Translation of veinteavo

The machine arrived in Cuba at nine and it was already dark. The border control was nothing like the one in Mexico. They were communist and one could see the strictness and uneasiness of them.
The sky was dark blue and this is what my sister had told me many years ago when she was there. One of the reasons for that was the altitude of the city, I recall to be it above 2000 meters.
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.