Boltek Lightning/2000 - Manual (Page 94)

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Positive IC strokes are the more common type of IC
strokes.
A new record value is denoted by swapping the colors
of the counter and its background.
This counter is not used with the LD-250.
Negative IC Stroke Rate Counter
The –IC stroke rate counter, shown with and without an alert bar.
Default yellow alert trigger level: 30
Default red alert trigger level: 150
Record kept: Yes
The negative IC stroke rate counter shows the
number of -IC (negative intercloud/intracloud) strokes
that have been detected in the last minute.
IC strokes are more easily detected from relatively
nearby storms (within 250 km or 150 miles).
Negative IC strokes are the less common type of IC
strokes. A preponderance of –IC stroke versus +IC
strokes has been associated with severe storms.
A new record value is denoted by swapping the colors
of the counter and its background.
This counter is not used with the LD-250.
CG Stroke Rate Counter
The CG stroke rate counter, shown with and without an alert bar.
Default yellow alert trigger level: 40