMERY, MARYLAND
From 21-APR-00 15:17:00 to 21-APR-00 15:17:00 (EST)
Location: GERMANTOWN
Magnitude: 1.00 
Reported by: TRAINED SPOTTER

Quarter sized hail fell.

Hail in MONTGOMERY, MARYLAND
From 21-APR-00 15:21:00 to 21-APR-00 15:21:00 (EST)
Location: LAYHILL
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Dime sized hail fell.

Hail in MONTGOMERY, MARYLAND
From 21-APR-00 15:20:00 to 21-APR-00 15:20:00 (EST)
Location: GAITHERSBURG
Magnitude: 1.25 
Property damage: 20K
Reported by: TRAINED SPOTTER

Half dollar sized hail stripped leaves from trees, put small dents in cars, and chipped paint off houses.

Hail in MONTGOMERY, MARYLAND
From 21-APR-00 15:21:00 to 21-APR-00 15:21:00 (EST)
Location: ROCKVILLE
Magnitude: 1.00 
Reported by: TRAINED SPOTTER

Quarter sized hail fell.