Positive cloud-to-ground (CG) lightning is a less common type of lightning that occurs when a positively charged region of a thunderstorm cloud connects with a negatively charged object on the ground. These types of lightning strikes can travel much farther from their origin than negative CG lightning, sometimes up to 10 miles.

The reason for this is that positive CG lightning starts with a stepped leader that travels down from the cloud towards the ground. This stepped leader is made up of a series of short, bright bursts of light that each extend a little bit farther than the last. As the stepped leader approaches the ground, it creates a channel of ionized air that acts as a path for the main lightning stroke.

The main lightning stroke is a much more powerful discharge of electricity than the stepped leader. It travels along the channel of ionized air that was created by the stepped leader and strikes the ground with a tremendous amount of force.

Because positive CG lightning starts with a stepped leader that can travel a long distance, it is able to strike objects that are much farther away from the thunderstorm cloud than negative CG lightning. These strikes can be very dangerous, and they can cause significant damage to property and infrastructure.

Here is a more detailed explanation of the process of positive cloud-to-ground lightning:

1. A positive charge builds up in the upper part of a thunderstorm cloud. This charge is created by the collision of ice particles and supercooled water droplets within the cloud.

2. The positive charge creates an electric field between the cloud and the ground. This electric field is strongest near the cloud and weakest near the ground.

3. A stepped leader travels down from the cloud towards the ground. The stepped leader is made up of a series of short, bright bursts of light that each extend a little bit farther than the last.

4. The stepped leader creates a channel of ionized air that acts as a path for the main lightning stroke.

5. The main lightning stroke travels along the channel of ionized air and strikes the ground with a tremendous amount of force.

Positive cloud-to-ground lightning is a less common type of lightning, but it can be very dangerous. These strikes can travel much farther from their origin than negative CG lightning, and they can cause significant damage to property and infrastructure.