Southern Hemisphere Forecast.
Page 2: The 27th of November 2013.
OK we got here at last.
I have had complaints about me not telling what I know in a readable way.
Part of my problem is that I don’t really care an awful lot about people. Another problem I had was that I learned to write long circuitous conversations designed to irritate the trolls that used to inhibit sci.geo.geology, until I had finally removed the…erm. Once I showed them they were do nothings that just liked to make noise designed to put off discussions about the subject (defeating the whole idea of Usenet) they all went away; leaving me with a writing style that is insulting and over-arch.
But let’s face it!
Do you deserve any better?
Be that as it may; one thing you will thank me for is a diligent use of paragraph spacings. However I can’t tell if the fonts that allow me to speak here, mirror my requirements in that regard.
I wouldn’t want the Aussies upset with me pilfering their goods, so here is some bumph for you to ignore; please skip to the next image unless you are like me, inexplicably drawn to trivia:
- the Bureau must be identified as the source of the material and a prominent link included to the Bureau web page from which the material was sourced
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- all text or graphical re-presentation of forecasts must include the issue time and date and the validity of the period and must precisely reproduce any warnings associated with the material
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You may be able to recognise Australia on here. Antarctica shouldn’t be too difficult either but South America and Africa are not that obvious. This is because of map projection. It is difficult to portray a 3d image on a 2d medium. How much more so an hemi-sphere. Even the circular rings that are the inner isobars of Cyclones and Anticyclones will have distortion, until fairly near the centre of the picture. (Making it difficult to identify elongation.)
But no matter, it isn’t necessary. It isn’t even necessary to know what a cyclone is or an anticyclone. It’s possible to use this chart to forecast Tropical Storm behaviour along with the likelihood of earthquakes and the rest of it, without knowing anything much about meteorology.
(That’s what I do. (I have learned a bit along the way but it all turned out to be incidental. (but interesting.)))
The chart itself is made up of yellow concentric rings in 10 degree intervals; the lines of latitude. They go out from 80 degrees (around the centre) to 20 degrees (which you can identify from the bottom of the page in the above instance.) At the bottom right is a section of the arc for latitude 10 degrees south.
The straight yellow lines, cutting the chart into segments, are lines of longitude. These are set out in 20 degree intervals, which are named (around the outside of the graphic.) The Greenwich Meridian is at the middle of the left hand side, the “date line on the right”.
Life would have been simpler all around had the powers that be drawn maps with lines of longitude over 360 degrees all around, not the 180 degrees here and 180 degrees there that we are stuck with now. (The damned fools couldn’t even agree on the date line! But at least they had the sense to put us right in the middle; the way god intended all along.)
And now for the full monty:
The above is an animation of the whole run as presented at the time I downloaded them on the 27th. I worked it in GIMP, a free graphics tool from the GNU project. I ought to credit them but I am getting bored with this and want to see how well it does with my efforts so far.
(Plus, I want to post this page’s address into my first post on this subject.)