Thunder
Lightning, Thunderbolt
noun
The kanji and the word are exactly the same. That means they share meanings as well.
かみなり
To remember the reading think about thunder. Back in the day, it was probably terrifyingly loud. Like the cry of the gods! Wait a sec, the "cry of the gods" would be 神鳴り (かみなり).
雷の音で、洗濯物を取り入れなくちゃいけないことを思い出しました。
The thunder reminded us that we had laundry to bring inside.