2002 Ford Focus SE: noise from the front passenger-side wheel area

For my 2002 Ford Focus SE, over the past weeks a noise started that is coming from around my front passenger side wheel.
The odd part is that it only happens in specific situations and at
specific times of the day: absolutely bizarre.
What happens is that if I park my car in my work parking lot on a very slight grade, and then leave work late at night when it is cooler outside, when I back my car out of the parking space I hear a rubbing noise from around my front passenger side wheel. When I then pull out of the parking lot, when I hit any slight dips in the road, I will hear the rubbing noise. just during the dip. When I take the first interstate ramp to get on the highway, I will hear noise from the wheel area when I go around the sharp ramp to get onto the interstate. However, from that point forward, and at all other times of the day, the noise goes away. At the same time of the day I can drive from other locations and not hear the noise.
I jacked up my car and pulled on the tire, and the bearing does not appear to be loose.
Does anyone have any idea what it could be? Or, any other tests I can try to diagnose the problem.
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I too had a similar strange noise (totally different car though).
Spent weeks trying to figure out what it was. Turned out to be the tyre! The tread was starting to separate, and depending on how it was parked it would make it either better or worse. Sometimes it made a rustling noise, other times a thumping noise. Only happened once I'd reached certain speeds, only happened on certain roads. It drove me mad. I'm just glad it was a simple a a tyre problem :-)
Al.
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