A slow moving cold front with waves of low pressure along it brought heavy rain to Southeast Pennsylvania on the 16th. This caused poor drainage flooding as well as some minor flooding of creeks in and around Philadelphia. Rain began during the early morning of the 16th and fell heavy at times throughout the event. It ended during the late afternoon with event totals of two to four inches, highest in Montgomery County. The combination of the heavy rain runoff, higher astronomical tides associated with the recent full moon and an up the Delaware Bay flow on the 16th caused minor tidal flooding along the Delaware River and some of its tidal tributaries with the overnight high tide cycle on the 16th. The high tide in Philadelphia reached 8.2 feet above mean lower low water, the threshold for the start of minor tidal flooding.

Flood in PHILADELPHIA, PENNSYLVANIA
From 16-MAY-14 14:21:00 to 16-MAY-14 23:46:00 (EST-5)
Location: MANAYUNK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The Wissahickon Creek at its mouth was above its 5 foot flood stage from 321 p.m. EDT through 1246 a.m. EDT on the 17th. It crested at 5.82 feet at 845 p.m. EDT. Event precipitation totals included 2.11 inches in Wyndmoor and 1.57 inches at the Philadelphia International Airport.

Flood in CHESTER, PENNSYLVANIA
From 16-MAY-14 15:25:00 to 16-MAY-14 16:40:00 (EST-5)
Location: HARMONY HILL
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The East Branch of the Brandywine Creek at Downingtown was above its 7 foot flood stage from 425 p.m. EDT through 540 p.m. EDT on the 16th. It crested at 7.11 feet at 5 p.m. EDT. Event precipitation totals included 2.21 inches in Valley Forge, 2.13 inches in West Chester, 1.99 inches in Northbrook, 1.94 inches in Nottimngham, 1.88 inches in Kennett Square, 1.70 inches in Spring City, 1.47 inches in Glenmoore and 1.32 inches in Downingtown.

Flood in DELAWARE, PENNSYLVANIA
From 16-MAY-14 13:06:00 to 16-MAY-14 17:15:00 (EST-5)
Location: FLORIDA PARK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The Crum Creek near Newtown Square was above its 6 foot flood stage from 206 p.m. EDT through 615 p.m. EDT on the 16th. It crested at 6.76 feet at 445 p.m. EDT. Event precipitation totals included 2.80 inches in Wayne, 2.78 inches in Norwood, 2.65 inches in Media and 2.30 inches in Drexel Hill.

Flood in MONTGOMERY, PENNSYLVANIA
From 16-MAY-14 15:28:00 to 16-MAY-14 21:41:00 (EST-5)
Location: FT WASHINGTON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The Wissahickon Creek at Fort Washington was above its 10 foot flood stage from 428 p.m. EDT through 723 p.m. EDT on the 16th. It crested at 10.31 feet at 630 p.m. EDT. The East Branch of the Perkiomen Creek at Schwenksville was above its 8 foot flood stage from 631 p.m. EDT through 1041 p.m. EDT on the 16th. It crested at 9.34 feet at 1015 p.m. EDT.
Event precipitation totals included 3.72 inches in Conshohocken, 3.61 inches in North Wales, 3.40 inches in Lansdale, 3.25 inches in King of Prussia, 3.12 inches in Hatfield, 3.05 inches in West Norriton, 2.78 inches in Wynnewood, 1.75 inches in Gilbertsville and 1.44 inches in Pottstown.