A westerly wind means that the atmosphere is moving faster than the Earth spins.
It simply means a south-westerly wind.
A wind that blows from west to east is called a westerly wind. The direction of origin is the name of the wind.
When a wind is easterly, it blows from the east towards the west. However, when the wind is eastward, it blows from the west towards the east. The suffix is what determines the direction. "Ly" means from and "ward" means towards. From your example, I would say that the wind is coming FROM the north and blowing TOWARD the south.
Neptune has no atmosphere which means no wind.
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A wind blowing from east to west is called a westerly wind.
Nothing. There is no atmosphere on the moon, which means no wind.
Scientists would describe a westerly wind as blowing from the west, typically between 270 to 360 degrees on a compass.