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  1. Hi all, While reading through many posts on here I became aware of the abbreviation PV. In the beginning, I thought it stood for polar vortex. However, I noted on further examination in a few scientific articles that the abbreviation PV was actually used for Potential vorticity (a measure for spinning motion in the atmosphere). Because I have used (possibly incorrectly) the abbreviation a couple of times referring to polar vortex, I have really begun to doubt which meaning is correct. Therefore, I would like to ask: Has anybody else noticed this misunderstanding in the abbreviation of PV? Or is it simply me who used the abbreviation in the wrong way? And secondly: What is actually the generally accepted meaning of the abbreviation PV? I hope it will help a little in taking away the possible confusion that developed amongside me (and possibly some other members as well). Very many thanks! Vorticity. Sources: http://en.wikipedia.org/wiki/Potential_vorticity http://trs-new.jpl.nasa.gov/dspace/bitstream/2014/33809/1/94-0540.pdf http://journals.ametsoc.org/doi/pdf/10.1175/1520-0469%281999%29056%3C2359%3ATDORWB%3E2.0.CO%3B2 (a scientific article about wave breaking in the atmosphere)
  2. During the last month or so, many different media resources have been talking about the "polar vortex". This has caused many confusion in the general public, as well as with some members here, as it seems. This caught my eye reading some of the posts on different places of the forum. Therefore, I thought it might be a sound idea start a new thread to help solving this confusion. For example, on Twitter, the following was posted: Courtesy to Lorenzo (for finding it) Moreover, many big news sites in the US have been hyping about this Polar Vortex, without actually explaining what it is. For example a link to a FOX article about this subject can be found below: http://www.foxnews.com/weather/2014/01/07/polar-vortex-spreads-into-eastern-southern-us/ Or an even crazier article, stating that the polar vortex is "dangerous": http://news.nationalpost.com/2014/01/05/dangerous-polar-vortex-expected-to-bring-record-setting-sub-zero-temperatures-to-more-than-half-of-the-u-s/ It seems like it is evolving toward a serious issue (if it has not already become one). To start with, some informative links about the Polar Vortex below: http://dutch.wunderground.com/blog/JeffMasters/comment.html?entrynum=2604 http://en.wikipedia.org/wiki/Polar_vortex I'll try to give a basic explanation later today or tomorrow, if possible. Any new contribution for explanation of the Polar vortex is greatly appreciated! BTW: If this has already been discussed, or if it is in the wrong place, please remove or replace it to another subforum.
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