According to the weather forecast, Hurricane Isabel will be here tomorrow afternoon. The eye of the storm will actually pass to the west of us as it heads north-west. I haven't yet found any estimates of the wind speeds for this area.
Hurricanes start losing their energy once they are over land but I haven't been able to find information on how fast that happens. Rainfall estimates also seem to vary. One report said between 2 and 5 inches while another said up to 12 inches.
My conservative estimates are 45 mph winds and 5 inches of rain. I've tied down anything in the yard with a relatively low density (e.g. our wooden picnic table). My fluid dynamics textbooks are at work so I used Bernoulli's equation to roughly estimate the wind pressure. If we get 60 mph winds, like they have predicted for southern Maryland, we are in for much more damage.
I'm probably overreacting but, given my limited hurricane experience, I feel it's better to error on the side of caution. I feel sorry for the people living nearer to the coast. Even though the storm has been downgraded to category 2 it's still going to cause a lot of damage.