Questions & Answers about Jubelen var høy.
Because -en is the definite ending for many Norwegian nouns of common gender.
- jubel = cheering / jubilation / applause in a general sense
- jubelen = the cheering / the jubilation
So Jubelen var høy refers to a specific cheering sound, not cheering in general.
Var is the past tense of å være, which means to be.
- er = is / am / are
- var = was / were
So the sentence is in the past: The cheering was loud.