OCR Text |
Show Cause of Hailstorms The stones which fall during ordinary ordi-nary hailstorms measure from one. eighth to one-half Inch In diameter, their size depending upon the violence of the upward columns of air that produce pro-duce them. Hall, like rain, Is caused by the vertical circulation of the air. Rain Is formed by the condensation of drops of moisture In cooling air which grow larger as the air rises until they are heavy enough to fall. Each of the drops rises end falls at least once. Hail, which Is frozen rain, is caused by the drops being tossed higher. |