Outbreaks of violent weather (6)
I believe the answer is:
storms
'outbreaks of violent weather' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for storms that I've seen before include "Tempests" , "French Mediterranean coast" , "Weather periods with force 10 winds" , "Outbreaks of violent weather" , "Violent weather conditions" .)