''Sévère'' in French would mean ''Severe'' or ''Harsh'' in English.
Severe or important.
No. That would be a severe thunderstorm watch. A severe thunderstorm warning means that a severe thunderstorm ha already formed.
It does not mean anything in French.
There is no such word in French. If you mean "explorer", it is French for "to explore". If you mean the English noun "explorers", the French translation is "explorateurs".
route mean road in french
winter mean hiver in french
It mean 27 in french