By the time we got home, we'd driven through three of these things (or maybe three times through the same storm). After getting the car into the garage, we noted that the horizontal surfaces have little dimples in them - though none broke thru the paint.
Still not sure the hearing has returned to normal; my head feels like it was inside a large bell when someone rang it!!!!!
INFORMATION POSTED ON THE APNEA BOARD WEB SITE AND FORUMS ARE PERSONAL OPINIONS ONLY AND NOT NECESSARILY STATEMENTS OF FACT.