My car started to make this abnormal noise several weeks ago. The noise occured more frequently when I sped up and disappeared when it came to complete stop. I was thinking maybe it's time to purchase the extended warranty and just dealer it. Fortunately, I didn't waste my money on that but this is what I found.
The inner edge of the tire was completely bald and the metal belt inside was rubbing the ground. The guy at Discount Tire told me I must be trying to kill myself by driving with this tire condition.
Guys! Check your tires regularly and don't do something stupid like I did.