A nearly stationary low pressure trough existing in a moist and unstable atmosphere aided in the development of showers and thunderstorms across northern Maryland.  Slow storm movement caused flash flooding across the Baltimore metropolitan area as rainfall rates of over 1 inch per hour occurred.  Rainfall totals reached as high as 3.10 in Montgomery County.

Flash Flood in BALTIMORE, MARYLAND
From 08-JUL-11 00:00:00 to 08-JUL-11 01:00:00 (EST-5)
Location: HUNT VLY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

A swift water rescue was performed at the intersection of York Road and Beaver Run Lane.

Flash Flood in BALTIMORE, MARYLAND
From 08-JUL-11 00:00:00 to 08-JUL-11 01:00:00 (EST-5)
Location: OREGON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Multiple roadways were reported closed due to flash flooding in and around Cockeysville.

Flash Flood in FREDERICK, MARYLAND
From 08-JUL-11 14:25:00 to 08-JUL-11 16:00:00 (EST-5)
Location: FREDERICK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Many major roadways throughout the city of Frederick were flooded.

Flash Flood in HOWARD, MARYLAND
From 08-JUL-11 15:30:00 to 08-JUL-11 17:00:00 (EST-5)
Location: SAVAGE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Northbound Route 1 was closed between North 2nd Street and Davis due to flash flooding. Water was about 3 feet deep. Rainfall totals near the event measured 2.93 inches.

Flash Flood in HARFORD, MARYLAND
From 08-JUL-11 15:45:00 to 08-JUL-11 17:00:00 (EST-5)
Location: VAN BIBBER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A vehicle was stranded in floodwaters at the intersection of Routes 24 and 40.  A nearby rain gage measured 2.20 inches.

Flash Flood in ANNE ARUNDEL, MARYLAND
From 08-JUL-11 15:45:00 to 08-JUL-11 17:00:00 (EST-5)
Location: GREEN HAVEN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Mountain Road was closed due to flash flooding at intersection with Tick Neck Road.  A nearby rain gage measured 2.80 inches.

Flash Flood in BALTIMORE, MARYLAND
From 07-JUL-11 17:20:00 to 07-JUL-11 19:00:00 (EST-5)
Location: ESSEX
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Up to 6 inches of water was flooding across Eastern Avenue between Wiltshire and Mace Avenues. Rainfall Rates of up to one inch per hour were measured near this location.

Flash Flood in BALTIMORE, MARYLAND
From 07-JUL-11 17:35:00 to 07-JUL-11 19:00:00 (EST-5)
Location: WHITE MARSH
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Route 40 was closed near Stevens Road.

Flash Flood in BALTIMORE, MARYLAND
From 07-JUL-11 17:45:00 to 07-JUL-11 19:00:00 (EST-5)
Location: TURNER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Portions of Quarantine Road were flooded.

Flash Flood in BALTIMORE, MARYLAND
From 08-JUL-11 16:00:00 to 08-JUL-11 17:00:00 (EST-5)
Location: DUNDALK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The intersection of North Point Blvd. and Norris Lane was closed due to overflowing creek.  A nearby spotter measured 1.72 inches of rain.

Flash Flood in PRINCE GEORGE'S, MARYLAND
From 08-JUL-11 16:19:00 to 08-JUL-11 18:00:00 (EST-5)
Location: UPPER MARLBORO
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Route 301 and Chew Road was closed due to flash flooding.  A nearby spotter measured 1.14 inches of rain.

Flash Flood in ANNE ARUNDEL, MARYLAND
From 08-JUL-11 16:30:00 to 08-JUL-11 18:00:00 (EST-5)
Location: ANNAPOLIS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Intersection of St. Stephens Road and Route 450 were closed due to flash flooding.

Flood in ANNE ARUNDEL, MARYLAND
From 08-JUL-11 16:32:00 to 08-JUL-11 18:00:00 (EST-5)
Location: GREEN HAVEN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Mountain Road at Catherine Avenue was flooded by about one foot of standing water.

Flash Flood in PRINCE GEORGE'S, MARYLAND
From 08-JUL-11 17:15:00 to 08-JUL-11 19:00:00 (EST-5)
Location: DULEY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A swift water rescue was performed at the intersection of Duley Station Road and Wallace Lane.

Flash Flood in BALTIMORE, MARYLAND
From 07-JUL-11 17:45:00 to 07-JUL-11 19:00:00 (EST-5)
Location: LUTZ HILL
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

North Point Road was flooded between Kane Street and Quad Avenue.

