Earth observation taken by the Expedition 43 crew

ISS043E187158 (05/10/2015) --- This image of ominous clouds over parts of the USA was taken by the crew of the International Space Station on May 10, 2015. NASA astronaut Scott Kelly found them interesting and tweeded this warning along with the picture: "These dark clouds in the US heartland look very threatening. Be safe! #wxreport #YearInSpace".