A weak cold front settled over the forecast area from June 23 until June 27.  Waves of low pressure rode northeast along the front.  Flow in the atmosphere was parallel to the boundary, producing several rounds of training echoes.  As a result, double digit rainfall totals affected parts of the region through the five days.  Scattered areas of flash flooding began on June 23 and continued into June 24.  Then, flooding began to take on a more serious nature since the ground had become saturated in so many spots. A slow-moving line of thunderstorms fired along a tropical moisture plume and dumped between 4 and 7 inches across the Baltimore Metro, causing extensive urban flooding on June 25 and June 26. Major disruption of transportation was experienced June 26 due to the flooding. MARC Commuter rail experienced disruptions, flooding in underground tunnels forced much of the Washington Metro rail to close, and numerous roads were closed due to high water or mudslides. Nearly 2000 people in Montgomery County were evacuated when engineers on site determined that the Lake Needwood Dam may fail due to substantially above normal water levels on June 28.  Fortunately, this did not occur.  Unfortunately however, 5 people lost their lives due to flooding.  Three adults died when they were washed out of the bed of a pickup truck east of Myersville in Frederick County Maryland. They evacuated their car when it stalled in high water near Ellerton on Route 17 along the Middle Creek around 8:30 PM. The driver of the pickup truck gave the three a ride shortly before the three people went missing. It is unsure whether they were swept out or tried to swim. Additionally, two teenagers died after exploring Little Pipe Creek in New Midway, MD, along the Frederick-Carroll County line. They were last seen at 6:30 PM when they left home to explore Little Pipe Creek in Carroll County. One bicycle and some clothing belonging to the boys were found at the bank of the creek near Route 194. Authorities believe the boys went swimming and were washed away. The currents June 28 were so strong that one of the rescue boats capsized and injured a man.

Flash Flood in CHARLES, MARYLAND
From 27-JUN-06 14:00:00 to 27-JUN-06 23:00:00 (EST)
Location: COUNTYWIDE
Property damage: 50K
Reported by: EMERGENCY MANAGER

Flooding and downed trees due to saturated grounds were reported countywide. Flash flooding occurred on Middletown Road, Billingsley Road, and Turkey Hill Road in Waldorf and White Plains. Bryans Road and Fenwick Road experienced flash flooding. Bumpy Oak Road and Pomfret Road in Pomfret reported flash flooding.

Flash Flood in MONTGOMERY, MARYLAND
From 25-JUN-06 18:00:00 to 25-JUN-06 21:00:00 (EST)
Location: GERMANTOWN
Reported by: EMERGENCY MANAGER

Several water rescues were reported near Germantown due to flash flooding.

Flash Flood in CARROLL, MARYLAND
From 27-JUN-06 15:30:00 to 28-JUN-06 12:00:00 (EST)
Location: COUNTYWIDE
Reported by: EMERGENCY MANAGER

Two people were rescued from a Mount Airy home at the intersection of Twin Arch and Old Frederick Roads after the South Branch of the Patapsco River overflowed it banks.  Numerous roads were flooded countywide.

Flash Flood in PRINCE GEORGE'S, MARYLAND
From 25-JUN-06 22:00:00 to 26-JUN-06 16:00:00 (EST)
Location: COUNTYWIDE
Property damage: 2.5M
Reported by: EMERGENCY MANAGER

Six people in several cars were stranded when they drove through a stream that had backed up in the 10800 block of Lanham-Severn Road in Glen Dale. Numerous road closures and water rescues were reported near Brandywine. In Hyattsville, 15 homes were evacuated due to flash flooding. Water rescue teams helped 46 adults and 23 children. In Edmonston, 34 homes flooded and 60 people were rescued due to flash flooding. There were reports of nearly 5 feet of water in basements. Numerous basements were flooded when the Anacostia River overflowed its banks. Standing water was reported on High Bridge Road in Bowie. Governors Bridge Road at the Anne Arundel County line was closed due to high water.

Flash Flood in BALTIMORE, MARYLAND
From 27-JUN-06 19:00:00 to 28-JUN-06 03:00:00 (EST)
Location: COUNTYWIDE
Property damage: 50K
Reported by: EMERGENCY MANAGER

Street flooding was reported throughout the county. Trees were downed due to excessive water and saturated grounds.

Flash Flood in PRINCE GEORGE'S, MARYLAND
From 26-JUN-06 18:30:00 to 27-JUN-06 09:00:00 (EST)
Location: LAUREL
Reported by: EMERGENCY MANAGER

Residents in northern Laurel were evacuated when Rocky Gorge Dam opened floodgates around 730 PM. Residents were allowed to return around 10 AM the next morning.  Several roads were flooded and closed due to the flooding at Rocky Gorge Dam.

Flash Flood in MONTGOMERY, MARYLAND
From 26-JUN-06 13:15:00 to 26-JUN-06 23:00:00 (EST)
Location: COUNTYWIDE
Property damage: 100K
Reported by: EMERGENCY MANAGER

Four junctures of River Road between Potomac Village and Wilson Lane in Bethesda were closed due to high water. There were 14 water rescues of people stranded in vehicles.

