After Diane crossed into Virginia, it dropped heavy rainfall of over in 24 hours in the Blue Ridge Mountains, peaking at in Big Meadows. There, the rains were enhanced by moist air rising over the mountain peaks and condensing, a process known as orographic lift. Rainfall of over occurred throughout Virginia, as well as into the Eastern Panhandle of West Virginia, where was reported at Stony River Reservoir. Similar precipitation amounts fell through Delaware, including at the National Arboretum in Washington, D.C. Rivers across the region rose above flood stage, including the James River which crested at in Columbia, Virginia, which was above flood stage. High amounts of rainfall accrued in eastern Pennsylvania, peaking at in Pecks Pond in the northeast portion of the state. As with Virginia, the heaviest rainfall occurred due to orographic lift near a mountain. In neighboring New Jersey, the highest precipitation was near Sussex. Rainfall in New York peaked at in Lake Mohonk.