Does an overcast sky alter the sound waves coming from above it (like the sound of an airplane)?

This morning, in our little backyard, I heard an airplane that was flying above the clouds, which were completely and uniformly covering the blue sky, as if they formed one big homogeneous grey mass. The wind was sleeping. It was a deep, heavy, roaring sound that seemed to last forever and it wasn’t precisely clear where the sound was coming from. The sound was kinda oscillating and smooth also. It felt kinda strange to hear.
If we assume the deck of clouds to have a certain constant thickness, a uniform mass distribution and take into account the temperature, pressure, moistness, and whatever (or a simplified version), what effect will this have on the sound coming from the plane towards the ground?
Will there be any scattering?
Will it scatter the sound everywhere, just like the atmosphere makes the Sunlight appear to come from everywhere (in blue)? Will the soundwaves pass the clouds undisturbed? Will it depend on the sound’s frequency?

Anyone who has something useful to say?

See also this Quora question.