Cloudy
The sun is being blocked by a rain cloud, making it cloudy.
None
くも
None
Remember 雲? It means "cloud" and has the same reading as "cloudy," making them both くも.
An update is needed before you can continue but you have more than one WaniKani tab open.
Finish up what ever you are doing on the other tab(s), then close them to continue.
The update will complete automatically once the other tab(s) are closed.