Boltek Lightning/2000 - Manual (Page 102)

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At least 10 CG strokes per minute, both currently and
one minute ago, must occur for the yellow or red alert
to be triggered.
This counter is not used with the LD-250.
Positive CG Stroke Rate Change
Counter
The +CG stroke rate change counter, shown with and without an alert bar.
Default yellow alert trigger level: 25
Default red alert trigger level: 50
Record kept: No
This counter shows the percentage change in the
+CG (positive cloud-to-ground) stroke rate between
one minute ago and now.
If the stroke rate one minute ago was zero, and the
current stroke rate is zero, "--" is displayed. If the
stroke rate one minute ago was zero, and the current
stroke rate is non-zero, "*" is displayed.
A sudden change in the +CG stroke rate may signal a
change in the character of a storm and could indicate
behavior that needs to be monitored.
When you specify a trigger level for the red or yellow
alert, you are specifying the percentage change that
must occur if the +CG stroke rate is 100 strokes per
minute. The percentage change that is needed for
alert status at higher stroke rates is somewhat lower,
and the percentage change that is needed for alert
status at lower stroke rates is higher.