Sudden jump in a storm's lightning might warn a supercell is forming

A sudden jump in the number of lightning strikes inside a garden-variety thunderstorm might soon give forecasters a new tool for predicting severe weather and issuing timely warnings, according to new research. The sudden increase in lightning is one sign a normal storm is rapidly evolving into a supercell, with a large rotating updraft -- or mesocyclone -- at its heart.

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