the.com/westerly

means Coming from the west — used of winds (and the weather systems they drag along) that blow out of the western sky toward the east.

from Built from 'west' plus the directional suffix '-erly,' the same pattern as 'northerly' or 'southerly.' That suffix traces back to Old English '-weard'/'-lice' type endings used to form directional adverbs, and 'west' itself is an old Germanic compass word, related to forms in Old Norse and Old High German, ultimately linked to a root meaning simply 'toward the setting sun.' Sailors and meteorologists kept the word precise: by convention, winds are named for the direction they come FROM, so a westerly is born in the west and travels east — the opposite logic of naming a street 'the road to the coast.'