Boltek Lightning/2000 - Manual (Page 85)

R E A L - T I M E L I G H T N I N G D E T E C T I O N
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Default red alert trigger level: 10
Record kept: Yes
The IC flash rate counter shows the number of
intercloud flashes in the last minute.
Each flash is composed of at least one stroke, but IC
flashes have been observed to be comprised of 30 or
more strokes during nearby storms.
A new record value is denoted by swapping the colors
of the counter and the background.
This counter is not used with the LD-250.
Negative IC Flash Rate Counter
The -IC flash rate counter, shown with and without an alert bar.
Default yellow alert trigger level: 25
Default red alert trigger level: 100
Record kept: Yes
The -IC flash rate counter shows the number of
negative intercloud flashes in the last minute. A
correlation between –IC flashes and storm severity
has been observed.
Each flash is composed of at least one stroke, but IC
flashes have been observed to be comprised of 30 or
more strokes during nearby storms.
A new record value is denoted by swapping the colors
of the counter and the background.
This counter is not used with the LD-250.