A coastal low pressure moved up the Atlantic seaboard. Copious moisture spread northward across much of North Central and Northeast Maryland. Rainfall totals of 3 to 6 inches were widespread, with isolated higher amounts, causing fairly widespread flooding.

Flood in MONTGOMERY, MARYLAND
From 21-JUL-18 20:29:00 to 22-JUL-18 12:29:00 (EST-5)
Location: SENECA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The stream gage on Seneca Creek near Dawsonville exceeded the 7.5 foot flood stage during the indicated period. The peak level of 10.84 feet occurred at 1:15am EST on July 22nd. Berryville Road floods near Darnestown and creekside trails are also flooded at these levels. This crest was the highest observed since 2014.

Flash Flood in BALTIMORE, MARYLAND
From 21-JUL-18 22:30:00 to 21-JUL-18 23:40:00 (EST-5)
Location: HALETHORPE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The USGS stream gage on East Branch Herbert Run near Arbutus rapidly rose well above flood stage during the indicated period. Flooding of yards and outbuildings was reported in the area. The peak level of 10.55 feet occurred at 10:45pm EST.

Flood in ANNE ARUNDEL, MARYLAND
From 21-JUL-18 23:02:00 to 22-JUL-18 11:27:00 (EST-5)
Location: BALTIMORE HIGHLANDS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The stream gage on the Patapsco River near Elkridge exceeded the 16 foot flood stage during the indicated period. The peak level of 17.43 feet was observed at 1:50am EST. Hammonds Ferry Road and Furnace Avenue were flooded.

Flood in ST. MARY'S, MARYLAND
From 21-JUL-18 22:00:00 to 22-JUL-18 00:18:00 (EST-5)
Location: GREAT MILLS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The USGS stream gage on St. Mary's River at Great Mills exceeded the 6 foot flood stage during the indicated period. The peak level of 6.19 feet occurred at 11:00pm EST on July 21st. Yards were flooded in the area, with water approaching Flat Iron Road.

Flood in ANNE ARUNDEL, MARYLAND
From 21-JUL-18 16:19:00 to 21-JUL-18 18:00:00 (EST-5)
Location: RUTLAND
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Maryland Route 450 (Defense Highway) flooded and closed near Saint Stephens Church Road.

Flood in MONTGOMERY, MARYLAND
From 21-JUL-18 18:51:00 to 21-JUL-18 21:00:00 (EST-5)
Location: CARDEROCK SPGS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Maryland Route 191 (Bradley Boulevard) flooded, with water flowing across the road, and was closed north of River Road.

Flash Flood in MONTGOMERY, MARYLAND
From 21-JUL-18 20:35:00 to 21-JUL-18 22:00:00 (EST-5)
Location: CARDEROCK SPGS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Water rescue during torrential rainfall on Bradley Boulevard near Kentsdale Drive.

Flood in MONTGOMERY, MARYLAND
From 22-JUL-18 03:55:00 to 22-JUL-18 06:59:00 (EST-5)
Location: UNITY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The USGS stream gage on the Patuxent River near Unity exceeded the 8 foot flood stage during the indicated period. The peak level of 8.61 feet occurred at 6:00am EST. The parking lot for the Patuxent River State Park near Route 97 flooded.

Flash Flood in BALTIMORE CITY (C), MARYLAND
From 21-JUL-18 23:09:00 to 22-JUL-18 01:30:00 (EST-5)
Location: WALBROOK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The USGS stream gage on Gwynns Falls in Baltimore rapidly exceeded the 13 foot flood stage during the indicated period. The peak level of 18.29 feet was observed at 12:15am EST on July 22nd. Gwynns Falls Park was flooded during this period.

Flash Flood in MONTGOMERY, MARYLAND
From 21-JUL-18 21:38:00 to 21-JUL-18 22:30:00 (EST-5)
Location: CLOPPER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Vehicle stranded in high water after torrential rains on Game Preserve Road near I-270.

Flood in FREDERICK, MARYLAND
From 21-JUL-18 20:30:00 to 21-JUL-18 22:30:00 (EST-5)
Location: LIME KILN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Lime Kiln Way flooded and closed near English Muffin Way.

Flood in FREDERICK, MARYLAND
From 21-JUL-18 21:33:00 to 21-JUL-18 22:30:00 (EST-5)
Location: WALKERSVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Water rescue reported on Crum Road at Israel Creek.

Flash Flood in MONTGOMERY, MARYLAND
From 21-JUL-18 22:00:00 to 21-JUL-18 23:00:00 (EST-5)
Location: HUNTING HILL
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A swift water rescue occurred on Quince Orchard Road near Muddy Branch.

Flash Flood in MONTGOMERY, MARYLAND
From 21-JUL-18 22:06:00 to 21-JUL-18 23:00:00 (EST-5)
Location: PARKWOOD
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A swift water rescue occurred on Beach Drive near Kensington Parkway along Rock Creek.

