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Wheel bearings could be the problem. While moving and steering to the left, if the noise increases, it could be the RIGHT wheel bearing. And the opposite when steering to the right. I wouldn't rule out brake noise though. Rotors almost overnight get a surface rust and must be worn off when first driving in the morning. Very common in high humid areas.
I had some issues with my 2005 explorer left rear. It was making a creepy old door sound at low speeds and then a high pitched whisel at high speeds. That turned out to be a broken wheel bearing and had it replaced. Note each wheel has two wheel bearings. After that a new noise developed that sounded like metal scraping/ grinding metal. It end up being the brake dust cover got bent when they replaced the bearing and it was rubbing something, the fix for that was bending it so it didn't rub. I hope this helps.
this sounds odd but mine did this when i replaced the wipers. it seems the design of the wiper frame was making a whistle at higher speeds. the freestar wipers are exposed on the window cowl and not hidden so they endure the winds at high speed. it is worth a shot.
Sounds like you have a failing wheel bearing. Once you start hearing it, does it get louder or more high pitched the faster you go? Do you hear it get quieter when you turn left at speed, or louder when you go right at speed? If any of those are a yes, I'd have the wheel bearing inspected and replaced if necessary.