Strong thunderstorms form large, dense masses of bright white cloud in this MODIS/Terra satellite image taken the afternoon of June 18, 2010. One area of cloud obscures the location of the leaking Macondo well, source of the ongoing BP / Deepwater Horizon oil spill in the Gulf of Mexico. However, oil slicks and sheen are apparent through breaks in the cloud, covering at least 11,278 square miles (29,210 km2). Oil appears to be making landfall along the beaches of Perdido Key, Alabama, and east along the coast to Destin, Florida. Oil slicks also seem to occur within Pensacola Bay. Compare with MODIS/Aqua image taken the next day, on June 19.