The first day in a run of charts that will develop a system for forecasting a period of heightened volcanic eruptions.
Something of a test since I am having difficulty posting a Gimp animation on here. I’m not happy about the colours but I am too cheap to get a decent graphic manipulation programme.
So now to tell you what this shows:
The centre of the chart is Antarctica the outer square shows the longitudes in 20 degree intervals and the concentric rings are the latitudes in 10 degree intervals.
The wiggly lines that change every chart are isobars, pressure lines. Most of the ones in the outer regions are Anticyclones or Highs. (Regions of High pressure.) They are semi-permanent and only rarely move from one ocean to the next. It takes them about 5 days to do so when that does occur. There equivalent in the northern hemisphere are the Bermuda/Azores High and the North Pacific High. I don’t know why that latter isn’t called the Hawaii High, it sounds the ideal, still beggars and all that…
Between the Highs and Antarctica a set of cyclones drift to the shore. More often than not they rotate some 120 degres around the planet before winding into the coast. Fed by the equatorial Warm Pool via the continents and sometimes directly from the oceans these cyclones can reach extraordinarily large dimensions as they do in this run.
If and when they darken significantly (with high water content) their behaviour indicated all manner of geo-phenomena. In this instance large cyclones have a Blocking Low effect (you will have to look that up at your leisure as there is so much else to tell you that isn’t in the text books (yet.))
In this chart the three darker masses move in synch for 54 hours ( to chart t+54) and then merge. The two on the left merge into one but all three bleed out into the lower pressure band outside their circle. The isobars form a band of parallel lines surrounding Antarctica.
These signal a period of increased tropical storm activity. These were Edna, Edsilon and Fobane. Not extremely strong storms and they don’t last all that long. The last chart in the run (T+150) looks similar to the first one (T+006) that was Kajiki.
The volcanic activity that occurs during such spells is related to these isobars in the degree of longitude covered and in the width(s) of the band(s).