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(although, in reality, the sound anyway carries out to infinity),
Ok, lets say when i shout to a friend he can hear me 200m away, but not at 250m. If i then shout into a wind that is blowing from my direction towards my friends would he now be able to hear me 250m away?
If there is no wind the sound waves will radiate in circles (technically spheres) around the source (you) like ripples on a pond. If the wind is blowing then it is a bit like throwing a stone into a moving river, the circular ripples will move with the river / wind. So if there are no issues with noise produced by the wind, your voice should be louder 50m downwind than 50m upwind.