Update: Scim sez, "In the post the clouds were called 'lenticular mammatus', which I don't think it a real term, though each term by itself is a real cloud name. Lenticular clouds, meaning lens shaped, are rounded and have been mistaken for UFOs before. Mammatus clouds are called such because the hanging pouches of the clouds resemble mammary glands (like a cow's udders)."
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.