Thunderstorms with very heavy rainfall, frequent lightning, and damaging winds moved through central Maryland during the afternoon and evening of the 12th.  Several locations reported downed trees and power lines in addition to flooding. In Frederick County, trees and wires were downed in Urbana and Green Valley.  Up to 40 trees were downed in New Market, including some which had to be cleared from roads.  A tree fell onto a house on Lewisdale Road in Hyattstown. A home in New Midway and in New Market were struck by lightning.  In Carroll County, a county road was inundated with water. A stream that runs through Wakefield Valley Golf Course in Westminster overflowed onto low lying areas. In Baltimore County, a stream overflowed its banks and a road and several basements were flooded in Towson.  An observer in Towson recorded 2.52 inches of rain and two inches of this total fell in 45 minutes. Five roads were flooded in Parkville. In Baltimore, six roads were flooded. In addition, pea sized hail fell in Towson and Baltimore. An observer in Kingsville recorded 1.8 inches of rain in 2 hours.  In Harford County, 2.06 inches of rain was recorded in Fallston. A handful of basements were flooded. Hail of unknown size also fell.  In Montgomery County, trees were downed onto Sleepy Hollow Lane in Rockville.  Trees were also downed onto Shannondale Drive and Pretoria Drive in Silver Spring and in the communities of Brookeville and Laytonsville.  A wind gust of 60 MPH was reported in Germantown.  Route 355 in Gaithersburg was closed by high water. A low water bridge on Hyattstown Road near Prescott Road was underwater.  Little Seneca Creek overflowed its banks, reaching a stage of 8.1 feet at Dawsonville around 9 PM. Flood stage at this location is 8 feet. Goshen Branch near Damascus also flooded. A handful of motorists were caught in rising water and had to be rescued by emergency personnel. Rescuers also rescued a dog that was caught on a rock in the raging Potomac River near Old Angler's Inn. In addition, a few homes were struck by lightning.  A 30 vehicle pileup on Interstate 270 near Montrose Road was also blamed on the storm. In Anne Arundel County, trees and power lines were downed in Riviera Beach, Annapolis, Arnold and Cape St. Claire.  Some roads were blocked and four homes were slightly damaged by the fallen trees.  Large trees and power lines were also downed along College Parkway and Alemeda Parkway.  A wind gust of 43 MPH was recorded in Shadyside and a gust of 41 MPH was recorded in Annapolis. Lightning struck five houses an a few trees across the county. In Prince George's County, a wind gust of 83 MPH was recorded at Andrews Air Force Base. A gust of 49 MPH was recorded in Bladensburg and a gust of 42 MPH was recorded in Landover. Trees were downed onto the Baltimore-Washington Parkway near the intersection of Route 410 in Greenbelt. The intersection of Route 450 and Greenvale Parkway was flooded in Landover Hills. In Mt. Rainer, Queens Chapel Road and other low lying areas were flooded.  Fire fighters had to rescue several drivers from their cars countywide.  Countywide, several homes and a commercial structure were struck by lightning and two serious fires were reported. In Charles County, many trees were downed south of La Plata. A wind gust of 41 MPH was recorded in Waldorf.  In St. Mary's County, trees were downed in Thompson's Corner, Compton, Chaptico, Country Lakes, and Mechanicsville.  A home in Compton was damaged by a felled tree.

Flash Flood in CARROLL, MARYLAND
From 12-JUN-03 18:00:00 to 12-JUN-03 19:00:00 (EST)
Location: COUNTYWIDE
Reported by: LAW ENFORCEMENT

A county road was flooded.

Lightning in FREDERICK, MARYLAND
From 12-JUN-03 18:00:00 to 12-JUN-03 18:00:00 (EST)
Location: COUNTYWIDE
Reported by: NEWSPAPER

Two homes were struck by lightning.

Flash Flood in PRINCE GEORGE'S, MARYLAND
From 12-JUN-03 17:00:00 to 12-JUN-03 19:00:00 (EST)
Location: COUNTYWIDE
Reported by: FIRE DEPT/RESCUE SQUAD

Roads were flooded and several water rescues were conducted.

Flash Flood in CARROLL, MARYLAND
From 12-JUN-03 18:00:00 to 12-JUN-03 19:15:00 (EST)
Location: COUNTYWIDE
Reported by: TRAINED SPOTTER

A stream overflowed its banks in Westminster.

