A great lightning pic from Texas

[Ivan Seeking]

Compliments of Coast to Coast AM
http://www.coasttocoastam.com/gen/page474.html

http://www.coasttocoastam.com/timages/page/storm0511a.jpg

http://www.coasttocoastam.com/timages/page/storm0511b.jpg

 

[Monique]

How about the following I once found on photo.net, the formation is called a mothership and this was shot in Australia, probably a moment before a tornado touched down..
http://home.student.uva.nl/monique.vandervoet/storm.jpg

 

[zoobyshoe]

Speaking of lightning, I looked up the cause of thunder for another thread, and found out that the conventional explanation of the expansion of superheated air is in dispute:

"J. Phys. D: Appl. Phys. 22 (14 August 1989) 1083-1094
The cause of thunder
P Graneau
Center for Electromag. Res., Northeastern Univ., Boston, MA, USA
Abstract. The cause of thunder is one of the oldest riddles of recorded scientific speculation. Three centuries BC Aristotle published the first thunder theory. Many other theories were proposed until at the beginning of the present century a consensus evolved which assumed thunder must begin with a shockwave in air due to the sudden thermal expansion of the plasma in the lightning channel. The only experimental support for this theory came from spectroscopic temperature determinations up to 36000 K. Any one of the assumptions made in equating 'optical' to thermodynamic temperatures can be challenged and some have been disputed. Experiments with short atmospheric arcs of lightning strength revealed average arc pressures in excess of 400 atm and peak pressures approaching 1000 atm. These results demand much higher temperatures than those found by lightning spectroscopy. Furthermore, when the strength of the short arc explosions was plotted against the action integral of the current pulse it followed an electrodynamic law rather than a heating curve. Arc photography then proved conclusively that the plasma did not expand thermally in all directions, but preferentially at right angles to the current, as if driven by organised electrodynamic action. Possible electrodynamic forces which might drive the thunder shockwave are the Lorentz pinch force, the longitudinal Ampere force and the alpha-torque force of the Ampere-Neumann electrodynamics. The pinch force was found to be far too small and in the wrong direction to be the cause of thunder. Longitudinal and alpha-torque forces act in the correct direction but, so far, quantitative agreement has not been achieved. This may have to wait for a complete Ampere MHD"

The cause of thunder
Address:http://www.iop.org/EJ/abstract/0022-3727/22/8/012/

 

[Ivan Seeking]

Not nearly so dramatic as Monique's pic, these unusual clouds were seen just before some tornadic activity in the Midwestern US.

Mammatus Clouds

These rare clouds (see below) appeared above our St. Louis, Missouri home just prior to a thunderstorm, early evening on 5/6/03. Mammatus are appendages that protrude from the bottom of strong cumulonimbus clouds (the tallest type of clouds), and are indicative of water weight.

--Steve Gilmore
gpdco@swbell.net

http://www.coasttocoastam.com/timages/page/mclouds1x.jpg
http://www.coasttocoastam.com/timages/page/mclouds2x.jpg

Again, from coasttocoastam.com

http://www.coasttocoastam.com/gen/page139.html

 

[Ivan Seeking]

a couple of side notes:

As for Zooby's post, this all relates to our other discussion about spark gaps - the evolution of lightining is also a bit of a mystery. I know I have a book that talks about this but I haven't found it yet.

Monique, that is an awesome shot!

Finally, Tsu and I used to hang a bit with an ER doc [Mark] who happened to have a BS in physics. Mark and I were talking about lightning one day and I pointed out that in principle, if one was to wear an appropriately constructed metal suit, a person could take direct hits by lightning will no ill effects.

Mark wanted to try it!

This is the same guy that threw his kids into the car and rushed over to the coast to experience some 90 mph winds.

 

[Evo]

How about the following I once found on photo.net, the formation is called a mothership and this was shot in Australia, probably a moment before a tornado touched down..

Now that is scary! :surprise:

(so happy to have the old smilies back)

 

[zoobyshoe]

I saw mammatus clouds in Minnesota once. "Mammatus" means "breast shaped".

 

[Tsu]

I saw mammatus clouds in Minnesota once. "Mammatus" means "breast shaped".

What's with your recent 'breast' fixation, Zoob? :surprise:

 

[Math Is Hard]

What's with your recent 'breast' fixation, Zoob? :surprise:

I guess Zoobies like Boobies.

I loved those storm pics. I was just back in Houston a few weeks ago and I got to experience some of the magnificent thunder and lightning storms that I have missed living out here in So. Cal for the last 10 years.

 

[zoobyshoe]

What's with your recent 'breast' fixation, Zoob? :surprise:

"Mammatus clouds only occur in the vicinity of severe thunderstorms and supercells.
They are named after 'mammaries' because of their peculiar 'mammary'-like appearance."

Mammatus Clouds
Address:http://www.john-daly.com/TwistedPhotos/albums/album9030305051414110131/

 

[Ivan Seeking]

...similar in their naming convention to the Altocumulus Testicularis formations.

 

[jimmy p]

Meteorologists must see some weird breasts...

 

[Tsu]

"Mammatus clouds only occur in the vicinity of severe thunderstorms and supercells.
They are named after 'mammaries' because of their peculiar 'mammary'-like appearance."

