Originally posted by gllowsticks

et uvær

  lit. an unweather

  n. a (bad) storm, a bad/severe weather

nynorsk: uvêr 

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”.