Adhesive weights and hot wheels
Wheel weights come in two forms. Clip-on weights hook over the rim edge; adhesive weights are stuck to the inner face of the wheel.
Adhesive weights are used widely and they work. What they depend on is the bond between the weight and the wheel, and that bond is affected by two things common here: surface temperature, and whether the wheel surface was properly cleaned before the weight went on.
A wheel that reaches high temperatures repeatedly, on a vehicle that is also being washed, is asking more of that bond than one in a temperate climate. When a weight comes off, the assembly is unbalanced from that moment, with no warning and no gradual onset.
Which is why a vibration that appeared suddenly on a vehicle that was smooth last week is worth describing as sudden. That detail points at a lost weight rather than at wear, and it is the quickest thing to confirm.
What to do about it
Nothing exotic. Mention it if a vehicle has a history of losing weights, since there are ways to approach the job differently and the store can only consider that if it knows.
Have assemblies rebalanced after anything that would disturb a weight: a curb, a hard pothole, or a close-range pressure wash aimed into the wheel.
When it is not balance
A vibration at every speed, or one accompanied by a pull, is alignment or something worn. A vibration that survives a balance is usually the rim, and wheel refurbishing is at this store.
The national tire and wheel balancing page covers the occasions worth asking for it.
About this store
The North Las Vegas store carries all nine Purcell tire categories, opens at 7:00 AM, and is managed by Brandon MacIntyre.
See the national tire and wheel balancing page for all 51 locations.