By 11 p.m. ET, Oscar's maximum sustained winds decreased from 75 mph to 70 mph. Cuba's electrical grid collapsed on Sunday for the fourth time in 48 hours, marking a major setback in the government's efforts to quickly restore power to exhausted residents already suffering from severe shortages of food,

Cuba has had four electric grid collapses since Friday, and most of the country remains in the dark as slow progress is made to restore power.

Oscar, which the National Hurricane Center characterized as "very small," is the 15th named storm of the hurricane season.