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A hailstone of more than four inches is “certainly very large,” says Matthew Kumjian, a meteorologist at Penn State University.

Rachel Gutierrez, a graduate student at Penn State and co-author of the paper, found a connection between a storm updraft’s rotational velocity, or how fast it is spinning, and larger hail size.

A good grip can mean the difference between life and death for lizards in a hurricane.

Michael Mann has been elected to the National Academy of Sciences.

After tornadoes hit his southwestern Pennsylvania hometown in 1998, 9-year-old Kyle Imhoff learned a few things. Weather events could be very dangerous — but also fascinating.