If a tsunami hits while you're farming, you'll have to wear really thick clothes to deal with it. The water is thick with fish and cars and other ripped-up debris too, which makes it even harder.
You knew to put on your thick tsunami-proof farming gear because Nostradamus (のう) warned you it was coming. He sent a message to your brain yesterday so you'd know what to wear today.
Currently there are no similar looking kanji which exist in the WaniKani learning system