TCD MS 10516 folio 81 verso
[12th October 1916] be a wind of high velocity; secondly, in contrast with the blizzard, there must be an intense heat; thirdly in place of snow, the atmosphere must be laden with driving sand. Thus can be compared the blizzard and the dust-storm; each depends on the same type of physical factor, though greatly differing in degree. In each the wind must be above a definite velocity; in each the temperature must pass beyond a definite extreme; in each a fine, dry, powdery substance must be suspended in the atmosphere and driven before the storm with a terrific blinding force
Dust in atmosphere. The prevailing wind in summer is from the north. It is a fresh and vivifying breeze, blowing sometimes with great intensity. The heavens are dimmed with the great