I know that during bad weather the noise of aircraft are magnified. What exactly causes the noise to be louder? For example, last night we heard loud engines at 4000 feet approaching LGA Rwy 4. At other times, we don't hear the engines at all. What causes this? I believe it was snowing lightly at the time. I can also sometimes hear departures from 4L at JFK during stormy weather. Incidentally, I live in Sheepshead Bay.
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