Verb conjugation of "convulsionar" in Spanish

I ordered a cab at four o'clock in the morning which took me to the Central Bus Station. I was much to early because the bus would go just at seven o'clock. Anyway I was sitting there and listening to music.
I told them that in Europe not everything was perfect. I told them that there were also very dark times in that continent and that even in peaceful times live was not always easy as they had thought.
Police cars drove around the town and called all citizens and tourists to leave the island immediately. I was told, that the hurricane which was supposed to go over Cuba was on the way to us.