"Bumb" feeling front tires

Outside change there actually was something minor on the road, just you didn't notice it? Especially if it doesn't happen again, and the tires check out ok.

You can have a pretty good look at the tires yourself: visually check what you can, and just run your hand along the tire face, for the rest. Then maybe roll the car forward or back a foot and repeat, to check the portion that was against the ground.

 

It's likely you just got rock or two caught in the treads and driving a bit removed them. I often notice that my tires are imbalanced after coming off of dirt roads or road construction with loose bits of road, but it clears up in a minute or two of driving. However it's worth inspecting your tires to be sure.

If the bumpy feeling comes back, it can be a sign that some of the threads in a tire are broken internally and a blowout will happen soon. It's probably not this, but worth checking to make sure your spare has full pressure and you everything you'd need to change a tire if needed.

 

speed bump, no worries.