thank you, rbkwp for these informations about the southern hemisphere summer in australia...
the australia map you posted has been very helpful to me to better imagine and possibly understand the possible flows running in the atmosphere around ths island/continent...
moreover... it helped me to make a very interesting intellectual exercise... as I am not used to think about the winds streamlines in the southern hemisphere...
so thank you again... lol
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I don't know exactly what information the colors refer to... even if I suppose it must be bound to temperatures or heat features visualization...
based on this... the dissymetry you showed on your posts between the eastern and western parts of the continent are indeed quite impressive...
I had no idea that eastern australia could be so much hotter than western australia in summer... as I was naively and primarily thinking that the temperatures field must have been less contrasted through the whole area...
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to the north of the continent... I think that the pale green area depicts the presence of tropical to equatorial moist or very moist airmasses... wet tropics as mentioned by halcyondays...
I suppose that those deep tropics airmasses generally linger near the northern edges of the continent all year long...
and during summer... they must have a tendency to go farther northward in a southerly to southwesterly monsoonal flow bringing showers all along the northern coastal areas for the least...
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now... the yellow/orange/red colors inland... beneath the southern tropic of capricorn... depict the tremendous heating from the sunlight... which must considerably expand the australian airmasses upward and toward both the adjacent oceans of the continent...
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it seems to me that such a phenomenon is responsible for the african easterly jet during the northern hemisphere summer... as considerable expanded... heated and dusty airmasses from the sahara and sahel areas invade the entire tropical atlantic ocean...
on the indian side of africa... another easterly jet also exists... the tropical easterly jet... but its mechanisms are somewhat different from the african easterly jet... as this indian flow occurs at higher levels than the atlantic flow... and I have iller-defined ideas about it...
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now... it would be interesting if I tried to find out if such streams occur on the pacific and indian oceans because of the heating of australia...
rbkwp... you already told about the size of australia... that you considered relatively less extended comparatively to the other continents...
nevertheless... australia might be as large as the other land areas in the southern hemisphere... as most of the african lands... and a non negligeable portion of southern america... must be north of the equator... I have to watch a map of the world to get more certainty about this point...
for this reason... I think that australia can produce similar middle and possibly upper level flows as those observed around africa in the northern hemisphere...
I think that these flows... interacting with the trade winds beneath... could have an effect on tropical cyclones formation too...
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the dark green areas along the southern australian coast could depict... I think... the mid latitude westerlies influence...
therefore... I suppose that these westerlies are responsible for the rain in the southwest... and that their weakness to the southeast may explain a little the dry and hot weather there...
but it could be a more tropical internal cause too for this latter pattern... like a kind of multi-annual cycle
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of course... I think to el niño... as... if I remember well... when el niño is strong... dry and hot airmasses are above australia and indonesia too...
but I don't know what is el niño phase currently...
thanks again rbkwp... and thank you halcyondays for the temperature you gave...