Moisture gets into the motor all the time, but is boiled out when the oil heats up. Only time moisture can cause a problem is when you never let the car heat up properly and it starts to turn the oil white because water is collecting.
Water, in large quantities on the other hand, will really cause a problem...like bent rods and locking the motor up.
cause after that noreaster yesterday i started my car today, and its running rele crappy....the exhaust is makin a puttin sound, and ive lost power. Didnt drive it at all during storm tho.