Strong updrafts—currents of rising air—in severe thunderstorms are a prerequisite for hail formation. The width of these updrafts may be an indicator of an increased hail threat, according to Penn State meteorologists.
Strong updrafts—currents of rising air—in severe thunderstorms are a prerequisite for hail formation. The width of these updrafts may be an indicator of an increased hail threat, according to Penn State meteorologists.