The magnitude of the impact remained unclear through the early hours of the day, but forecasters warned that Hurricane Rafael could bring “life-threatening” storm surges, winds and flash floods to Cuba after ravaging parts of the Cayman Islands and Jamaica.

Hurricane Rafael has turned to the west after lashing Cuba, where it knocked out the country’s electrical grid, leaving its 10 million residents in the dark. Rafael had strengthened to a Category 3 hurricane before it made landfall in the Cuban province of Artemisa, and weakened to a Category 2 shortly after making landfall Wednesday afternoon.