Lightning is a deadly surge of electical current.
Ball lightning Glowing balls that move through the air. Downburst winds Downbursts blast down from a thunderstorm. Fog Fog can pose a serious threat to motorists. Hail Hail is a byproduct of raindrops that take a ride. Tornado researchers use a scale, known as the Fujita-Pearson Tornado Intensity Scale to rate the intensity of tornadoes.