BETHESDA, MD (WUSA) -- It's almost impossible to know how many trees Irene tore up. Fair to say thousands across the Mid-Atlantic. And potentially scores of homes.
What do you do if it's YOUR home?

You may want to start your work well before the storm. Tree experts say certain types of trees are especially vulnerable to high winds... and so are trees struggling to hold on to a steep hillside.

"The tulip poplars and the trees on steep grades don't have as good root system wind comes through the wrong way and just blows them out of the ground," says Craig Goebel of Colesville Lawn and Limb.

WASHINGTON (AP) -- The head of the nation's emergency response agency says people shouldn't underestimate the danger once Hurricane Irene passes.

Federal Emergency Management Agency chief Craig Fugate says flooding, weakened trees and downed power lines pose a danger even after the storm moves north up the Atlantic Coast.

Fugate is urging people not to drive around and sightsee after the storm has passed through their areas. His advice: Stay inside, stay off the roads, and let the power crews do their job.

Fugate made the round of the Sunday talk shows as the storm moved through New York City and the Northeast.

The D.C. Metro area is clearly thinking about the strength of Hurricane Irene...just look at this Twitter trend map of the area.