The first use of the expression was supposedly by one Thomas Carlyle in 1837 when he was writing about the French Revolution period. He wrote " Arrest, sudden like a bolt out of the blue, has hit strange victims".
I discovered today that lightning can come out of a thundercloud and travel as much as 25 miles before striking the ground, seeming to come out of a blue sky! And why is the sky blue? Something to do with the earth's atmosphere particles bending the white light from the sun, separating the smallest wavelength of light out, that being blue. In the evening or morning, the angle of the sun changes, then the longest wavelength shows, red. If you go out beyond the earth's atmosphere, the sky is black, e.g. if you stood on the moon.
|The Ogre of Munson Mountain?|
|Approaches to Munson Mountain ( "digital painting" )|
Today the sky here is blue, there are no clouds, and the air is still. It is expected to go up to 32 degrees Celsius. So we will be on the look out for bolts, not sheets or forks.....