Loud roaring noise in front end when car is moving

In January 2016, I noticed that there was roaring type of noise that began on the underside of the car. I had to purchase two new tires which were put on the front of the car in February 2016. Since the tires have been put on, the noise has gotten louder and I can feel the vibration of the noise in the gas pedal, but it only makes the sound when the car is moving. The car performs fine and there are no other issues. I have gone back to where I purchased the tires to see if they can find out what the noise is. They could not find anything.
Thanks for your help.