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,

Hurricane Oscar made landfall Sunday evening on the northern coast of east Cuba before it weakened to a tropical storm as it moved across the island, according to the National Hurricane Center.

The former Category 1 hurricane has weakened to a tropical storm after making landfall Sunday in eastern Cuba.