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How Dangerous Is Hail?

Can a grapefruit-size ice ball kill you?

(Continued from Page 1)

Explainer thanks Randy Cerveny of Arizona State University and Charles Knight of the University Corporation for Atmospheric Research. Thanks also to reader John Lilly for asking the question.

Correction, Dec. 13, 2009: This article originally misspelled the name Venango County, Penn. (Return to the corrected sentence.)

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Daniel Engber (@danengber) is a columnist for Slate. Send him an email at danengber@yahoo.com.

Photograph of hail by NOAA Photo Library.