Deep layer southerly flow advected a moist, tropical airmass into the Mid-Atlantic. As low pressure approached from the west, periods of heavy rain and thunderstorms moved across Maryland.  Flash flooding occurred in a number of places, with rainfall totals as high as 4.75 inches in Baltimore County.

Flash Flood in BALTIMORE, MARYLAND
From 14-AUG-11 09:22:00 to 14-AUG-11 12:00:00 (EST-5)
Location: WOODLAWN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

The intersection of Rutherford Road and Ambassador Road were closed due to flash flooding.  A nearby spotter measured 3.13 inches of rain.

Flood in BALTIMORE, MARYLAND
From 14-AUG-11 10:00:00 to 14-AUG-11 12:00:00 (EST-5)
Location: POPLAR
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Flooding was reported in the 500 block of Compass Road.  A nearby rain gage observed 2.29 inches.

Flash Flood in BALTIMORE, MARYLAND
From 14-AUG-11 11:00:00 to 14-AUG-11 13:00:00 (EST-5)
Location: SPARROWS PT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Numerous high water rescues were performed.  A rain gage in the city recorded 2.47 inches.

Flash Flood in MONTGOMERY, MARYLAND
From 14-AUG-11 21:00:00 to 14-AUG-11 23:00:00 (EST-5)
Location: PARKWOOD
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Portions of Interstate 495 and 270 Interchange were closed due to high water from Rock Creek.  A nearby rain gage recorded 2.40 inches.

Flash Flood in FREDERICK, MARYLAND
From 14-AUG-11 21:00:00 to 14-AUG-11 23:00:00 (EST-5)
Location: ADAMSTOWN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Several roads were closed due to high water.

Flash Flood in MONTGOMERY, MARYLAND
From 14-AUG-11 21:12:00 to 14-AUG-11 23:00:00 (EST-5)
Location: NORTHWEST PARK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Several lanes of Route 650 were closed at Interstate 495.  Rainfall in the area was measured at 2.23 inches.

Flash Flood in MONTGOMERY, MARYLAND
From 14-AUG-11 21:30:00 to 14-AUG-11 23:00:00 (EST-5)
Location: GAITHERSBURG
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Southbound Interstate 270 closed near Interstate 370 due to high water.  A spotter nearby measured 3.52 inches of rain.

Flash Flood in PRINCE GEORGE'S, MARYLAND
From 14-AUG-11 21:30:00 to 14-AUG-11 23:00:00 (EST-5)
Location: BERWYN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Southbound Route 1 was closed at College Avenue due to high water.  A rain gage nearby measured 2.70 inches.

Flash Flood in PRINCE GEORGE'S, MARYLAND
From 14-AUG-11 21:30:00 to 14-AUG-11 23:00:00 (EST-5)
Location: BRANCHVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Two lanes of northbound Interstate 95 were closed at Exit 25 due to high water.

Flash Flood in MONTGOMERY, MARYLAND
From 14-AUG-11 21:40:00 to 14-AUG-11 23:00:00 (EST-5)
Location: PURDUM
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Water was flowing across a bridge on Kings Valley Road. Rain measured 2.72 inches in 45 minutes.

Flash Flood in ANNE ARUNDEL, MARYLAND
From 15-AUG-11 07:30:00 to 15-AUG-11 09:00:00 (EST-5)
Location: RAYNOR HGTS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

One to 1.5 feet of water forced the closed of Nursey Road and Hammonds Ferry Road.  A spotter nearby recorded 2.20 inches of rain.

Flash Flood in ANNE ARUNDEL, MARYLAND
From 15-AUG-11 07:30:00 to 15-AUG-11 09:00:00 (EST-5)
Location: NORTH LINTHICUM
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Twelve to 18 inches of water forced closure of Belle Grove and Camp Mead Roads.  A nearby rain gage measured 1.88 inches.

Flash Flood in BALTIMORE, MARYLAND
From 15-AUG-11 07:30:00 to 15-AUG-11 09:00:00 (EST-5)
Location: BALTIMORE HIGHLANDS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

One to 1.5 feet of water forced the closure of Maple Road and Route 648.  A nearby rain gage measured 2.83 inches.

Flash Flood in ANNE ARUNDEL, MARYLAND
From 15-AUG-11 07:30:00 to 15-AUG-11 09:00:00 (EST-5)
Location: BROOKLYN PARK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Twelve to 18 inches of water forced the closure of 10th Avenue and Belle Grove Road.  A nearby rain gage tallied 1.68 inches.

Flash Flood in ANNE ARUNDEL, MARYLAND
From 15-AUG-11 07:30:00 to 15-AUG-11 09:00:00 (EST-5)
Location: ARUNDEL GARDENS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

One to 1.5 feet of water forced the closure of Ritchie Highway and Shelley Road.  A spotter in the area measured 1.36 inches of rain.

Flash Flood in BALTIMORE, MARYLAND
From 15-AUG-11 08:20:00 to 15-AUG-11 09:30:00 (EST-5)
Location: BALTIMORE HIGHLANDS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Over two inches of rain caused an apartment complex to flood.  Thirty-four people were rescued by firefighters.

Flash Flood in BALTIMORE, MARYLAND
From 15-AUG-11 08:25:00 to 15-AUG-11 10:00:00 (EST-5)
Location: SPARROWS PT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

South Gilmore Street was closed due to high water.

Flash Flood in BALTIMORE, MARYLAND
From 15-AUG-11 08:30:00 to 15-AUG-11 09:30:00 (EST-5)
Location: BALTIMORE HIGHLANDS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Annapolis Road was closed at Waterview Road and Route 295.

Flash Flood in BALTIMORE, MARYLAND
From 15-AUG-11 08:30:00 to 15-AUG-11 09:30:00 (EST-5)
Location: BALTIMORE HIGHLANDS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Reedbird Road was closed due to high water.

Flash Flood in BALTIMORE, MARYLAND
From 15-AUG-11 08:30:00 to 15-AUG-11 09:30:00 (EST-5)
Location: BALTIMORE HIGHLANDS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

West Patapsco Road was closed due to high water.

Flash Flood in BALTIMORE, MARYLAND
From 15-AUG-11 08:44:00 to 15-AUG-11 10:00:00 (EST-5)
Location: CATONSVILLE MANOR
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

Bloomingdale Road was closed due to high water.

Flash Flood in BALTIMORE, MARYLAND
From 15-AUG-11 09:09:00 to 15-AUG-11 10:30:00 (EST-5)
Location: BARE HILLS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

North Fulton Avenue was closed due to high water.

Flash Flood in BALTIMORE, MARYLAND
From 15-AUG-11 12:30:00 to 15-AUG-11 14:00:00 (EST-5)
Location: BALTIMORE HIGHLANDS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Police were evacuating areas of Spelman Road.  Basements were reported flooded with over 5 feet of water.

Flash Flood in PRINCE GEORGE'S, MARYLAND
From 14-AUG-11 21:17:00 to 14-AUG-11 23:00:00 (EST-5)
Location: AMMENDALE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: State Official

The intersection of Baltimore Avenue and Prince Georges Avenue was closed due to flooding.  A nearby spotter observed 2.82 inches of rain.