Interior problem likely result of an exterior problem...
The hardwood floor in our living room has recently been getting damp after heavy rains, but only in a limited area under the dog bed. It is not wet dog or dog urine, as only the floor and underside of the bed is wet. The living room is on the upper floor, which is cantilevered out by about two feet - and is vented much like a roof soffit. (this allows outside air into the space between the floor joists...)
We live near the pacific coast (~2 miles) in the San Francisco area. Recent storms have produced driving rain from the east, which would blast it directly onto the patio door and window near the damp area on the floor. The patio door and large floor-to-ceiling window near the damp area do not show any signs of leaking, and there seems to be no standing water or signs of water above the floor.
We've had similar weather since moving into this house and this is the first sign of the dampness. Any thoughts before I tear up the floor or ceiling below to investigate?