A bolt from the blue is a form of lightning that strikes out of an apparently cloudless sky. In fact, it actually originates from the anvil cloud atop a thunderstorm which may be as far as thirty miles away. It carries around ten times the current of an ordinary bolt of lightning and has a positive charge while most other lightning has a negative one. This commonly is known as positive lightning.
Sparkling, strident, sometimes immortal ; A Bolt from the Blue and Other Essays. By Mary McCarthy, edited by A.O. Scott. New York Review of Books, 389pp. (pounds) 16.99
Feb 01, 2003; In 1963, introducing a collection of her theatre criticism, Mary McCarthy quoted the views of "an insufferable little-magazine...