Boltek Lightning/2000 - Manual (Page 90)

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As a storm approaches, the percentage of IC strokes
will typically rise.
-IC strokes are the less common type of IC stroke
detected. A preponderance of –IC stroke versus +IC
strokes is a trait commonly associated with severe
storms.
When running Lightning/2000 in flash mode, this
counter shows the percentage of -IC flashes, rather
than strokes.
At least 10 IC strokes per minute must occur before
the red or yellow alert is triggered.
This counter is not used with the LD-250.
CG Percent Counter
The CG percent counter has no alarms associated with it.
Record kept: No
The CG percent counter shows the percentage of CG
(cloud-to-ground) strokes compared to the total
number of strokes in the last minute.
For example, if the stroke rate is 100 and the CG
stroke rate is 75, this counter would indicate “75%”.
CG strokes can be detected from storms at any
range, and have been detected from storms over 600
miles (1000 km) away.
When running Lightning/2000 in flash mode, this
counter shows the percentage of CG flashes, rather
than strokes.
This counter is not used with the LD-250.