Sunday, 2 September 2012

"Freak tree explosion kills herd of Kent cows"

Spotted by Julia M in Kent News:

A farmer is counting the cost after a freak bolt of lightning caused a tree to explode, killing a herd of cows sheltering from the storm beneath it. The farmer, who did not want to be identified, confirmed the cattle were all killed by the act of nature at the farm in Shepway.

Speaking to our reporter they said: “It killed the lot. It’s very upsetting.”

A source within the agricultural industry explained: “About nine cows were killed in one go. The herd had been sheltering under the tree and then it just exploded because it was struck by lightning. Tree trunks can explode if struck by lightning when the sap is exposed to an extreme heat and becomes high-pressure steam. It literally makes the tree blow up.”

Although tree explosions are rare, it happens more if the trunk is in a rotten state.

National Farmers’ Union livestock adviser for the south east, James Osman, said: “This incident is clearly very upsetting for the farmer involved, although it is a freak natural occurrence. Cattle are known to sometimes shelter under trees during bad weather; however,it is important to note that situations like these are extremely rare.”

Texas A&M University agricultural expert Brent McRoberts added: “Unless there is a barn nearby, livestock are out in the open during thunderstorms, so their chances of being hit are greater.”

Some 19 cows also died recently whilst hiding under a tree during a heavy storm in Canada, and a herd of 16 bullocks were killed under the shelter of trees in East Lothian in 2009.


It must be one hell of a bang to create enough splinters to kill all those cows in one go. It's not really a cow attack story, rather the reverse, but wonderfully gruesome nonetheless.

6 comments:

Bayard said...

It's not the splinters that kill the cows, but the electricity. When the lightning strike hits the foot of the tree, that area is briefly at a voltage of several thousand volts relative to the rest of the field away from the tree. The voltage gradient away from the tree is steep enough to generate a voltage between the front and back legs of the cows high enough to drive a current through their hearts large enough to kill them.

Mark Wadsworth said...

B, that's the question isn't it? Why do all the people quoted in the story explain how and why trees can explode if it wasn't that which killed the cows?

View from the Solent said...

One thing puzzles me. Why would a regional Kent newspaper go to a Texas A&M guy for a comment?

Mark Wadsworth said...

VFTS, they just pinched that quote from something he said over a year ago when being interviewed on the topic.

Bayard said...

Mark, probably because, as bipeds, we are relatively safe from steep voltage gradients, but much more likely to be killed by flying splinters. So the "advice" is aimed at humans, not cows (who probably don't read the Kent News anyway).

JuliaM said...

"So the "advice" is aimed at humans, not cows (who probably don't read the Kent News anyway)."

Oh, I don't know. I'd need to check the comment section to be sure.. ;)