How to Make A Hailstorm

PHOTOGRAPH BY TAJ FORER FOR BLOOMBERG BUSINESSWEEK

1 Use rubber molds to freeze water into hailstones measuring 1, 1.5, and 2 inches

2 Calibrate hail cannons to fire the frozen stones at the same speed as a storm

3 Construct shingled test roofs to study the effects of age on the materials

4 Pit a test house against the premade hailstones in 40-mph winds

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