Yesterday I was talking about Isabel, but called it "Elena" -- anyway last year it hit Virginia after the ground was already saturated with much rain, knocked down many many many trees. Apparently the situation today is similar, much rain lately, ground already saturated.
Big oak trees in urban/suburban areas just keeled over because the roots were not deep due to development.
This storm SHOULD be weaker than Isabel was in your area.
That said, the region has gotten way too much rain recently. I wouldn't doubt some problems from wind, moreso from flooding.