A remarkable book on weather forecasting was published just one hundred years ago. Written by the brilliant and prescient applied mathematician, Lewis Fry Richardson, Weather Prediction by Numerical Process [1] was published by Cambridge University Press and went on sale in 1922 at a cost of 30 shillings (£1.50). With a print run of just 750 copies, it was not a commercial success and was still in print thirty years after publication. It was re-issued in 1965 as a Dover paperback. Cambridge University Press reprinted the book in 2007, with a foreword by Peter Lynch. Described as a second edition, it differs in no essential way from the 1922 edition.