The combination of a strong high pressure system to the north and a nor'easter low pressure system that passed to the east of Delaware produced strong to high winds in Sussex County. It also caused heavy rain to fall during the day and early evening on the 16th. Storm totals averaged two to three inches across the region. The rain started across the region during the evening of the 15th. The heaviest rain fell from about 8 a.m. EDT through 8 p.m. EDT on the 16th. Precipitation changed to a wintry mix of sleet and freezing rain before it ended across Kent County. All precipitation ended around 1 a.m. EDT on the 17th. The strongest winds occurred during the afternoon of the 16th as that was when the tightest pressure gradient (difference in surface pressure between the high and low pressure system) occurred in Delaware.
The high winds caused a few scattered outages across lower Delaware. The heavy rain caused minor flooding on Sussex County roadways and led to high water problems on 5 roadways in southern Kent County in Felton, Milford and Harrington. The heavy rain did also cause erosion, drainage and runoff problems in newly developed areas.

Storm totals included 3.20 inches in Lincoln (Sussex County), 2.95 inches at the Dover Air Force Base (Kent County), 2.91 inches in Redden (Sussex County), 2.86 inches in Bridgeville (Sussex County), 2.83 inches in Prime Hook (Sussex County), 2.50 inches in Georgetown (Sussex County), 2.46 inches in Millville (Sussex County), 2.30 inches in Sandtown (Kent County) and 2.20 inches in Greenwood (Sussex County). Peak wind gusts (all in Sussex County) included 66 mph in Lewes, 50 mph in Roosevelt Inlet and 41 mph in Georgetown.
The heavy rain and strong to high winds were caused by a nor'easter low pressure system that developed on a cold front that moved through the area on the 15th. The low pressure system formed over South Carolina and Georgia on the morning of the 16th and moved northeast. At 2 p.m. EDT on the 16th, it was near Myrtle Beach, South Carolina; at 8 p.m. EDT that evening, it was just east of Virginia Beach; at 2 a.m. EDT on the 17th, it was about 100 miles east of Atlantic City, New Jersey and was about 100 miles south of Cape Cod, Massachusetts at 8 a.m. EDT on the 17th. As central pressures go, this was not particularly a powerful system; it was only 996 millibars the morning of the 17th. What contributed to the event was the strong high pressure system (about 1040 millibars the morning of the 16th). It supplied the fresh cold air and increased the pressure gradient (and consequently the wind) between itself and the developing nor'easter low pressure system. This difference (and thus the winds) peaked during the afternoon of the 16th.

Heavy Rain in SUSSEX, DELAWARE
From 16-MAR-07 07:00:00 to 16-MAR-07 19:00:00 (EST-5)
Location: SLAUGHTER BEACH
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

High Wind in INLAND SUSSEX, DELAWARE
From 16-MAR-07 11:00:00 to 16-MAR-07 17:00:00 (EST-5)
Magnitude: 57.00 MG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: C-MAN Station

Strong Wind in DELAWARE BEACHES, DELAWARE
From 16-MAR-07 11:00:00 to 16-MAR-07 17:00:00 (EST-5)
Magnitude: 45.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Mesonet

Heavy Rain in KENT, DELAWARE
From 16-MAR-07 07:00:00 to 16-MAR-07 19:00:00 (EST-5)
Location: FELTON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper