At a friend's home on the top of a hill one can often hear howling winds with the frequency rising and falling in parallel to the strength of the wind's force.
When one blows over a mouth of a jug or blows a whistle or plays a musical instrument like a flute or recorder, the force can have a small effect of say a few percent on frequency which can be understood as some nonlinearity.
But in the case of the howling wind frequency seems to be roughly linearly proportional or at least close; I've heard a continuous howl change by almost one octave (a factor of 2) in a single run.
Are howling winds produced by at least an approximately resonant process? If so, is the resonant volume determined by both geometry and the speed of the wind?
A quick search through YouTube will find numerous examples of the sound: https://www.youtube.com/results?search_query=howling+wind