Upper-level low pressure remained over the region while a warm and humid air mass was in place. This resulted in showers and thunderstorms, some of which produced locally heavy rainfall.

Flash Flood in BALTIMORE, MARYLAND
From 13-AUG-18 17:29:00 to 13-AUG-18 19:29:00 (EST-5)
Location: ROGERS FORGE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Two water rescues occurred due to motorists trapped in high water in the Towson area.

Flash Flood in BALTIMORE, MARYLAND
From 13-AUG-18 17:30:00 to 13-AUG-18 19:30:00 (EST-5)
Location: PARKVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

About a dozen cars were flooded and lifted off Loch Raven Boulevard near Walker Avenue.

Flash Flood in BALTIMORE, MARYLAND
From 13-AUG-18 17:25:00 to 13-AUG-18 19:25:00 (EST-5)
Location: ROGERS FORGE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Four cars were trapped in flood waters near the intersection of Putty Hill Avenue and Goucher Boulevard.

Flash Flood in BALTIMORE, MARYLAND
From 13-AUG-18 17:26:00 to 13-AUG-18 19:26:00 (EST-5)
Location: COCKEYSVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Several vehicles were trapped in flood water near the intersection of Warren Road and Bosley Road.

Flood in HARFORD, MARYLAND
From 13-AUG-18 04:22:00 to 13-AUG-18 06:22:00 (EST-5)
Location: NORRISVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Flooding was reported along a creek on Buttermilk Road near Norrisville.

Flood in BALTIMORE, MARYLAND
From 13-AUG-18 17:25:00 to 13-AUG-18 19:25:00 (EST-5)
Location: SPARROWS PT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Five roads were closed due to flooding in Baltimore City.

Flood in BALTIMORE, MARYLAND
From 13-AUG-18 17:52:00 to 13-AUG-18 19:52:00 (EST-5)
Location: CARNEY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Magledt Road was impassable due to flooding.

Flood in HARFORD, MARYLAND
From 13-AUG-18 18:55:00 to 13-AUG-18 20:55:00 (EST-5)
Location: DUBLIN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

MD-440 Dublin Road was closed due to flooding west of US-1 Conowingo Road.

Flash Flood in BALTIMORE, MARYLAND
From 13-AUG-18 17:22:00 to 13-AUG-18 17:31:00 (EST-5)
Location: STONELEIGH
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The USGS stream gage on West Branch Herring Run near Idlewylde very briefly but rapidly exceeded the 9 foot flood stage, peaking at 9.42 feet.  Yards were flooded in the area, along with a portion of parkland downstream in Baltimore City.

Flash Flood in BALTIMORE, MARYLAND
From 13-AUG-18 17:24:00 to 13-AUG-18 17:40:00 (EST-5)
Location: OAKLEIGH
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The stream gage on Minebank Run near Glen Arm briefly, but rapidly, exceeded the 10 foot flood stage during the indicated period, flooding lands and an access road near Talmar for a brief period of time. The peak level of 10.41 feet occurred at 5:30pm EST.

Flash Flood in BALTIMORE, MARYLAND
From 13-AUG-18 17:26:00 to 13-AUG-18 19:26:00 (EST-5)
Location: ROGERS FORGE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A vehicle was trapped in high water near the intersection of Cromwell Bridge Road and Providence Road.

Flood in BALTIMORE, MARYLAND
From 13-AUG-18 02:52:00 to 13-AUG-18 03:54:00 (EST-5)
Location: WHITE MARSH
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The stream gage on Whitemarsh Run exceeded the 11 foot flood stage during the indicated period, flooding parking lots in the vicinity. The peak level of 12.27 feet occurred at 3:15am EST.

Flash Flood in BALTIMORE, MARYLAND
From 13-AUG-18 18:54:00 to 13-AUG-18 19:22:00 (EST-5)
Location: WHITE MARSH
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The stream gauge at Whitemarsh Run indicated that water rapidly rose above flood stage of 11 feet, cresting at 11.34 feet. Water flooded parking lots near the stream, particularly near Town Center Court.