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Some lightning originates in the cirrus anvil or upper parts near the top of the thunderstorm, where a high positive charge resides. These bolts are known as "positive lightning" because there is a net transfer of positive charge from the cloud to the ground.
Positive lightning makes up less than 5% of all strikes. However, despite a significantly lower rate of occurrence, positive lightning is particularly dangerous for several reasons. Since it originates in the upper levels of a storm, the amount of air it must burn through to reach the ground usually much greater.
Therefore, its electric field typically is much stronger than a negative strike. Its flash duration is longer, and its peak charge and potential can be ten times greater than a negative strike; as much as 300,000 amperes and one billion volts!
To discover about more about lightning, go to JetStream - an Online School for Weather.