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  #41  
Old 15.07.2009, 16:44
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Re: Lightning Risk

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And why you are in danger if you are standing under a tree? Air is apparently a very good insulator. Assuming you are not touching any part of the tree of course
Thing is, you're touching the ground. Electricity goes down the tree, into the ground, and then dissipates into the ground - spreading out as it does so. If you're within 30 feet or so, you can get a good shock. (I remember reading about a strike in Denmark a few years back that hit a tree and also killed a couple dozen dairy cows who were standing around under the tree.)

Of course there's also the danger of the tree splitting, falling on you, catching fire, etc....
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  #42  
Old 15.07.2009, 16:51
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Re: Lightning Risk

Ladies beware (and men if you are that way inclined)

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The underwire of a bra has played a part in various accidents and attacks. Metallic underwires, which attract and conduct electricity, can put a woman at risk of burning or death during electrical storms and lightning strikes.
So sayeth the Wiki...
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  #43  
Old 15.07.2009, 16:56
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Re: Lightning Risk

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Ladies beware (and men if you are that way inclined)
So sayeth the Wiki...
SO no ring, jewlery, watch, necklace, piercing, keys, umbrella, ...
What a boring life!
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  #44  
Old 15.07.2009, 16:56
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Re: Lightning Risk

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I rather enjoy storms, and, so long as they're not directly overhead, don't mind being outside in them.

But I just read this page of lightning safety advice and am beginning to wonder.

How much of this should I take seriously? Is lightning really dangerous up to 30 minutes after the storm has passed? Is the advice to stay indoors if you can hear the thunder less than 30 seconds after the lightning just a tad overcautious?

Has anyone got any lightning horror stories they wish to share?
Mate don't take them seriously. infact use a long extension cable. Go outside with it. stand in a large puddle with a hairdryer... When lightening strikes. After you are hit apparently you will hear what women think... Let me know if it works as I will hire you to find out some secrets from certain women. Specially my mother in law. Maybe you could even hear angels speak and they might mention when the beatch will die!!!
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  #45  
Old 15.07.2009, 16:58
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Re: Lightning Risk

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SO no ring, jewlery, watch, necklace, piercing, keys, umbrella, ...
What a boring life!
What? Don't you keep your umbrella in your bra?

Must be just me, then...
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  #46  
Old 15.07.2009, 16:58
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Re: Lightning Risk

"The underwire of a bra has played a part in various accidents and attacks. Metallic underwires, which attract and conduct electricity, ...."

I am pretty confident without bra, there will be more attacks and accidents, beside more attracts and conducts
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  #47  
Old 15.07.2009, 17:06
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Re: Lightning Risk

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What? Don't you keep your umbrella in your bra?

Must be just me, then...
I C U here:
http://www.cherryflava.com/cherryfla...nderbra-u.html

Wonderbar!
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  #48  
Old 15.07.2009, 17:08
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Re: Lightning Risk

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Is that an answer to my question or just a clue ? :-) its all a bit cryptic....
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and the moisture in the air is a very good conductor when you have 1.21 giga watts of electricity on the loose
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And why you are in danger if you are standing under a tree? Air is apparently a very good insulator. Assuming you are not touching any part of the tree of course
I'd think less in terms of such rather lame, tame, limp-wristed
terms as air, water, wood and other conductors (good or bad).

I'd think more along the lines of a jet of plasma going past at, say,
200,000 km/h plus; maybe a temperature of, oh, 30,000 degrees C
(about 4-5 times hotter than the surface of the sun); and perhaps
a peak power of a terawatt (approx 1000 times the output of CH's
biggest nuclear power station).

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Bloody hell.
Quite.

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I'm never going outside again.

That's very good advice, but I suspect you'll completely ignore it.
.
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  #49  
Old 15.07.2009, 17:09
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Re: Lightning Risk

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That's very good advice, but I suspect you'll completely ignore it.
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  #50  
Old 15.07.2009, 17:30
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Re: Lightning Risk




"DB gets ready to install his WeeJeem (pat pend)
personal lightning protection system."
.
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  #51  
Old 15.07.2009, 17:35
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Re: Lightning Risk

Here's one lucky guy..


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  #52  
Old 15.07.2009, 17:37
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Re: Lightning Risk

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big antenna on the roof to get the best signal, direct conductor to the back of the tv: explosion of tv!
Same thing happened to a friends modem (dial up days) and computer!

P.S.
I can't say I'm Physics minded, but I'm pretty sure that you've got a fairly good chance of getting at least a decent shock if you're in the lake when lightning strikes.
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  #53  
Old 15.07.2009, 17:38
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Re: Lightning Risk

And the luckiest man alive, Roy C. Sullivan:

http://www.google.com/search?sourcei...oy+C.+Sullivan+
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  #54  
Old 15.07.2009, 17:40
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Re: Lightning Risk

Personally i think theyre being a little over cautious here typical of the nanny state the UK has become .

I vaguely remember watching a programme , where they experimented with a lightening strike on a car and the occupants were not affected.

