A slow moving warm front and a low pressure system that formed along it that enhanced the convergence brought flooding rains to northern Delaware during the afternoon and in particular the evening of the 12th. The heavy rain saturated the soil and a few shallow rooted trees fell down. About 1,000 homes and businesses lost power. A series of thunderstorms with very heavy rain formed and moved along the warm frontal boundary. The rain did not end until an occluded front neared Delaware overnight on the 12th. Numerous showers and thunderstorms started during the late morning of the 12th and the heaviest rain fell during the afternoon and early evening.  The rain ended early on the 13th. Event precipitation totals averaged 2 to 4 inches with the highest amounts in central New Castle County.
In addition to the fresh water flooding, the onshore flow combined with unusually high spring tides associated with the full moon to produce the most widespread minor tidal flooding during the evening and overnight high tide cycle on the 12th. This extended up the Delaware Bay and Delaware River. Some minor tidal flooding also occurred during the evening high tide cycles on the 10th and 11th, but the high tides were lower.  The highest tides occurred on the 12th and included: 6.30 feet above mean lower low water in Lewes (Sussex County), minor tidal flooding starts at 6.0 feet above mean lower low water;  7.60 feet above mean lower low water at Reedy Island (New Castle County); minor tidal flooding starts at 7.2 feet above mean lower low water.

Flood in NEW CASTLE, DELAWARE
From 12-AUG-14 20:00:00 to 12-AUG-14 23:00:00 (EST-5)
Location: CENTERVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Bands of heavy rain caused poor drainage flooding in northern New Castle County during the evening of the 12th. The heavy rain also saturated the soil and knocked over a few shallow rooted trees. About 1,000 homes and businesses lost power in the county. Vehicles became stuck in flood waters at the Christiana Mall. Twaddell Mill Road was flooded and closed between Montchanin Road and Kennett Pike.  Event precipitation totals included 4.10 inches in Odessa, 3.48 inches in Glasgow, 3.23 inches in Middletown, 3.10 inches in Townsend, 3.08 inches in Blackbird, 2.65 inches in New Castle, 2.51 inches at the New Castle County Airport, 2.22 inches in Pike Creek, 2.17 inches in Newport and 2.02 inches in Claymont.

Flash Flood in NEW CASTLE, DELAWARE
From 12-AUG-14 19:30:00 to 12-AUG-14 22:30:00 (EST-5)
Location: COOCHS BRIDGE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

The heaviest rain within New Castle County called small stream and poor drainage flash flooding during the evening of the 12th. The heaviest rain in the county fell in Saint Georges and Appoquinimink Hundreds.  Delaware State Route 9 had high water on it east of Odessa.  Event precipitation totals included 4.10 inches in Odessa, 3.48 inches in Glasgow, 3.23 inches in Middletown, 3.10 inches in Townsend, 3.08 inches in Blackbird, 2.65 inches in New Castle, 2.51 inches at the New Castle County Airport, 2.22 inches in Pike Creek, 2.17 inches in Newport and 2.02 inches in Claymont.