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August position of the ITCZ and monsoon trough in the Pacific Ocean, depicted by area of convergent streamlines in the northern Pacific. The monsoon trough is a portion of the Intertropical Convergence Zone in the Western Pacific, [1] [2] as depicted by a line on a weather map showing the locations of minimum sea level pressure, [1] and as such, is a convergence zone between the wind patterns ...
Monsoon depressions and tropical cyclones form in the vicinity of the monsoon trough, with each capable of producing a year's worth of rainfall in a relatively short time frame. The migration of the monsoon trough into a landmass such Asia, Australia, North America , or across Africa heralds the beginning of their annual rainy season during ...
The South Pacific Convergence Zone (SPCZ), a reverse-oriented monsoon trough, is a band of low-level convergence, cloudiness and precipitation extending from the Western Pacific Warm Pool at the maritime continent south-eastwards towards French Polynesia and as far as the Cook Islands (160W, 20S).
By definition, the feature is a monsoon trough. [2] It is strongest in the warm season. Thunderstorm activity along the feature magnifies over three or more days when the Madden–Julian oscillation passes into the region, due to the enhanced upper divergence.
However, the monsoon is not a simple response to heating but a more complex interaction of topography, wind and sea, as demonstrated by its abrupt rather than gradual withdrawal from the region. The Australian monsoon (the "Wet") occurs in the southern summer when the monsoon trough develops over Northern Australia. Over three-quarters of ...
Monsoon is a season when summer rain is more prevalent, usually from mid-June to September. Here's what causes the drenching storms.
The Australian monsoon can also have a high influence on rainfall on the southeastern seaboard during the warmer months, such as in southeast Queensland and as well as the northern half of New South Wales (Northern Rivers to metropolitan Sydney), where summer is the wettest season and winter is the driest (the precipitation contrast between the ...
The monsoon trough can reach as far north as the 40th parallel in East Asia during August before moving southward thereafter. Its poleward progression is accelerated by the onset of the summer monsoon which is characterized by the development of lower air pressure (a thermal low) over the warmest part of Asia.