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Um , "slightly" off topic but there is a world wide march against Monsanto tomorrow. https://www.rebelmouse.com/MarchAgainstMonsanto/

 <a href=https://www.rebelmouse.com/MarchAgainstMonsanto/" >


Oh, Jeez, sorry for that. I hit post instead of preview. I couldn't get typepad to reduce the image and was playing with the HTML.

Nevin, if you want to edit or remove this post, no worries. It is, ahem, "slightly" off taopic anyways.


No prob, Fufu. Monsanto is always ontopic.

People who want to see the full image: right-click it and pick 'view image'.

Shared Humanity

Neven....thank you for linking to this article. I learned more about weather in the last hour than I've previously accumulated in 57 years.

Hans Gunnstaddar

Speaking of the jet stream getting stuck over Greenland, melt there has gotten off to a slow start in 2013, however take a look at it today! http://nsidc.org/greenland-today/

This is the first day of large scale melting and it shows on the graph on right, showing a sudden spike upwards in melt compared to the average bell curve.

Bob Bingham

The melting of the Polar ice and the changes it brings to the jet stream and the weather in Europe, Russia, China and the USA are, I believe, potentially the the fastest and most threatening tipping point there is. If the ice goes the weather is affected the same autumn and this leads to crop failure. My cousins are farmers in the UK and they are having a tough time now and it has hardly started,
I live in NZ now and we are affected less than most countries but we are not immune.

Aaron Lewis

John provides an excellent recitation of the conventional wisdom of modern weather theory. However, we know that modern weather theory does not always do a perfect job of predicting the weather. Weathermen claim natural variation, but there may be deeper reasons. For a very long time I have felt the conventional wisdom failed to adequately account for water vapor. See:

 Makarieva, A. M., Gorshkov, V. G., Sheil, D., Nobre, A. D., and Li, B.-L.: Where do winds come from? A new theory on how water vapor condensation influences atmospheric pressure and dynamics, Atmos. Chem. Phys., 13, 1039-1056, doi:10.5194/acp-13-1039-2013, 2013

The jet stream is wind. If you want to understand it, you have to (also)think about water vapor. Failure to fully address water vapor is another reason I am not happy with climate models.

This paper has been disparaged as having too much math. Weather (wind) is the internal work of a thermodynamic engine (Earth). And, math is the best language we have to describe thermodynamic processes.


In a former life, I taught Weather for the FAA Mandated annual Flight Dispatch Recurrent Training at a major airline. This is one of, if not the best overview of the jetstream and associated features I've ever seen, A little too advanced for the average Dispatcher - but as complete as any one of them would need.


If anybody would like a primer on the Coriolis force (mentioned in this piece and often misunderstood), there was an excellent and relatively short three part series in the journal 'Weather' in 2000 by Anders Persson. The links below provide links to the three free to download pdfs of the series, collectively titled 'Back to Basics.'
Part One
Part Two
Part Three

Espen Olsen

Reposted from Arctic Sea Ice Forum:

Petermann Fjord Map Update.

I have added loads of images to the Petermann Fjord Map, primarily the shore line of Hall Land (north eastern shore).
Most important localities from Hall´s Grave (in Nares Strait) to Kap Egedesminde (a the top of Petermann Glacier) are covered, and more will come, I recognize most of the images are from 1984, but as the skeptics tells us it hasn't changed much ;), newer images is supplied by Andreas Muenchow who visited the area in 2012.
Some unofficial names are supplied by me, like First One To The Left Glacier, The Parallel Glaciers, Sankt Peders Vej Glacier, Hellerupvej Glacier(named after some streets in Hellerup, a district in the suburb of Copenhagen, and since both glaciers are located in Hellerup Land I find both names appropriate), Between A Rock And A Hard Place Glacier.

I also like to draw your attention to the inland calving that happened in 1984 or probably earlier, it is called Inland Calvin Site on the map and it is located between the tops of Steensby Glacier and Ryder Glacier in N. P. Johansen Land. It is an impressive piece of demolition work, to say it at least.

Please come and explore at:

Kevin McKinney

Thanks for the Coriolis primer, Phil! I was aware of the insufficiency of the "Hadleian" explanation (which I learned decades ago from a prominent Canadian meteorologist, then my father-in-law), but didn't have a more sufficient replacement.

The lack was an infrequent, yet recurring, annoyance!


Glad it was of interest Kevin. I thought the pieces were well written and clear; and I always appreciate historical context.

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