Flash Flood in MONTGOMERY, MARYLAND
From 21-JUL-18 22:23:00 to 21-JUL-18 23:15:00 (EST-5)
Location: CLARKSBURG
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A swift water rescue was performed on Frederick Road (Maryland State Route 355) at Little Seneca Creek.

Flood in MONTGOMERY, MARYLAND
From 21-JUL-18 21:46:00 to 21-JUL-18 23:00:00 (EST-5)
Location: CLOPPER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Clopper Road flooded and closed near Firstfield Road. Around 18 inches of standing water reported in the area.

Flood in FREDERICK, MARYLAND
From 21-JUL-18 21:47:00 to 21-JUL-18 23:00:00 (EST-5)
Location: THURMONT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

High water was reported on Main Street in the 100 block, causing a road closure.

Flood in FREDERICK, MARYLAND
From 21-JUL-18 22:14:00 to 21-JUL-18 23:45:00 (EST-5)
Location: URBANA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Urbana Pike flooded and closed near Big Woods Road at Bennett Creek.

Flash Flood in BALTIMORE, MARYLAND
From 21-JUL-18 23:20:00 to 22-JUL-18 00:45:00 (EST-5)
Location: HALETHORPE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Several different swift water rescues ongoing in the corridor between Arbutus and Woodlawn.

Flash Flood in FREDERICK, MARYLAND
From 21-JUL-18 23:53:00 to 22-JUL-18 00:45:00 (EST-5)
Location: RIDGEVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Water rescue for vehicle stranded in rapidly rising water on Mill Bottom Road at Bush Creek.

Flood in MONTGOMERY, MARYLAND
From 21-JUL-18 23:01:00 to 21-JUL-18 23:59:00 (EST-5)
Location: ROCK CREEK FOREST
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Vehicle trapped in high water on Beach Drive near East-West Highway.

Flood in ANNE ARUNDEL, MARYLAND
From 22-JUL-18 02:30:00 to 22-JUL-18 04:30:00 (EST-5)
Location: RAYNOR HGTS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Nursery Road flooded and closed. Hammonds Ferry Road also flooded and closed nearby. A water rescue was reported in this same area.

Flood in ANNE ARUNDEL, MARYLAND
From 22-JUL-18 02:30:00 to 22-JUL-18 04:30:00 (EST-5)
Location: RAYNOR HGTS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Nursery Road flooded and closed. Hammonds Ferry Road also flooded and closed nearby. A water rescue was reported in this same area.

Flood in CARROLL, MARYLAND
From 22-JUL-18 04:57:00 to 22-JUL-18 07:00:00 (EST-5)
Location: UNION BRIDGE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Maryland State Route 75 flooded and closed at Little Pipe Creek in Union Bridge.

Flood in FREDERICK, MARYLAND
From 22-JUL-18 03:32:00 to 22-JUL-18 13:48:00 (EST-5)
Location: EMMITSBURG
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The USGS stream gage on the Monocacy River near Bridgeport exceeded the 13 foot flood stage during the indicated period. The peak level of 15.28 feet occurred at 9:30am EST. At these levels, Baptist Road near Bridgeport floods.

Flood in CARROLL, MARYLAND
From 22-JUL-18 00:16:00 to 22-JUL-18 06:12:00 (EST-5)
Location: KEYMAR
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Big Pipe Creek near Bruceville exceeded the 8 foot flood stage during the indicated period. The peak level of 10.43 feet was observed at 3:00am EST. Keysville-Bruceville Road was flooded.

Flash Flood in CHARLES, MARYLAND
From 21-JUL-18 21:00:00 to 21-JUL-18 23:00:00 (EST-5)
Location: HILL TOP
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Dozens of roads were flooded across the county due to torrential rainfall.

Flash Flood in MONTGOMERY, MARYLAND
From 21-JUL-18 21:36:00 to 21-JUL-18 23:00:00 (EST-5)
Location: BURDETTS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The USGS stream gage on Tenmile Creek near Boyds rapidly exceeded the 7 foot flood stage during the indicated period. The peak level of 7.77 feet occurred at 10:30pm EST. Old Baltimore Road was flooded along with nearby agricultural land.

Flood in FREDERICK, MARYLAND
From 22-JUL-18 05:38:00 to 23-JUL-18 06:58:00 (EST-5)
Location: GROVE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The stream gage on the Monocacy River at I-70 near Frederick exceeded the 15 foot flood stage during the period indicated. The peak level of 17.62 feet was observed at 11:15pm EST on July 22nd. Pinecliff and Rivermist parks were flooded, along with portions of Monocacy Battlefield and Buckeystown Community Park.

Flood in ANNE ARUNDEL, MARYLAND
From 21-JUL-18 22:14:00 to 22-JUL-18 04:23:00 (EST-5)
Location: ARUNDEL GARDENS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

The USGS stream gage on Sawmill Creek at Glen Burnie exceeded the 5 foot flood stage during the indicated period. The peak level of 6.80 feet occurred at 11:45pm EST. Central Avenue was flooded. For a portion of the time, near the peak, Crain Highway was reported flooded and closed at Sawmill Creek, and water covered the Northwest Baltimore and Annapolis Trail.