The Australian Bureau of Meteorology

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.

Image

http://www.bom.gov.au/australia/charts/viewer/index.shtml?type=mslp-precip&tz=UTC&area=SH&model=G&chartSubmit=Refresh+View

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’s default terms of use

Where no terms of use are associated with a set of material, then you may download, use and copy that material for personal use, or use within your organisation but you may not supply that material to any other person or use it for any commercial purpose. Any use under these default terms must comply with the following:

  • 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
  • any copyright statement or logo included on, or in connection with, a set of material must be retained
  • 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

Where an Open Access Licence does not apply, or you wish to use the material outside of the Bureau’s default terms of use, you must apply for a Bureau Access Agreement.

Please note that there may be different or additional conditions associated with some of the available material. Be sure to check the licensing information for each set of material you wish to use which may require you to contact the original copyright owner for permission to use the material. Use of images (including satellite images) and the Commonwealth Coat of Arms are subject to the terms set out below. You may use also use any material in accordance with rights you have under the Copyright Act 1968 (for example under the fair dealing provisions or statutory licences).

Use of images

Unless otherwise stated, all images (including background images, icons and illustrations) on Bureau websites are copyright of their owners and you must obtain the permission of those owners to use such images.

The satellite images available via the Bureau websites are obtained from non-Bureau sources. Please see Acknowledgements below for the attributions that you must apply when using satellite images.

http://reg.bom.gov.au/other/copyright.shtml

Access Agreement

SAMPLE ONLY

Between
COMMONWEALTH OF AUSTRALIA, acting through the Bureau of Meteorology (the “Bureau”)
and
the User

1

Grant and Scope of Licence

1.1

The Bureau grants the User, in respect to the Information made available by the Bureau to the User through any means, a non-transferable, non-exclusive licence to:

a)

use, copy and modify the information provided, with the exception of modification of warnings or hazardous weather notifications which includes all warnings, watches, advices, advisories, alerts, hazard or hazardous conditions, and

b)

supply the Information to third parties where it is incorporated as part of a User product,

on the terms and conditions set out in this Agreement.

1.2
The User must not supply the Information to third parties as is, except as incorporated into a User product. Where a third party requests direct access to the Information itself, the User must instead advise the third party to contact the Bureau for the purpose of organising that third party’s own Access Agreement.
1.3

The Information which the Bureau may make available under this Agreement may change at any time at the discretion of the Bureau with notice to the User.

http://reg.bom.gov.au/other/accagr1.shtml

Image

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:

Image

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.)

More later.

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