Jeg fikk ikke sove. Det var uvær som holdt meg våken. I couldn't sleep. It was bad weather weather that kept me awake.
Uværet kunne man høre fra kjelleren. One could hear the bad storm from the basement.
plural: uvær(same as the indefinite singular) definite: uværet definite plural: uværene
Note: when talking or writing about a storm, it’s more common to use the word “storm” than “uvær”. “Uvær” is a general word for bad or severe weather. It could just be thunder and lightning or just rain, and still be called “uvær”.