A strengthening coastal low pressure system brought several rounds of rain to the region Sunday night into Monday (December 17-18th). Total rainfall amounts across the forecast area varied from about 1.50 inches up to 7.00 inches. The heaviest rains fell across southern Delaware up through the coastal plain of New Jersey. This heavy rain fell on already saturated soils. As a result, river flooding was prevalent across the Passaic Basin, Raritan Basin, and southeast Pennsylvania basins including the Schuylkill and Brandywine. The Brandywine flooding extended in to Delaware. Smaller streams and rivers across northern New Castle County in Delaware, such as the Christina, Red Clay, and White Clay also flooded.

Flood in PHILADELPHIA, PENNSYLVANIA
From 18-DEC-23 04:00:00 to 19-DEC-23 00:00:00 (EST-5)
Location: (PHL)PHILADELPHIA IN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

Across southeast Pennsylvania and northern Delaware, flooding occurred on the Brandywine River, the Schuylkill River, the Christina River, Red Clay Creek, and White Clay Creek.  The Cooch���s Bridge gauge crested at 12.2 ft. The Langhorne gauge crested at 13.59 ft. The Downingtown gauge crested at 10.94 ft. The Newark gauge crested at 14.45 ft. The Chadd���s Ford gauge crested at 12.18 ft. The Wooddale gauge crested at 8.58 ft. The Graterford gauge crested at 16.30 ft. The Chester gauge crested at 11.87 ft. The Philadelphia gauge crested at 11.82 ft. The Pottstown gauge crested at 13.92. The Norristown gauge crested at 15.85. The Langhorne gauge crested at 13.59 ft.  The Wilmington gauge crested at 17.08 ft. All of these crests are above flood stage.

Flood in MONTGOMERY, PENNSYLVANIA
From 18-DEC-23 09:00:00 to 19-DEC-23 10:00:00 (EST-5)
Location: BALA CYNWYD
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

Across southeast Pennsylvania and northern Delaware, flooding occurred on the Brandywine River, the Schuylkill River, the Christina River, Red Clay Creek, and White Clay Creek.  The Cooch���s Bridge gauge crested at 12.2 ft. The Langhorne gauge crested at 13.59 ft. The Downingtown gauge crested at 10.94 ft. The Newark gauge crested at 14.45 ft. The Chadd���s Ford gauge crested at 12.18 ft. The Wooddale gauge crested at 8.58 ft. The Graterford gauge crested at 16.30 ft. The Chester gauge crested at 11.87 ft. The Philadelphia gauge crested at 11.82 ft. The Pottstown gauge crested at 13.92. The Norristown gauge crested at 15.85. The Langhorne gauge crested at 13.59 ft.  The Wilmington gauge crested at 17.08 ft. All of these crests are above flood stage.

Flood in LEHIGH, PENNSYLVANIA
From 18-DEC-23 05:00:00 to 18-DEC-23 11:00:00 (EST-5)
Location: CENTER VLY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A stretch of PA 309 in Upper Saucon Township was closed between Center Valley Parkway and Camp Meeting Road. In Whitehall Township, a portion of PA 145 northbound was closed.

Flood in DELAWARE, PENNSYLVANIA
From 18-DEC-23 06:00:00 to 18-DEC-23 13:00:00 (EST-5)
Location: RIDLEY PARK
Flood cause: Heavy Rain
Property damage: 300.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Multiple homes were flooded in the area of Springfield Road and Florence Avenue in Darby and Collingdale. There was a water rescue of one person from their vehicle in Lansdowne. Multiple roads closed in Ridley and Darby.

Flood in PHILADELPHIA, PENNSYLVANIA
From 18-DEC-23 04:19:00 to 18-DEC-23 06:00:00 (EST-5)
Location: WEST PHILADELPHIA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

University Avenue near 34th Street closed due to flooding.

Flood in BERKS, PENNSYLVANIA
From 18-DEC-23 04:52:00 to 18-DEC-23 07:00:00 (EST-5)
Location: MERTZTOWN
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Multiple vehicles were stuck in flood waters overtaking the bridge on Valley Road in Mertztown.

Flood in BERKS, PENNSYLVANIA
From 18-DEC-23 07:15:00 to 18-DEC-23 09:00:00 (EST-5)
Location: GRILL
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Portions of 724 closed due to flooding.

Flood in MONTGOMERY, PENNSYLVANIA
From 18-DEC-23 08:30:00 to 18-DEC-23 11:00:00 (EST-5)
Location: WOXALL
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Swamp Creek Road flooded near Unami Creek.

Flood in CHESTER, PENNSYLVANIA
From 18-DEC-23 06:00:00 to 18-DEC-23 15:00:00 (EST-5)
Location: STRICKERSVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Across southeast Pennsylvania and northern Delaware, flooding occurred on the Brandywine River, the Schuylkill River, the Christina River, Red Clay Creek, and White Clay Creek.  The Cooch���s Bridge gauge crested at 12.2 ft. The Langhorne gauge crested at 13.59 ft. The Downingtown gauge crested at 10.94 ft. The Newark gauge crested at 14.45 ft. The Chadd���s Ford gauge crested at 12.18 ft. The Wooddale gauge crested at 8.58 ft. The Graterford gauge crested at 16.30 ft. The Chester gauge crested at 11.87 ft. The Philadelphia gauge crested at 11.82 ft. The Pottstown gauge crested at 13.92. The Norristown gauge crested at 15.85. The Langhorne gauge crested at 13.59 ft.  The Wilmington gauge crested at 17.08 ft. All of these crests are above flood stage.
Four major roads were closed in Chester County during the course of the flooding. PA-82 in Coatesville and West Marlborough Township was closed for a period starting at 945 AM Dec 18. PA 282 east bound in East Brandywine township and PA 842 in East Bradford Township were closed for a period beginning around Noon on December 18.

Flood in BUCKS, PENNSYLVANIA
From 18-DEC-23 08:00:00 to 18-DEC-23 22:00:00 (EST-5)
Location: CROYDEN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

Across southeast Pennsylvania and northern Delaware, flooding occurred on the Brandywine River, the Schuylkill River, the Christina River, Red Clay Creek, and White Clay Creek.  The Cooch���s Bridge gauge crested at 12.2 ft. The Langhorne gauge crested at 13.59 ft. The Downingtown gauge crested at 10.94 ft. The Newark gauge crested at 14.45 ft. The Chadd���s Ford gauge crested at 12.18 ft. The Wooddale gauge crested at 8.58 ft. The Graterford gauge crested at 16.30 ft. The Chester gauge crested at 11.87 ft. The Philadelphia gauge crested at 11.82 ft. The Pottstown gauge crested at 13.92. The Norristown gauge crested at 15.85. The Langhorne gauge crested at 13.59 ft.  The Wilmington gauge crested at 17.08 ft. All of these crests are above flood stage.
Four roads were closed for a period during the course of the flooding in Bucks County. PA 532 in Newtown Township, PA 32 in Lower and Upper Makefield Townships, PA 332 in NOrthampton Township, and PA 413 in Middletown Township.