Hurricane Maria weakens to Category 4 storm but still extremely dangerous

Hurricane Irma is driving toward Florida passing the eastern end of Cuba in this NASA's GOES-16 satellite image taken at about 0800 EDT on September 8, 2017. Courtesy NOAA National Weather Service National Hurricane Center/Handout via REUTERS

​Forecasters say Hurricane Maria weakens slightly, down to Category 4 storm but still extremely dangerous.