U-ka-ten-sei is an idiom made up of four kanji (Chinese characters); Rainy + passing + weather + sunny.
The wether clears up after raining. So, no matter how bad things are, they will be solved with time and turn for the better in the end.
Typhoons have gone. It is a cool and sunny day today.
It is bright in sunlight.
A duck was walking in the irrigation canal near my flat.
