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Warning Indication
A Warning Indication occurs when either a far lightning strike or a low electric field is detected. Far
lightning strikes are defined as lightning events that occur within a radius of approximately 10 to 25.km
of the sensor. Low electric-field events are defined as being when the local electric field rises above a
level of 3kV/m. A Warning status provides the user with an indication that a storm is within a relatively
close range and may move towards the area where the sensors are stationed. When a storm is within
25.km it may arrive in the area in approximately 20-40 minutes.
Page 6
10 - 25 km
LPI
Sensor
Assembly
• LWS activates warning when
lightning is within 10 -25 km
• Typically 20-30 minutes warning
• External siren can be sounded
if required
Warning Status
Document 36 II LWS-MKIII, pub V5 © Copyright 2012 LPI
Established
storm front
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