Flash Flood in BALTIMORE CITY (C), MARYLAND
From 12-JUN-03 17:00:00 to 12-JUN-03 19:30:00 (EST)
Location: BALTIMORE
Reported by: TRAINED SPOTTER

Six roads were flooded.

Heavy Rain in HARFORD, MARYLAND
From 12-JUN-03 18:00:00 to 12-JUN-03 22:00:00 (EST)
Location: COUNTYWIDE
Reported by: TRAINED SPOTTER

Flash Flood in MONTGOMERY, MARYLAND
From 12-JUN-03 20:15:00 to 12-JUN-03 21:15:00 (EST)
Location: COUNTYWIDE
Reported by: TRAINED SPOTTER

Several roads were flooded.

Thunderstorm Wind in FREDERICK, MARYLAND
From 12-JUN-03 16:25:00 to 12-JUN-03 16:45:00 (EST)
Location: COUNTYWIDE
Magnitude: 50 EG
Property damage: 1K
Reported by: NEWSPAPER

Trees and wires were downed.

Thunderstorm Wind in ANNE ARUNDEL, MARYLAND
From 12-JUN-03 17:15:00 to 12-JUN-03 17:30:00 (EST)
Location: NORTH PORTION
Magnitude: 50 EG
Property damage: 2K
Reported by: NEWSPAPER

Trees and power lines were downed.

Heavy Rain in ANNE ARUNDEL, MARYLAND
From 12-JUN-03 17:00:00 to 12-JUN-03 19:00:00 (EST)
Location: COUNTYWIDE
Reported by: TRAINED SPOTTER

Flash Flood in BALTIMORE, MARYLAND
From 12-JUN-03 17:00:00 to 12-JUN-03 19:30:00 (EST)
Location: COUNTYWIDE
Reported by: TRAINED SPOTTER

A stream overflowed its banks and roads and basements were flooded.

Thunderstorm Wind in CHARLES, MARYLAND
From 12-JUN-03 16:30:00 to 12-JUN-03 16:30:00 (EST)
Location: LA PLATA
Magnitude: 50 EG
Property damage: 2K
Reported by: NEWSPAPER

Many trees were downed south of town.

Thunderstorm Wind in MONTGOMERY, MARYLAND
From 12-JUN-03 16:35:00 to 12-JUN-03 16:35:00 (EST)
Location: SILVER SPG
Magnitude: 50 EG
Property damage: 1K
Reported by: TRAINED SPOTTER

Trees were downed onto Shannondale Drive and Pretoria Drive.

Thunderstorm Wind in PRINCE GEORGE'S, MARYLAND
From 12-JUN-03 17:00:00 to 12-JUN-03 17:00:00 (EST)
Location: ANDREWS AFB
Magnitude: 72 MG
Reported by: AWOS,ASOS,MESONET,ETC

A wind gust of 83 MPH was recorded. The time was estimated.

Lightning in PRINCE GEORGE'S, MARYLAND
From 12-JUN-03 16:30:00 to 12-JUN-03 17:30:00 (EST)
Location: COUNTYWIDE
Reported by: NEWSPAPER

Several homes and a commercial structure were struck by lightning and two serious fires resulted.

Thunderstorm Wind in PRINCE GEORGE'S, MARYLAND
From 12-JUN-03 17:15:00 to 12-JUN-03 17:15:00 (EST)
Location: GREENBELT
Magnitude: 50 EG
Property damage: 1K
Reported by: NEWSPAPER

Trees were downed onto the Baltimore-Washington Parkway near the intersection of Route 410.

Lightning in ANNE ARUNDEL, MARYLAND
From 12-JUN-03 17:00:00 to 12-JUN-03 18:00:00 (EST)
Location: COUNTYWIDE
Reported by: FIRE DEPT/RESCUE SQUAD

Five homes were struck by lightning.

Thunderstorm Wind in ST. MARY'S, MARYLAND
From 12-JUN-03 16:20:00 to 12-JUN-03 16:30:00 (EST)
Location: COUNTYWIDE
Magnitude: 50 EG
Property damage: 2K
Reported by: FIRE DEPT/RESCUE SQUAD

Trees were downed, including one which fell onto a house.

Thunderstorm Wind in MONTGOMERY, MARYLAND
From 12-JUN-03 16:25:00 to 12-JUN-03 16:25:00 (EST)
Location: ROCKVILLE
Magnitude: 50 EG
Property damage: 1K
Reported by: TRAINED SPOTTER

Trees were downed onto Sleepy Hollow Lane.