ESS5
Prof.
Jin-Yi Yu
Negative
and Positive Lighting Strokes
q Most of the lighting are negatively charged cloud-to-positively charged ground (negative lighting).
q But there are also positively charged cloud-to-negatively charged ground (positive lighting).
qWhen high-level winds
are strong, thunderstorm
clouds become tilted and
produce the positive lighting.
q The positive lighting can be twice as strong as the negative lighting.