Flash Flood in HARFORD, MARYLAND
From 25-JUN-06 22:00:00 to 26-JUN-06 08:00:00 (EST)
Location: COUNTYWIDE
Property damage: 12K
Reported by: EMERGENCY MANAGER

Numerous road closures and water rescues occurred. Regent Drive in the development of West Riding reported flash flooding. A water rescue occurred on Otter Creek.

Flash Flood in HARFORD, MARYLAND
From 26-JUN-06 18:00:00 to 26-JUN-06 22:00:00 (EST)
Location: FALLSTON
Property damage: 50K
Reported by: EMERGENCY MANAGER

Several water rescues reported. One such report was for a 16 year old boy in Fallston. A water rescue occurred in Abington when two 18-year olds drove into high water along South Calvary Road (Route 136) and Philadelphia Road (Route 7). Another water rescue occurred on Barksdale Road and Joppa Farm Road.

Flash Flood in HARFORD, MARYLAND
From 27-JUN-06 16:00:00 to 28-JUN-06 03:00:00 (EST)
Location: COUNTYWIDE
Property damage: 125K
Reported by: EMERGENCY MANAGER

Between 500 and 800 PM, more than a dozen roads in Bel Air, Abingdon, and Joppa were closed due to high water, including Route 40 at the Baltimore-Harford County Line.  There were five incidents of vehicles stuck in flooded roadways. Water rose above the guardrails of a bridge and swept a car 20 ft downstream at the Plum Tree and South Tollgate roads intersection. Overall, at least 3 dozen flooded roads in the county, several water rescues occurred, and numerous trees were downed due to excessive water. There were voluntary evacuations of weekend cabins near Broad Creek in the Darlington area.

Flood in MONTGOMERY, MARYLAND
From 26-JUN-06 07:00:00 to 28-JUN-06 19:00:00 (EST)
Location: DARNESTOWN
Reported by: EMERGENCY MANAGER

Seneca Creek overtopped its banks. Riley's Lock Road was under between 3 and 4 feet of water.

Flash Flood in MONTGOMERY, MARYLAND
From 27-JUN-06 15:30:00 to 28-JUN-06 02:00:00 (EST)
Location: ROCKVILLE
Property damage: 100K
Reported by: EMERGENCY MANAGER

Numerous Road closures were reported countywide. In Derwood, a bridge was damaged over a creek between Bowie Mill Road and Redland Middle School. Asphalt was torn up and debris scattered about.  Nearly 2000 people in Montgomery County were evacuated when engineers on site determined that the Lake Needwood Dam may fail due to substantially above normal water levels on June 28.  Fortunately, this did not occur.

Flash Flood in WASHINGTON, MARYLAND
From 27-JUN-06 13:00:00 to 28-JUN-06 01:00:00 (EST)
Location: HAGERSTOWN
Property damage: 25K
Reported by: EMERGENCY MANAGER

In Hagerstown, several road closures and flooded basements were reported. Saint Clair Avenue and Northern Avenue had high water. Hamilton Run overflowed, flooding a backyard along Brookline Avenue. Route 66 and Mount Edna Road flooded near Boonsboro.

Flash Flood in ANNE ARUNDEL, MARYLAND
From 25-JUN-06 22:00:00 to 26-JUN-06 14:00:00 (EST)
Location: COUNTYWIDE
Property damage: 40K
Reported by: EMERGENCY MANAGER

Numerous flooded roads and water rescues countywide. Some of the hardest hit areas included Maryland City, Jessup, Hanover, and Tipton Airport. Part of Tipton Airfield was cover by more than 3 feet of water. A car was swept off Oak Hill Drive, trapping a 59 year old man inside behind the gates of the Oak Hill Detention Center. The car was submerged above the window sill. He was not injured.

Flash Flood in BALTIMORE, MARYLAND
From 24-JUN-06 16:40:00 to 24-JUN-06 19:00:00 (EST)
Location: WHITE HALL
Property damage: 40K
Reported by: EMERGENCY MANAGER

Spotter reports deep water across Clifford Road in White Marsh. Two swift water rescues with vehicles occurred in Perry Hall, with officials reporting chest high water in the street.

Flash Flood in BALTIMORE CITY (C), MARYLAND
From 25-JUN-06 20:00:00 to 26-JUN-06 01:00:00 (EST)
Location: BALTIMORE
Reported by: EMERGENCY MANAGER

The Water Treatment Plant reported that streams overflowed their banks across the city. Jones Falls topped its banks, flooding parts of Clipper Mill Road and Union Avenue. Thames Street in the Fells Point neighborhood flooded.