Flash Flood in BALTIMORE, MARYLAND
From 07-JUL-11 18:00:00 to 07-JUL-11 20:00:00 (EST-5)
Location: TURNER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

A swift water rescue was performed at the intersection of North Avondale Road and Sellers Point Road.

Flash Flood in BALTIMORE, MARYLAND
From 07-JUL-11 18:00:00 to 07-JUL-11 20:00:00 (EST-5)
Location: ST HELENA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

A swift water rescue was performed on Dundalk Avenue.

Flash Flood in BALTIMORE, MARYLAND
From 07-JUL-11 18:00:00 to 07-JUL-11 20:00:00 (EST-5)
Location: DUNDALK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

A swift water rescue was performed at the intersection of North Point Road and German Hill Road.

Flash Flood in BALTIMORE, MARYLAND
From 07-JUL-11 18:00:00 to 07-JUL-11 20:00:00 (EST-5)
Location: ST HELENA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

A swift water rescue was performed on Dundalk Avenue.

Flash Flood in ANNE ARUNDEL, MARYLAND
From 07-JUL-11 19:45:00 to 07-JUL-11 21:00:00 (EST-5)
Location: FOREMAN CORNERS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

The intersection of Fort Smallwood Road and Hawkins Point Road was closed due to flash flooding.

Flash Flood in BALTIMORE, MARYLAND
From 07-JUL-11 19:45:00 to 07-JUL-11 21:00:00 (EST-5)
Location: BALTIMORE HIGHLANDS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

A swift water rescue was performed at the intersection of Myrtle and Tulip Avenues.

Flash Flood in BALTIMORE, MARYLAND
From 07-JUL-11 19:45:00 to 07-JUL-11 21:00:00 (EST-5)
Location: HALETHORPE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

A swift water rescue was performed on Halthorpe Avenue.

Flash Flood in BALTIMORE, MARYLAND
From 07-JUL-11 19:45:00 to 07-JUL-11 21:00:00 (EST-5)
Location: BALTIMORE HIGHLANDS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Intersection of West Patapsco Avenue and Marmenco Court was closed due to flash flooding.

Flash Flood in BALTIMORE, MARYLAND
From 07-JUL-11 19:45:00 to 07-JUL-11 21:00:00 (EST-5)
Location: SPARROWS PT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Portion of South Hanover Street was closed due to flooding.

Flash Flood in BALTIMORE, MARYLAND
From 07-JUL-11 19:45:00 to 07-JUL-11 21:00:00 (EST-5)
Location: BALTIMORE HIGHLANDS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Waterview Avenue was closed due to flash flooding at its intersection with Interstate 95.

Flash Flood in BALTIMORE, MARYLAND
From 07-JUL-11 19:45:00 to 07-JUL-11 21:00:00 (EST-5)
Location: SPARROWS PT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Intersection of Aliceanna and Caroline Streets closed due to flash flooding.

Flash Flood in BALTIMORE, MARYLAND
From 07-JUL-11 19:45:00 to 07-JUL-11 21:00:00 (EST-5)
Location: BALTIMORE HIGHLANDS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Washington Blvd. was closed at Interstate 95 due to flash flooding.

Flash Flood in BALTIMORE, MARYLAND
From 07-JUL-11 19:45:00 to 07-JUL-11 21:00:00 (EST-5)
Location: SPARROWS PT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Intersection of Fleet and South Caroline Streets were closed due to flash flooding.

Flash Flood in BALTIMORE, MARYLAND
From 07-JUL-11 19:45:00 to 07-JUL-11 21:00:00 (EST-5)
Location: SPARROWS PT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Flooding on Haines Street.

Flash Flood in BALTIMORE CITY (C), MARYLAND
From 07-JUL-11 19:45:00 to 07-JUL-11 21:00:00 (EST-5)
Location: CAMDEN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Intersection of Washington Blvd and Monroe Street was closed due to flash flooding.

Flash Flood in BALTIMORE, MARYLAND
From 07-JUL-11 20:00:00 to 07-JUL-11 22:00:00 (EST-5)
Location: HALETHORPE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Benson Avenue was closed at South Grantley Street due to flash flooding.

Flash Flood in BALTIMORE, MARYLAND
From 07-JUL-11 23:45:00 to 08-JUL-11 01:00:00 (EST-5)
Location: HUNT VLY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Flash flooding forced closure of Ashland and York Roads intersection.

Flood in ANNE ARUNDEL, MARYLAND
From 08-JUL-11 15:50:00 to 08-JUL-11 17:00:00 (EST-5)
Location: JACOBSVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Several inches of water were covering various sections of Mountain Road.  A nearby rain gage measured 0.81 inches.