Boltek Lightning/2000 - Manual (Page 92)

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Negative CG Percent Counter
There are no alarms associated with the –CG percent counter.
Record kept: No
The negative CG percent counter shows the
percentage of -CG (negative cloud-to-ground) strokes
compared to the number of CG strokes in the last
minute.
For example, if the CG stroke rate is 40 and the –CG
stroke rate is 20, then this counter would indicate
“50%”.
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.
-CG strokes are the more common type of CG stroke.
This counter is not used with the LD-250.
The Stroke Rate Counters
The alarm levels of the stroke rate counters are set by default
so that yellow alerts can be triggered by storms that are still
moderately far away. Red alerts on these counters will not
normally be triggered until a storm is either fairly nearby, or is
extremely intense and more distant.