Flash Flood in FREDERICK, MARYLAND
From 27-JUN-06 16:00:00 to 28-JUN-06 11:00:00 (EST)
Location: COUNTYWIDE
Property damage: 500K
Reported by: EMERGENCY MANAGER

A mudslide closed a section of Harp Mill Road in Wolfsville. Numerous road closures and water rescues were reported countywide.  The Monacacy River overflowed, flooding a parking lot and field along Monocacy Boulevard. Basement flooding occurred in Emmitsburg, Myersville and Middletown. Shank Road was closed indefinitely to repair a washed-out pipe.Three adults died when they were washed out of the bed of a pickup truck east of Myersville. They evacuated their car when it stalled in high water near Ellerton on Route 17 along the Middle Creek around 830 PM. The driver of the pickup truck gave the three a ride shortly before the three people went missing. It is unsure whether they were swept out or tried to swim. Additionally, two teenagers died after exploring Little Pipe Creek in New Midway along the Frederick-Carroll County line. They were last seen at 630 PM when they left home to explore Little Pipe Creek in Carroll County. One bicycle and some clothing belonging to the boys was found at the bank of the creek near MD Route 194. Authorities believe the boys went swimming and were washed away. The currents on June 28 were so strong that one of the rescue boats capsized and injured a man who was performing rescue operations.

Flash Flood in HARFORD, MARYLAND
From 24-JUN-06 16:00:00 to 24-JUN-06 23:00:00 (EST)
Location: COUNTYWIDE
Property damage: 50K
Reported by: EMERGENCY MANAGER

Numerous road closures and water rescues were reported countywide. Some of the hardest hit areas were near Bel Air and Joppa. In Bel Air, Plum Tree Run overflowed its banks. A water rescue was needed when a vehicle was washed over the embankment on South Tollgate Road.  In Joppa, Whitaker Mill Road as well as Bel Air Road between Harford Road and Connolly Road flooded.

Flash Flood in CALVERT, MARYLAND
From 26-JUN-06 01:00:00 to 26-JUN-06 04:00:00 (EST)
Location: CHESAPEAKE BEACH
Reported by: EMERGENCY MANAGER

A mudslide occurred on B Street near the boardwalk in Chesapeake Beach.

Flash Flood in HOWARD, MARYLAND
From 25-JUN-06 18:30:00 to 26-JUN-06 00:00:00 (EST)
Location: COUNTYWIDE
Property damage: 150K
Reported by: EMERGENCY MANAGER

Numerous road closures and water rescues reported countywide. Some of the hardest hit areas were Ellicott City, Savage and Columbia. Three families were rescued by boat from flooded homes. Deer Creek came out of its banks along Sandy Hook Road. Part of the Vollmerhausen Road Bridge was washed away. Harriet Tubman Lane was closed due to high water and mud in Simpsonville.

Flash Flood in MONTGOMERY, MARYLAND
From 25-JUN-06 21:00:00 to 26-JUN-06 02:00:00 (EST)
Location: COUNTYWIDE
Property damage: 1.6M
Reported by: EMERGENCY MANAGER

Numerous county roads closed in the southeastern part of the county near the Washington DC line. There were 147 reports of flooded basements. Twenty five swift water rescues occurred.  In Chevy Chase, firefighters used boats to rescue 30 people trapped inside a recreational center. The Chevy Chase Village area off Wisconsin Ave had knee-deep water. There were 45 individual rescues Meadowbrook Park. Water reached the window of a stalled car on a bridge over great Seneca Creek in upper Montgomery County. A road was washed out at US 29 at New Hampshire Avenue in Silver Spring. Three swift water rescues occurred in Rock Creek Park. About 26 vehicles were recovered after water reached their windows. A driveway collapsed on Colesville Road in Silver Spring. Boats were used to rescue 30 men at a field house in Candy Cane City Park. Colesville received 12.5 inches during the event. Significant damage was reported in Northwest Branch Park when the river topped its banks by approximately 100 yards.

Flash Flood in WASHINGTON, MARYLAND
From 25-JUN-06 15:00:00 to 25-JUN-06 18:00:00 (EST)
Location: HAGERSTOWN
Reported by: EMERGENCY MANAGER

Numerous roads closed due to flash flooding.

Flash Flood in ANNE ARUNDEL, MARYLAND
From 27-JUN-06 18:00:00 to 28-JUN-06 01:00:00 (EST)
Location: ANNAPOLIS
Property damage: 30K
Reported by: EMERGENCY MANAGER

Secondary roads near Annapolis were flooded. The entrance to Laurel Park Racetrack was under several inches of water. A foot of water flooded a basement in Annapolis. Route 450 east of Crofton was closed due to high water.

Flash Flood in BALTIMORE, MARYLAND
From 25-JUN-06 20:00:00 to 26-JUN-06 03:00:00 (EST)
Location: COUNTYWIDE
Property damage: 100K
Reported by: EMERGENCY MANAGER

Numerous roads were closed countywide due to flash flooding. Water rescues occurred on Route 45/York Rd as well as on Seminary Road in Towson. A basement flooded in Timonium. Baltimore County Fire Department reports that Philadelphia Road between Raphel Road and Jones Road was closed until further notice due to washout in White Marsh. The Patapsco River overflowed its banks on the Baltimore County side of Frederick Road. Annapolis Road in Baltimore Highlands was flooded. The MARC's Brunswick and Camden routes closed, while other routes were disrupted. In some cases, the understructure of the track was washed away.