[TowerTalk] Arc During Lightning Storm

K8RI on Tower talk k8ri-tower at charter.net
Fri Jun 23 20:36:19 EDT 2006

Interesting. Dave's response to this turned up 7 minutes before this 
original post.

>  A couple of times in my life I have been in a building during a lightning
> storm, as today, and I hear a "zap" arc-type noise during a close strike.

Around here I normally hear them as a "pop", or snap.  Lightning a mile away 
can induce as much as a 1000 volts per meter in conductors. If the 
conductors are not grounded or do not use the same ground this sound is 
quite common.  With a single point ground consisting of 32 ground rods and 
over 600 feet of bare #2 I've not heard that phenomona since the ground 
system became operational.

Roger Halstead (K8RI and ARRL 40 year Life Member)
N833R - World's oldest Debonair CD-2

> Today I was in a garage during a storm and we had a close strike, but not
> terribly so, and I heard a loud "zap". All the ac circuits and telephones
> worked afterward (there were no external antennas, etc.) What am I 
> hearing?
>                                                   Mike  W2LO
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