位置與去向
箭頭照著讀：東西在南邊，或者東西正往南邊去。
adjective · B2
Going towards the south, facing the south, or lying in the southern part of a place.
向南的；南邊的
核心畫面
Think of southerly as an arrow that has south written on it. The arrow by itself does not say who is moving; it only says that south is the end of the line that matters. For a road, a route or a place, the arrow points away from you, towards the south. For a wind, the same arrow has to be read backwards: the wind comes from the south. So the question to ask whenever you meet the word is a simple one - is this about where something is going, or about where it came from?
southerly 可以想成一支寫著「南」的箭頭。箭頭本身不說誰在動，只說南這個方向被牽涉進來。用在路線和位置上，箭…更多收起
southerly 可以想成一支寫著「南」的箭頭。箭頭本身不說誰在動，只說南這個方向被牽涉進來。用在路線和位置上，箭頭朝外指：往南走、在最南邊。用在風上，同一支箭頭要反過來讀：風是從南邊來的。英文的風名都照這個規矩，因為站在地上的人最在意的是風從哪裡吹來、帶什麼空氣過來。所以每次看到這個字，先問一句：這裡講的是去的方向，還是來的方向。From the word’s history
Wiktionary gives the word as souther + -ly, the same -erly ending found in northerly, easterly and westerly - a family of words that name a direction.
字典把 southerly 拆成 souther ＋ -ly，也就是 south 再加上講方向的 -erly 字尾。northerly、easterly、westerly 是同一家，所以它們的規矩也一樣：講風的時候指來處，講路線的時候指去處。
Wiktionary entries for southerly, packet etymology_text: "From souther + -ly."
Two branches
風的來向
同一支箭頭要倒過來讀：名字指的是風的起點，不是終點。
adjective · B2
A southerly wind is a wind that blows from the south. The word names where the wind starts, not where it is going.
（風）從南邊來的