Mammatus Clouds
Address:http://www.john-daly.com/TwistedPhotos/albums/album9030305051414110131/

That's your answer? :smirk:

 

[zoobyshoe]

That's your answer? :smirk:

What's my answer? After the mammatus clouds appeared over Minneapolis there was an article about them in the paper the next day that explained what they were, and the origin of the name. Mammatus = mammary.

Latin Word Lookup
Address:http://catholic.archives.nd.edu/cgi-bin/lookup.pl?stem=mamma&ending=tus

 

[Tsu]

What's my answer? After the mammatus clouds appeared over Minneapolis there was an article about them in the paper the next day that explained what they were, and the origin of the name. Mammatus = mammary.

Latin Word Lookup
Address:http://catholic.archives.nd.edu/cgi-bin/lookup.pl?stem=mamma&ending=tus

Never mind, Zoob. Go back to sleep...

 

[Ivan Seeking]

More Zooby Clouds

Some cool mammatus clouds from Mexico last month.
http://antwrp.gsfc.nasa.gov/apod/ap040607.html

 

[BoulderHead]

How about the following I once found on photo.net, the formation is called a mothership and this was shot in Australia, probably a moment before a tornado touched down..
http://home.student.uva.nl/monique.vandervoet/storm.jpg

[/URL]
That is an awesome photo, Monique. It's like the revenuers coming to town...

 

[Miles]

Is that photo from photo.net for real??!? If so what's the name of that formation, I would like to learn more about it.

 

[Pattielli]

That looks terrible ! but i believe it to be a true one !

 

[Monique]

Is that photo from photo.net for real??!? If so what's the name of that formation, I would like to learn more about it.

It's called a mothership cloud formation seen during heavy storms.

 

[Monique]

Here is the URL where I found it :) http://www.photo.net/photodb/photo?photo_id=2326231

There is another amazing shot on that page:
http://www.photo.net/general-comments/attachment/1499093/hurricane.jpg

 

[Ivan Seeking]

That looks like something from the movie The Philadelphia Experiment.

Very cool Monique! :tongue2:

 

[zoobyshoe]

That looks like something from the movie The Philadelphia Experiment.

It does, but the line that came to me was from another film: I can just imagine the first mate ringing up the captain and saying "I think we need a bigger boat."

 

[Ivan Seeking]

:rofl: :rofl: :rofl:

That hit my funny bone! I nearly spit coffee all over my laptop!

A news flash just in from the netherworld: Alien motherships are the cause of large thunderstorms.

 

[check]

Ooo very nice. It's hard to get good lightning pics, or any good weather pics for that matter. It took me about an hour and about 20 tries to get this one.

 

[zoobyshoe]

I nearly spit coffee all over my laptop!

Evo reported the same sort of near-calamity once from something I said. Someday, I vow, I will get someone to destroy an expensive computer.

 

[DarkAnt]

Its thundering and lightning right now. Doesn't look nearly as cool as those pics though =(

 

[Ivan Seeking]

More Zooby clouds

http://www.coasttocoastam.com/timages/page/cotton_candy_sky_lg.jpg

http://www.coasttocoastam.com/gen/page516.html

 

[chroot]

The bay area has no interesting weather. :( We have fog, but I'm really not sure if you can call that "weather." It's certainly not interesting anyway, unless you happen to be flying through it in a small aircraft.

- Warren

 

[Nec]

Here is the URL where I found it :) http://www.photo.net/photodb/photo?photo_id=2326231

There is another amazing shot on that page:
http://www.photo.net/general-comments/attachment/1499093/hurricane.jpg

[/URL]
looks like perfect storm

 

[Ivan Seeking]

unless you happen to be flying through it in a small aircraft.

- Warren

I really like the new commuter jets. Landing in stormy weather in one of these little jets would make for a respectable Disneyland ride. :surprise:

 

[Werdatothewise]

Compliments of Coast to Coast AM
http://www.coasttocoastam.com/gen/page474.html

http://www.coasttocoastam.com/timages/page/storm0511a.jpg

http://www.coasttocoastam.com/timages/page/storm0511b.jpg

[/URL]


I too live in Texas - did anyone see that vibrant rainbow last week Thursday? I was ready to trail it for the pot of gold! ~Werdas

 

[zoobyshoe]

The bay area has no interesting weather. :( We have fog, but I'm really not sure if you can call that "weather."

Mark Twain once said something like: "The coldest winter I ever spent in California was a summer in San Francisco."

Is that true or was he grossly exaggerating how cool the summers are?

 

[Njorl]

Compliments of Coast to Coast AM
http://www.coasttocoastam.com/gen/page474.html

http://www.coasttocoastam.com/timages/page/storm0511a.jpg

http://www.coasttocoastam.com/timages/page/storm0511b.jpg

[/URL]

So what is the vertical line in the center, and thosered things?

Njorl

 

[chroot]

Mark Twain once said something like: "The coldest winter I ever spent in California was a summer in San Francisco."

Is that true or was he grossly exaggerating how cool the summers are?

San Francisco itself has a number of microclimates. Depending upon what neighborhood you live in, you might enjoy either perpetual fog or perpetual sunshine. It's never really cold, in the sense that people in Minnesota would say it's cold -- it rarely gets below 50F even in the dead of winter.

I live a bit south of SF on the peninsula. Here, the weather is just about perfect -- 80F highs in the summer, 50F lows in the winter, sunny nearly all the time. If you don't like the weather in your part of the bay area, just drive 15 minutes.

- Warren