My horror story about lightening is that one day i was out walking in a field during a heavy thunderstorm, the clouds were black, the wind was howling , lightening kept hitting the ground with ever increasing frequency , i actually felt nature talking to me saying get out of here now or you die, but i didnt get struk not even once and i lived to tell the tale




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I rather enjoy storms, and, so long as they're not directly overhead, don't mind being outside in them.

But I just read this page of lightning safety advice and am beginning to wonder.

How much of this should I take seriously? Is lightning really dangerous up to 30 minutes after the storm has passed? Is the advice to stay indoors if you can hear the thunder less than 30 seconds after the lightning just a tad overcautious?

Has anyone got any lightning horror stories they wish to share?
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  #55  
Old 15.07.2009, 17:48
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Re: Lightning Risk

I have a metal rod attatched am i at greater risk too ?



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You could stand out in an open field under a pine tree wielding a golf club, and you'd still have to be pretty unlucky to be hit by lightning.

Switzerland gets about 450,000 lightning flashes per year (BLIDS data from 2007). Only about 20% of those are cloud-to-ground - so 90,000 strikes per year over the whole country, or 2.18 strikes per square kilometer, per year.

95% of lightning here occurs during the months of May through August; say only 1/4 of those nights actually do have a thunderstorm near you (seems like a lowball estimate), then we're talking 0.072 strikes per square kilometer, per stormy summer night.

A lightning strike up to 10m away counts as a direct hit, more or less, so by standing out in the open you 'occupy' a circular zone of area 78.5 m^2. This means your odds of being hit by lightning if you stand outside all night on a stormy night are 5.7E-7: nearly one in two million.


Another way to look at it (specially for the number skeptics): has your house ever been hit by lightning? And your house stands outside all night every night, is several times bigger and taller than you are, and probably has a metal rod on top of it.
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  #56  
Old 15.07.2009, 18:06
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Re: Lightning Risk

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You could stand out in an open field under a pine tree wielding a golf club, and you'd still have to be pretty unlucky to be hit by lightning.

Switzerland gets about 450,000 lightning flashes per year (BLIDS data from 2007). Only about 20% of those are cloud-to-ground - so 90,000 strikes per year over the whole country, or 2.18 strikes per square kilometer, per year.

95% of lightning here occurs during the months of May through August; say only 1/4 of those nights actually do have a thunderstorm near you (seems like a lowball estimate), then we're talking 0.072 strikes per square kilometer, per stormy summer night.

A lightning strike up to 10m away counts as a direct hit, more or less, so by standing out in the open you 'occupy' a circular zone of area 78.5 m^2. This means your odds of being hit by lightning if you stand outside all night on a stormy night are 5.7E-7: nearly one in two million.


Another way to look at it (specially for the number skeptics): has your house ever been hit by lightning? And your house stands outside all night every night, is several times bigger and taller than you are, and probably has a metal rod on top of it.
Ah, if only it was a random distribution as you assume! Life would be so
much simpler and so much safer...

You overlook one or two teeny, teeny, teeny details: step leaders and
positive streamers.

The step leaders are sort of the plasma "feeling" its way for a discharge
path, and when they start to approach the surface, objects on the surface
(trees, brollies, BH wires, people, and so on...) start to extend positive
streamers up and towards the step leaders.

Once a step leader meets a positive streamer is when all hell breaks loose.

(There's a classic photo that I'll try to find - it's pretty spectacular. It
catches the moment where a number of leaders and streamers are just
about to meet. The photographer later realised that the photo included
a streamer from him that also extended forwards and upwards, and that
he had nearly taken a photo of his own demise... )

Executive summary:
If I'm in a open field with a pine tree, I'd rather be right in the open, far
away from the tree and with you under the tree wielding the proverbial
golf club. You're much more likely to take the hit than I am...
.
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  #57  
Old 15.07.2009, 18:19
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Re: Lightning Risk

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I vaguely remember watching a programme , where they experimented with a lightening strike on a car and the occupants were not affected.
cars are fine, they are in fact a faraday cage as far as the lightning is concerned i.e. the safest place to be

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  #58  
Old 15.07.2009, 19:02
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Re: Lightning Risk

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I wondered what would be the effect if the lightning hits the water and you are swimming ? because water conducts as we all know. So if you are swimming or paddling in the lake 2km from a lightning strike for example, what stops you getting electrocuted ?Mike
If a lightning bolt hits you on your head whilst you're swimming then you're toast. If it hits the water nearby then the charge spreads across the surface of the water (which does conduct) and if you're near enough to the strike you'll get BBQ'd. Being on in an open field or on open water are the two places you don't want to be in a thunderstorm. Lifeguards are told to clear outside pools in a storm.
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  #59  
Old 15.07.2009, 19:05
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Re: Lightning Risk

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I rather enjoy storms, and, so long as they're not directly overhead, don't mind being outside in them.... Is lightning really dangerous up to 30 minutes after the storm has passed?
Presumably somebody coined the phrase "bolt from the blue" for a reason
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  #60  
Old 15.07.2009, 19:15
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Re: Lightning Risk

Apparently the place to be is in a Boeing 747:
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