Hurricane Kirk was strengthening over the central Atlantic as a category three hurricane on Thursday, October 3, the United States’ National Hurricane Center (NHC) said.Satellite footage released by CSU/CIRA & NOAA shows the storm on Thursday.No warnings or watches were in effect on Thursday morning, the NHC said, but large swells from Hurricane Kirk could reach the US east coast by Sunday. Credit: CSU/CIRA & NOAA via Storyful