Boltek Lightning/2000 - Manual (Page 232)

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During the dissipating stage of thunderstorms the lower
negative charge may have been mostly removed by –CG
strokes leaving the main positive charge. At this stage of the
storm there will be a larger number of +CG strokes than –
CG strokes. This condition is shown in figure 5.
The primary stroke types in well-developed thunderstorms
with charge distributions shown in figure 1 are +IC and –CG.
Even at close range a sizeable percentage of the IC strokes
will not be detected due to the orientation of the stroke
channel. And at larger ranges the smaller signal of IC strokes
will prevent their detection. At very large distances it may not
be possible to detect any IC strokes.
The –CG strokes will be concentrated near the convective
core (updraft) of the storm cell. The +IC (and –IC
discussed in the next section) strokes will be more spread out
and most likely occupy a major part of the volume of the